HYDRIL CO
S-1, EX-10.4, 2000-06-09
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<PAGE>   1
                                                                    EXHIBIT 10.4


================================================================================

                                 HYDRIL COMPANY

                             -----------------------
                             NOTE PURCHASE AGREEMENT
                             -----------------------

                            DATED AS OF JUNE 25, 1998

            $60,000,000 6.85% SENIOR SECURED NOTES DUE JUNE 30, 2003

================================================================================


<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                             PAGE
<S>                                                                          <C>
1.   AUTHORIZATION OF NOTES .................................................   1

2.   SALE AND PURCHASE OF NOTES .............................................   1

3.   CLOSING ................................................................   2

4.   CONDITIONS TO CLOSING ..................................................   2
     4.1  Representations and Warranties ....................................   2
     4.2  Performance; No Default ...........................................   2
     4.3  Compliance Certificates ...........................................   2
     4.4  Opinions of Counsel ...............................................   3
     4.5  Purchase Permitted By Applicable Law, etc. ........................   3
     4.6  Sale of Other Notes ...............................................   3
     4.7  Payment of Special Counsel Fees ...................................   3
     4.8  Private Placement Number ..........................................   3
     4.9  Changes in Corporate Structure ....................................   4
     4.10 Intercreditor Agreement ...........................................   4
     4.11 Collateral ........................................................   4
     4.12 Bank Agreement ....................................................   4
     4.13 Proceedings and Documents .........................................   4

5.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY ..........................   5
     5.1  Organization; Power and Authority .................................   5
     5.2  Authorization, etc. ...............................................   5
     5.3  Disclosure ........................................................   5
     5.4  Organization and Ownership of Shares of Subsidiaries; Affiliates ..   6
     5.5  Financial Statements ..............................................   6
     5.6  Compliance with Laws, Other Instruments, etc. .....................   6
     5.7  Governmental Authorizations, etc. .................................   7
     5.8  Litigation; Observance of Agreements, Statutes and Orders .........   7
     5.9  Taxes .............................................................   7
     5.10 Title to Property; Leases .........................................   8
     5.11 Licenses, Permits; etc. ...........................................   8
     5.12 Compliance with ERISA .............................................   9
     5.13 Private Offering by the Company ...................................  10
     5.14 Use of Proceeds; Margin Regulations ...............................  10
     5.15 Existing Debt; Future Liens .......................................  10
     5.16 Foreign Assets Control Regulations, etc. ..........................  11
     5.17 Status under Certain Statutes .....................................  11
     5.18 Environmental Matters .............................................  11
     5.19 Labor Relations ...................................................  12

6.   REPRESENTATIONS OF THE PURCHASER........................................  12
     6.1 Purchase for Investment ............................................  12
     6.2 Source of Funds ....................................................  12
</TABLE>


HYDRIL COMPANY                        i                 NOTE PURCHASE AGREEMENT
<PAGE>   3

                            TABLE OF CONTENTS (CONT.)

<TABLE>
<CAPTION>
                                                                            PAGE
<S>                                                                         <C>
7.   INFORMATION AS TO COMPANY ............................................   14
     7.1   Financial and Business Information .............................   14
     7.2   Officer's Certificate ..........................................   17
     7.3   Inspection .....................................................   17

8.   PAYMENT OF THE NOTES .................................................   18
     8.1   Payment at Maturity ............................................   18
     8.2   Optional Prepayments with Make-Whole Amount ....................   18
     8.3   Change in Control ..............................................   18
     8.4   Allocation of Partial Prepayments ..............................   19
     8.5   Maturity; Surrender, etc. ......................................   20
     8.6   No Other Optional Prepayments or Purchase of Notes..............   20
     8.7   Make-Whole Amount ..............................................   20

9.   AFFIRMATIVE COVENANTS ................................................   22
     9.1   Compliance with Law ............................................   22
     9.2   Insurance ......................................................   22
     9.3   Maintenance of Properties ......................................   22
     9.4   Payment of Taxes and Claims ....................................   22
     9.5   Corporate Existence, etc. ......................................   23
     9.6   Further Assurances .............................................   23
     9.7   Maintenance of Most Favored Lender Status ......................   23
     9.8   Subsidiary Guaranties ..........................................   24

10.  NEGATIVE COVENANTS ...................................................   24
     10.1  Consolidated Funded Debt .......................................   24
     10.2  Subsidiary Debt ................................................   25
     10.3  Tangible Net Worth .............................................   26
     10.4  Liens ..........................................................   26
     10.5  Restricted Investments and Restricted Payments .................   29
     10.6  Merger, Consolidation, etc. ....................................   30
     10.7  Disposition of Assets ..........................................   31
     10.8  Transactions with Affiliates ...................................   33
     10.9  Line of Business ...............................................   33
     10.10 EVI Indebtedness ...............................................   33

11.  EVENTS OF DEFAULT ....................................................   34

12.  REMEDIES ON DEFAULT, ETC. ............................................   37
     12.1  Acceleration ...................................................   37
     12.2  Other Remedies .................................................   37
     12.3  Rescission .....................................................   37
     12.4  No Waivers or Election of Remedies, Expenses, etc. .............   38
</TABLE>


HYDRIL COMPANY                        ii                NOTE PURCHASE AGREEMENT
<PAGE>   4

                            TABLE OF CONTENTS (CONT.)

<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<C>                                                                        <S>
13.  REGISTRATION; EXCHANGE; SUBSTITUTION OF NOTES .......................   38
     13.1  Registration of Notes .........................................   38
     13.2  Transfer and Exchange of Notes ................................   38
     13.3  Replacement of Notes ..........................................   39

14.  PAYMENTS ON NOTES ...................................................   39
     14.1  Place of Payment ..............................................   39
     14.2  Home Office Payment ...........................................   39

15.  EXPENSES, ETC. ......................................................   40
     15.1  Transaction Expenses ..........................................   40
     15.2  Survival ......................................................   40

16.  SURVIVAL OF REPRESENTATIONS AND WARRANTIES; ENTIRE
     AGREEMENT ...........................................................   41

17.  AMENDMENT AND WAIVER ................................................   41
     17.1  Requirements ..................................................   41
     17.2  Solicitation of Holders of Notes ..............................   41
     17.3  Binding Effect, etc. ..........................................   42
     17.4  Notes held by Company, etc. ...................................   42

18.  NOTICES .............................................................   42

19.  REPRODUCTION OF DOCUMENTS ...........................................   42

20.  CONFIDENTIAL INFORMATION ............................................   43

21.  SUBSTITUTION OF PURCHASER ...........................................   44

22.  MISCELLANEOUS .......................................................   45
     22.1  Successors and Assigns ........................................   45
     22.2  Payments Due on Non-Business Days; When Payments Deemed
           Received ......................................................   45
     22.3  Maximum Interest Payable ......................................   45
     22.4  Release of Liens ..............................................   46
     22.5  Severability ..................................................   46
     22.6  Construction ..................................................   46
     22.7  Counterparts ..................................................   46
     22.8  Governing Law .................................................   46
     22.9  Consent to Jurisdiction; etc. .................................   46
     22.10 Section Headings and Table of Contents ........................   47
</TABLE>


HYDRIL COMPANY                       iii                NOTE PURCHASE AGREEMENT
<PAGE>   5

                            TABLE OF CONTENTS (cont.)

<TABLE>
<CAPTION>
                                                                                                 PAGE
                                                                                                 ----
<S>                           <C>       <C>
        SCHEDULE A            --        Information Relating to Purchasers

        SCHEDULE B            --        Defined Terms

        SCHEDULE 3            --        Payment Instructions

        SCHEDULE 4.9          --        Changes in Corporate Structure

        SCHEDULE 4.11         --        Collateral Documents

        SCHEDULE 5.3          --        Disclosure Materials

        SCHEDULE 5.4          --        Subsidiaries of the Company and Ownership of
                                        Subsidiary Stock

        SCHEDULE 5.5          --        Financial Statements

        SCHEDULE 5.8          --        Certain Litigation

        SCHEDULE 5.11         --        Patents, etc.

        SCHEDULE 5.12         --        ERISA Affiliates

        SCHEDULE 5.14         --        Use of Proceeds

        SCHEDULE 5.15         --        Existing Debt and Liens

        SCHEDULE 5.19         --        Collective Bargaining Agreements

        SCHEDULE 10.5         --        Existing Investments

        SCHEDULE 10.8         --        Permitted Transactions with Affiliates

        EXHIBIT 1             --        Form of Note

        EXHIBIT 4.4(a)        --        Form of Opinion of Special Counsel for the Company

        EXHIBIT 4.4(b)        --        Form of Opinion of Special Counsel for the Purchasers

        EXHIBIT 4.10          --        Form of Intercreditor Agreement
</TABLE>

HYDRIL COMPANY                       iv                 NOTE PURCHASE AGREEMENT

<PAGE>   6

                                 HYDRIL COMPANY
                       3300 NORTH SAM HOUSTON PARKWAY EAST
                            HOUSTON, TEXAS 77032-3411

                  6.85% SENIOR SECURED NOTES DUE JUNE 30, 2003

                                                       Dated as of June 25, 1998

To the Purchaser Named on
the Signature Page Hereto


Ladies and Gentlemen:

     HYDRIL COMPANY, a Delaware corporation (together with its successors and
assigns, the "COMPANY"), agrees with you as follows:

1. AUTHORIZATION OF NOTES.

     The Company will authorize the issue and sale of $60,000,000 aggregate
principal amount of its 6.85% Senior Secured Notes due June 30, 2003 (the
"NOTES", such term to include any such notes issued in substitution therefor
pursuant to Section 13 of this Agreement or the Other Agreements (as hereinafter
defined)). The Notes shall be substantially in the form set out in Exhibit 1.
Certain capitalized terms used in this Agreement are defined in Schedule B;
references to a "Schedule" or an "Exhibit" are, unless otherwise specified, to a
Schedule or an Exhibit attached to this Agreement.

2. SALE AND PURCHASE OF NOTES.

     Subject to the terms and conditions of this Agreement, the Company will
issue and sell to you and you will purchase from the Company, at the Closing
provided for in Section 3, Notes in the principal amount specified below your
name in Schedule A at the purchase price of 100% of the principal amount
thereof. Contemporaneously with entering into this Agreement, the Company is
entering into separate Note Purchase Agreements (the "OTHER AGREEMENTS")
identical with this Agreement with each of the other purchasers named in
Schedule A (the "OTHER PURCHASERS"), providing for the sale at such Closing to
each of the Other Purchasers of Notes in the principal amount specified below
its name in Schedule A. Your obligation hereunder and the obligations of the
Other Purchasers under the Other Agreements are several and not joint
obligations and you shall have no obligation under any Other Agreement and no
liability to any Person for the performance or non-performance by any Other
Purchaser thereunder.

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT

<PAGE>   7

3. CLOSING.

     The sale and purchase of the Notes to be purchased by you and the Other
Purchasers shall occur at the offices of Andrews & Kurth L.L.P., 600 Travis,
Houston, Texas 77002, at 10:00 a.m., local time, at a closing (the "CLOSING") on
June 26, 1998 or on such other Business Day thereafter on or prior to June 30,
1998 as may be agreed upon by the Company and you and the Other Purchasers. At
the Closing the Company will deliver to you the Notes to be purchased by you in
the form of a single Note (or such greater number of Notes in denominations of
at least $100,000 as you may request), dated the date of the Closing and
registered in your name (or in the name of your nominee), as indicated in
Schedule A, against payment by federal funds wire transfer in immediately
available funds of the amount of the purchase price therefor as directed by the
Company in Schedule 3. If at the Closing the Company shall fail to tender such
Notes to you as provided above in this Section 3, or any of the conditions
specified in Section 4 shall not have been fulfilled to your satisfaction, you
shall, at your election, be relieved of all further obligations under this
Agreement, without thereby waiving any rights you may have by reason of such
failure or such nonfulfillment.

4. CONDITIONS TO CLOSING.

     Your obligation to purchase and pay for the Notes to be sold to you at the
Closing is subject to the fulfillment to your satisfaction, prior to or at the
Closing, of the following conditions:

     4.1 REPRESENTATIONS AND WARRANTIES.

     The representations and warranties of the Company in this Agreement shall
be correct when made and at the time of the Closing.

     4.2 PERFORMANCE; NO DEFAULT.

     The Company shall have performed and complied with all agreements and
conditions contained in this Agreement required to be performed or complied with
by it prior to or at the Closing and after giving effect to the issue and sale
of the Notes (and the application of the proceeds thereof as contemplated by
Schedule 5.14) no Default or Event of Default shall have occurred and be
continuing. Except as shall be described in Schedule 5.3, neither the Company
nor any Subsidiary shall have entered into any transaction since the date of the
Memorandum that would have been prohibited by Section 10 had such Section
applied since such date.

     4.3 COMPLIANCE CERTIFICATES.

          (a) OFFICER'S CERTIFICATE. The Company shall have delivered to you an
     Officer's Certificate, dated the date of the Closing, certifying that the
     conditions specified in Sections 4.1, 4.2 and 4.9 have been fulfilled.

          (b) SECRETARY'S CERTIFICATE. The Company shall have delivered to you a
     certificate of its Secretary or one of its Assistant Secretaries, dated
     the date of the Closing, certifying as to the resolutions attached thereto
     and other corporate proceedings relating to the authorization, execution
     and delivery of the Financing Documents to which it is a party.


HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       2

<PAGE>   8

     4.4 OPINIONS OF COUNSEL.

     You shall have received opinions in form and substance satisfactory to you,
dated the date of the Closing, from

          (a) Baker & Botts, counsel for the Company, substantially in the form
     set out in Exhibit 4.4(a), and covering such other matters incident to the
     transactions contemplated hereby as you or your counsel may reasonably
     request (and the Company hereby instructs such counsel to deliver such
     opinion to you), and

          (b) Hebb & Gitlin, your special counsel in connection with such
     transactions, substantially in the form set out in Exhibit 4.4(b), and
     covering such other matters incident to such transactions as you may
     reasonably request.

     4.5 PURCHASE PERMITTED BY APPLICABLE LAW, ETC.

     On the date of the Closing your purchase of Notes shall (a) be permitted by
the laws and regulations of each jurisdiction to which you are subject, without
recourse to provisions (such as section 1405(a)(8) of the New York Insurance
Law) permitting limited investments by insurance companies without restriction
as to the character of the particular investment, (b) not violate any applicable
law or regulation (including, without limitation, Regulation T, U or X of the
Board of Governors of the Federal Reserve System) and (c) not subject you to any
tax, penalty or liability under or pursuant to any applicable law or regulation.
If requested by you, you shall have received an Officer's Certificate certifying
as to such matters of fact as you may reasonably specify to enable you to
determine whether such purchase is so permitted.

     4.6 SALE OF OTHER NOTES.

     Contemporaneously with the Closing the Company shall sell to the Other
Purchasers and the Other Purchasers shall purchase the Notes to be purchased by
them at the Closing as specified in Schedule A.

     4.7 PAYMENT OF SPECIAL COUNSEL FEES.

     Without limiting the provisions of Section 15.1, the Company shall have
paid on or before the Closing the reasonable fees, charges and disbursements of
your special counsel referred to in Section 4.4(b) to the extent reflected in a
statement of such counsel rendered to the Company on or prior to the date of the
Closing.

     4.8 PRIVATE PLACEMENT NUMBER.

     A Private Placement Number issued by Standard & Poor's CUSIP Service Bureau
(in cooperation with the Securities Valuation Office of the National Association
of Insurance Commissioners) shall have been obtained for the Notes.



HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       3

<PAGE>   9

     4.9 CHANGES IN CORPORATE STRUCTURE.

     Except as specified in Schedule 4.9, the Company shall not have changed its
jurisdiction of incorporation or been a party to any merger or consolidation and
shall not have succeeded to all or any substantial part of the liabilities of
any other entity, at any time following the date of the most recent financial
statements referred to in Schedule 5.5.

     4.10 INTERCREDITOR AGREEMENT.

     An intercreditor and collateral agency agreement substantially in the form
of Exhibit 4.10 (as amended from time to time, the "INTERCREDITOR AGREEMENT")
shall have been duly executed and delivered by you, each of the Other
Purchasers, the Banks, Bank One, as agent for the Banks, and the Collateral
Agent, and an original copy thereof evidencing such due execution and delivery
shall be delivered to you.

     4.11 COLLATERAL.

     The Company and the Collateral Agent shall have entered into the Second
Lien Deed of Trust and Security Agreements identified on Schedule 4.11
(collectively, the "DEEDS OF TRUST") and amendments to or assignments of the
documents set forth on Schedule 4.11 (such documents, including the Deeds of
Trust and any other security agreement, pledge agreement, collateral assignment,
mortgage or other instrument or agreement relating to the Collateral, whether
existing on or entered into after the date of Closing, as so amended or
assigned, and as may be further amended, modified or restated from time to time,
collectively, the "COLLATERAL DOCUMENTS"), in form and substance satisfactory to
you, and copies thereof shall be delivered to you, certified as true and correct
by the Company.

     4.12 BANK AGREEMENT.

     The Company shall have delivered to you a fully executed copy of the Bank
Agreement as in effect on, and as amended as of, the date of Closing, certified
as true, complete and correct by a Responsible Officer of the Company, and such
agreement shall be in form and substance reasonably satisfactory to you.

     4.13 PROCEEDINGS AND DOCUMENTS.

     All corporate and other proceedings in connection with the transactions
contemplated by this Agreement and all documents and instruments incident to
such transactions shall be satisfactory to you and your special counsel, and you
and your special counsel shall have received all such counterpart originals or
certified or other copies of such documents as you or they may reasonably
request.


HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       4

<PAGE>   10

5. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

     The Company represents and warrants to you, as of the date of the Closing,
that:

     5.1 ORGANIZATION; POWER AND AUTHORITY.

     The Company is a corporation duly organized, validly existing and in good
standing under the laws of its jurisdiction of incorporation, and is duly
qualified as a foreign corporation and is in good standing in each jurisdiction
in which such qualification is required by law, other than those jurisdictions
as to which the failure to be so qualified or in good standing could not,
individually or in the aggregate, reasonably be expected to have a Material
Adverse Effect. The Company has the corporate power and authority, to own or
hold under lease the Properties it purports to own or hold under lease, to
transact the business it transacts and proposes to transact, to execute and
deliver the Financing Documents to which it is a party and to perform the
provisions thereof.

     5.2 AUTHORIZATION, ETC.

     Each of the Financing Documents has been duly authorized by all necessary
corporate action on the part of the Company, and constitutes the legal, valid
and binding obligation of the Company enforceable against the Company in
accordance with its terms, except as such enforceability may be limited by (a)
applicable bankruptcy, insolvency, reorganization, moratorium or other similar
laws affecting the enforcement of creditors' rights generally and (b) general
principles of equity (regardless of whether such enforceability is considered in
a proceeding in equity or at law).

     5.3 DISCLOSURE.

     The Company, through its agent, Dain Rauscher Wessels, a division of Dain
Rauscher Incorporated, has delivered to you and each Other Purchaser a copy of a
Confidential Private Placement Memorandum, dated May 1998 (the "MEMORANDUM"),
relating to the transactions contemplated hereby. The Memorandum fairly
describes, in all material respects, the general nature of the business and
principal Properties of the Company and its Subsidiaries. Except as disclosed in
Schedule 5.3, this Agreement, the memorandum, the documents, certificates or
other writings delivered to you by or on behalf of the Company in connection
with the transactions contemplated hereby and the financial statements listed in
Schedule 5.5, taken as a whole, do not contain any untrue statement of a
material fact or omit to state any material fact necessary to make the
statements therein not misleading in light of the circumstances under which they
were made. Except as disclosed in the Memorandum or as expressly described in
Schedule 5.3, or in one of the documents, certificates or other writings
identified therein, or in the financial statements listed in Schedule 5.5, since
December 31, 1997, there has been no change in the financial condition,
operations, business, Properties or prospects of the Company or any Subsidiary
except changes that individually or in the aggregate could not reasonably be
expected to have a Material Adverse Effect. There is no fact known to the
Company that could reasonably be expected to have a Material Adverse Effect that
has not been set forth herein or in the Memorandum or in the other documents,
certificates and other writings delivered to you by or on behalf of the Company
specifically for use in connection with the transactions contemplated hereby.



HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       5

<PAGE>   11

     5.4 ORGANIZATION AND OWNERSHIP OF SHARES OF SUBSIDIARIES; AFFILIATES.

          (a) Schedule 5.4 contains (except as noted therein) complete and
     correct lists of the Company's Subsidiaries, showing, as to each
     Subsidiary, the correct name thereof, the jurisdiction of its organization,
     and the percentage of shares of each class of its Capital Stock outstanding
     owned by the Company and each other Subsidiary. The Company has no
     Affiliates other than trusts and charitable organizations, none of which is
     engaged in any operating business.

          (b) All of the outstanding shares of Capital Stock of each Subsidiary
     shown in Schedule 5.4 as being owned by the Company and its Subsidiaries
     have been validly issued, are fully paid and nonassessable and are owned
     by the Company or another Subsidiary free and clear of any Lien (except as
     otherwise disclosed in Schedule 5.4).

          (c) Each Subsidiary identified in Schedule 5.4 is a corporation or
     other legal entity duly organized, validly existing and in good standing
     under the laws of its jurisdiction of organization, and is duly qualified
     as a foreign corporatIon or other legal entity and is in good standing in
     each jurisdiction in which such qualification is required by law, other
     than those jurisdictions as to which the failure to be so qualified or in
     good standing could not, individually or in the aggregate, reasonably be
     expected to have a Material Adverse Effect. Each such Subsidiary has the
     corporate or other power and authority to own or hold under lease the
     Properties it purports to own or hold under lease and to transact the
     business it transacts and proposes to transact.

          (d) No Subsidiary is a party to, or otherwise subject to any legal
     restriction or any agreement (other than this Agreement, the agreements
     listed in Schedule 5.4 and customary limitations imposed by corporate law
     statutes) restricting the ability of such Subsidiary to pay dividends out
     of profits or make any other similar distributions of profits to the
     Company or any of its Subsidiaries that owns outstanding shares of Capital
     Stock of such Subsidiary.

     5.5 FINANCIAL STATEMENTS.

     The Company has delivered to you and each Other Purchaser copies of the
financial statements of the Company and its Subsidiaries listed in Schedule 5.5.
All of said financial statements (including in each case the related schedules
and notes) fairly present in all material respects the consolidated financial
position of the Company and its Subsidiaries as of the respective dates
specified in such Schedule and the consolidated results of their operations and
cash flows for the respective periods so specified and have been prepared in
accordance with GAAP consistently applied throughout the periods involved except
as set forth in the notes thereto (subject, in the case of any interim financial
statements, to normal year-end adjustments and the inclusion of abbreviated
footnotes).

     5.6 COMPLIANCE WITH LAWS, OTHER INSTRUMENTS, ETC.

     The execution, delivery and performance by the Company of this Agreement,
the Notes and the other Financing Documents will not

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       6

<PAGE>   12


          (a) contravene, result in any breach of, or constitute a default
     under, or result in the creation of any Lien (other than Liens on the
     Collateral in favor of the Collateral Agent) in respect of any Property of
     the Company or any Subsidiary under, any indenture, mortgage, deed of
     trust, loan, purchase or credit agreement, lease, corporate charter or
     by-laws, or any other agreement or instrument to which the Company or any
     Subsidiary is bound or by which the Company or any Subsidiary or any of
     their respective Properties may be bound or affected,

          (b) conflict with or result in a breach of any of the terms,
     conditions or provisions of any order, judgment, decree, or ruling of any
     court, arbitrator or Governmental Authority applicable to the Company or
     any Subsidiary, or

          (c) violate any provision of any statute or other rule or regulation
     of any Governmental Authority applicable to the Company or any Subsidiary.

     5.7 GOVERNMENTAL AUTHORIZATIONS, ETC.

     No consent, approval or authorization of, or registration, filing or
declaration with, any Governmental Authority is required in connection with the
execution, delivery or performance by the Company of the Financing Documents.

     5.8 LITIGATION; OBSERVANCE OF AGREEMENTS, STATUTES AND ORDERS.

          (a) Except as disclosed in Schedule 5.8, there are no actions, suits
     or proceedings pending or, to the knowledge of the Company, threatened
     against or affecting the Company or any Subsidiary or any Property of the
     Company or any Subsidiary in any court or before any arbitrator of any kind
     or before or by any Governmental Authority that, individually or in the
     aggregate, could reasonably be expected to have a Material Adverse Effect.

          (b) Neither the Company nor any Subsidiary is in default under any
     term of any agreement or instrument to which it is a party or by which it
     is bound, or any order, judgment, decree or ruling of any court, arbitrator
     or Governmental Authority or is in violation of any applicable law,
     ordinance, rule or regulation (including, without limitation, Environmental
     Laws) of any Governmental Authority, which default or violation,
     individually or in the aggregate, could reasonably be expected to have a
     Material Adverse Effect.

     5.9 TAXES.

     The Company and its Subsidiaries have filed all tax returns that are
required to have been filed in any jurisdiction, and have paid all taxes shown
to be due and payable on such returns and all other taxes and assessments levied
upon them or their Properties, assets, income or franchises, to the extent such
taxes and assessments have become due and payable and before they have become
delinquent, except for any taxes and assessments (a) the amount of which is not
individually or in the aggregate Material or (b) the amount, applicability or
validity of which is currently being contested in good faith by appropriate
proceedings and with respect to which the Company or a Subsidiary, as the case
may be, has established adequate reserves in accordance with GAAP. The Company
knows of no basis for any other tax or assessment that could reasonably be
expected to have a Material Adverse Effect. The charges, accruals and

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       7

<PAGE>   13

reserves on the books of the Company and its Subsidiaries in respect of Federal,
state or other taxes for all fiscal periods are adequate. The Federal income tax
liabilities of the Company and its Subsidiaries have been determined by the
Internal Revenue Service and paid for all fiscal years up to and including the
fiscal year ended December 31, 1993.

     5.10 TITLE TO PROPERTY; LEASES.

     The Company and its Subsidiaries have good and sufficient title to their
respective Properties that individually or in the aggregate are Material,
including all such Properties reflected in the most recent audited balance sheet
referred to in Section 5.5 or purported to have been acquired by the Company or
any Subsidiary after said date (except as sold or otherwise disposed of in the
ordinary course of business), in each case free and clear of Liens prohibited by
this Agreement. All leases that individually or in the aggregate are Material
are valid and subsisting and are in full force and effect in all material
respects.

     5.11 LICENSES, PERMITS, ETC.

     Except as disclosed in Schedule 5.11,

          (a) the Company and its Subsidiaries own or possess all licenses,
     permits, franchises, authorizations, patents, copyrights, service marks,
     trademarks and trade names, or rights thereto, without known conflict with
     the rights of others, unless the failure to have such ownership or
     possession could not reasonably be expected to result in a Material Adverse
     Effect;

          (b) to the best knowledge of the Company, no product or practice of
     the Company or any Subsidiary infringes in any respect any license, permit,
     franchise, authorization, patent, copyright, service mark, trademark, trade
     name or other right owned by any other Person, unless such infringement
     could not reasonably be expected to result in a Material Adverse Effect;

          (c) to the best knowledge of the Company, there is no violation by any
     Person of any right of the Company or any of its Subsidiaries with respect
     to any patent, copyright, service mark, trademark, trade name or other
     right owned or used by the Company or any of its Subsidiaries, which
     violation could reasonably be expected to result in a Material Adverse
     Effect;

          (d) all filings in federal and state offices (including, without
     limitation, the United States Patent and Trademark Office) in respect of
     all Material patents, pending patents, copyrights, service marks,
     trademarks and trade names, and licenses with respect thereto, necessary to
     protect the rights therein of the Company and its Subsidiaries against
     third parties, have been made; and

          (e) Schedule 5.11 correctly lists all United States patents and
     trademarks (including those pending) held by the Company and its
     Subsidiaries.

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       8

<PAGE>   14

     5.12 COMPLIANCE WITH ERISA.

          (a) COMPLIANCE WITH LAW. The Company and each ERISA Affiliate have
     operated and administered each Plan in compliance with all applicable laws
     except for such instances of noncompliance as have not resulted in and
     could not reasonably be expected to result in a Material Adverse Effect.
     Neither the Company nor any ERISA Affiliate has incurred any liability
     pursuant to Title I or IV of ERISA or the penalty or excise tax provisions
     of the Code relating to employee benefit plans (as defined in section 3 of
     ERISA), and no event, transaction or condition has occurred or exists that
     could reasonably be expected to result in the incurrence of any such
     liability by the Company or any ERISA Affiliate, or in the imposition of
     any Lien on any of the rights, Properties or assets of the Company or any
     ERISA Affiliate, in either case pursuant to Title I or IV of ERISA or to
     such penalty or excise tax provisions or to section 401(a)(29) or 412 of
     the Code, other than such liabilities or Liens as would not reasonably be
     expected, individually or in the aggregate, to have a Material Adverse
     Effect.

          (b) BENEFIT LIABILITIES. The present value of the aggregate benefit
     liabilities under each of the Plans (other than Multiemployer Plans),
     determined as of the end of such Plan's most recently ended plan year on
     the basis of the actuarial assumptions specified for funding purposes in
     such Plan's most recent actuarial valuation report, did not exceed the
     aggregate current value of the assets of such Plan allocable to such
     benefit liabilities by more than $4,800,000. The term "BENEFIT LIABILITIES"
     has the meaning specified in section 4001 of ERISA and the terms "CURRENT
     VALUE" and "PRESENT VALUE" have the meaning specified in section 3 of
     ERISA.

          (c) MULTIEMPLOYER WITHDRAWAL LIABILITIES. The Company and the ERISA
     Affiliates have not incurred withdrawal liabilities (and are not subject to
     contingent withdrawal liabilities) under section 4201 or 4204 of ERISA in
     respect of Multiemployer Plans that individually or in the aggregate are
     Material.

          (d) POSTRETIREMENT BENEFITS. The expected postretirement benefit
     obligation (determined as of the last day of the Company's most recently
     ended fiscal year in accordance with Financial Accounting Standards Board
     Statement No. 106, without regard to liabilities attributable to
     continuation coverage mandated by section 4980B of the Code) of the Company
     and its Subsidiaries could not reasonably be expected to have a Material
     Adverse Effect.

          (e) PROHIBITED TRANSACTIONS. The execution and delivery of this
     Agreement and the issuance and sale of the Notes hereunder will not involve
     any transaction that is subject to the prohibitions of section 406 of ERISA
     or in connection with which a tax could be imposed pursuant to section
     4975(c)(1)(A)-(D) of the Code. The representation by the Company in the
     first sentence of this Section 5.12(e) is made in reliance upon and subject
     to the accuracy of your representation in Section 6.2 as to the Sources
     used to pay the purchase price of the Notes to be purchased by you.

          (f) PLANS. Schedule 5.12 sets forth all ERISA Affiliates and all
     "employee benefit plans" maintained by the Company (or any "affiliate"
     thereof) or in respect of which the Notes could constitute an "employer
     security" ("EMPLOYEE BENEFIT PLAN" has the meaning specified in section 3
     of ERISA, "AFFILIATE" has the meaning specified in section

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       9

<PAGE>   15

     407(d) of ERISA and section V of the Department of Labor Prohibited
     Transaction Exemption 95-60 (60 FR 35925, July 12, 1995) and "EMPLOYER
     SECURITY" has the meaning specified in section 407(d) of ERISA).

          (g) FOREIGN PENSION PLANS. All Foreign Pension Plans have been
     established, operated, administered and maintained in compliance with all
     laws, regulations and orders applicable thereto except for such failures,
     in the aggregate for all such failures, to comply that could not reasonably
     be expected to have a Material Adverse Effect. All premiums, contributions
     and any other amounts required by applicable Foreign Pension Plan documents
     or applicable laws have been paid or accrued as required, except for
     premiums, contributions and amounts that, in the aggregate for all such
     obligations, could not reasonably be expected to have a Material Adverse
     Effect. The present value of all benefits vested under each Foreign Pension
     Plan, determined as of the most recent valuation date in respect thereof
     does not exceed the value of the assets of such Foreign Pension Plan, and
     all required payments in respect of funding such Foreign Pension Plan have
     been made, unless any such excess or the failure to make any such payments
     could not reasonably be expected to have a Material Adverse Effect.

     5.13 PRIVATE OFFERING BY THE COMPANY.

     Neither the Company nor anyone acting on its behalf has offered the Notes
or any similar securities for sale to, or solicited any offer to buy any of the
same from, or otherwise approached or negotiated in respect thereof with, any
Person other than you, the Other Purchasers and not more than 30 other
Institutional Investors, each of which has been offered the Notes at a private
sale for investment. Neither the Company nor anyone acting on its behalf has
taken, or will take, any action that would subject the issuance or sale of the
Notes to the registration requirements of section 5 of the Securities Act.

     5.14 USE OF PROCEEDS; MARGIN REGULATIONS.

     The Company will apply the proceeds of the sale of the Notes as set forth
in Schedule 5.14. No part of the proceeds from the sale of the Notes hereunder
will be used, directly or indirectly, for the purpose of buying or carrying any
margin stock within the meaning of Regulation U of the Board of Governors of the
Federal Reserve System (12 CFR 221), or for the purpose of buying or carrying or
trading in any securities under such circumstances as to involve the Company in
a violation of Regulation X of said Board (12 CFR 224) or to involve any broker
or dealer in a violation of Regulation T of said Board (12 CFR 220). Margin
stock does not constitute more than 1% of the value of the consolidated assets
of the Company and its Subsidiaries and the Company does not have any present
intention that margin stock will constitute more than 1% of the value of such
assets. As used in this Section, the terms "MARGIN STOCK" and "PURPOSE OF BUYING
OR CARRYING" shall have the meanings assigned to them in said Regulation U.

     5.15 EXISTING DEBT; FUTURE LIENS.

          (a) Except as described therein, Schedule 5.15 sets forth a complete
     and correct list of all outstanding Debt of the Company and its
     Subsidiaries, with a principal amount in excess of $500,000, as of May 31,
     1998 (and specifying, as to each such Debt, the collateral, if any,
     securing such Debt), since which date there has been no Material

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       10

<PAGE>   16

     change in the amounts, interest rates, sinking funds, instalment payments
     or maturities of the Debt of the Company or its Subsidiaries. Neither the
     Company nor any Subsidiary is in default and no waiver of default is
     currently in effect, in the payment of any principal or interest on any
     Debt of the Company or such Subsidiary and no event or condition exists
     with respect to any Debt of the Company or any Subsidiary that would permit
     (or that with notice or the lapse of time, or both, would permit) one or
     more Persons to cause such Debt to become due and payable before its stated
     maturity or before its regularly scheduled dates of payment.

          (b) Except as disclosed in Schedule 5.15, neither the Company nor any
     Subsidiary has agreed or consented to cause or permit in the future (upon
     the happening of a contingency or otherwise) any of its Property, whether
     now owned or hereafter acquired, to be subject to a Lien not permitted by
     Section 10.4.

          (c) No Subsidiary has given any Guaranty of any obligations owing by
     the Company under the Bank Agreement.

     5.16 FOREIGN ASSETS CONTROL REGULATIONS, ETC.

     Neither the sale of the Notes by the Company hereunder nor its use of the
proceeds thereof will violate the Trading with the Enemy Act, as amended, or any
of the foreign assets control regulations of the United States Treasury
Department (31 CFR, Subtitle B, Chapter V, as amended) or any enabling
legislation or executive order relating thereto.

     5.17 STATUS UNDER CERTAIN STATUTES.

     Neither the Company nor any Subsidiary is subject to regulation under the
Investment Company Act of 1940, as amended, the Public Utility Holding Company
Act of 1935, as amended, the Transportation Acts (49 U.S.C.), as amended, or the
Federal Power Act, as amended.

     5.18 ENVIRONMENTAL MATTERS.

     Neither the Company nor any Subsidiary has knowledge of any claim or has
received any notice of any claim, and no proceeding has been instituted raising
any claim against the Company or any of its Subsidiaries or any of their
respective real Properties or other assets now or formerly owned, leased or
operated by any of them, alleging any damage to the environment or violation of
any Environmental Laws, except, in each case, such as could not reasonably be
expected to result in a Material Adverse Effect. Except as otherwise disclosed
to you in writing,

          (a) neither the Company nor any Subsidiary has knowledge of any facts
     which would give rise to any claim, public or private, of violation of
     Environmental Laws or damage to the environment emanating from, occurring
     on or in any way related to real Properties now or formerly owned, leased
     or operated by any of them or to other assets or their use, except, in each
     case, such as could not reasonably be expected to result in a Material
     Adverse Effect;

          (b) neither the Company nor any of its Subsidiaries has stored any
     Hazardous Materials on real Properties now or formerly owned, leased or
     operated by any of them

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       11

<PAGE>   17

     or disposed of any Hazardous Materials in a manner contrary to any
     Environmental Laws in each case in any manner that could reasonably be
     expected to result in a Material Adverse Effect; and

          (c) all buildings on all real Properties now owned, leased or operated
     by the Company or any of its Subsidiaries are in compliance with applicable
     Environmental Laws, except where failure to comply could not reasonably be
     expected to result in a Material Adverse Effect.

     5.19 LABOR RELATIONS.

     Except as set forth on Schedule 5.19, neither the Company nor any
Subsidiary is a party to any collective bargaining agreement. There are no
grievances, disputes or controversies with any union or other organization
affecting the Company or any Subsidiary that could, individually or in the
aggregate, be expected to have a Material Adverse Effect.

6. REPRESENTATIONS OF THE PURCHASER.

     6.1 PURCHASE FOR INVESTMENT.

     You represent that you are purchasing the Notes for your own account or for
one or more separate accounts maintained by you or for the account of one or
more pension or trust funds and not with a view to the distribution thereof,
provided that the disposition of your or their Property shall at all times be
within your or their control. You understand that the Notes have not been
registered under the Securities Act and may be resold only if registered
pursuant to the provisions of the Securities Act or if an exemption from
registration is available, except under circumstances where neither such
registration nor such an exemption is required by law, and that the Company is
not required to register the Notes.

     6.2 SOURCE OF FUNDS.

     You represent that at least one of the following statements is an accurate
representation as to each source of funds (a "SOURCE") to be used by you to pay
the purchase price of the Notes to be purchased by you hereunder:

          (a) the Source is an "insurance company general account" as defined
     in United States Department of Labor Prohibited Transaction Exemption
     ("PTE") 95-60 (60 FR 35925, July 12, 1995) and in respect thereof you
     represent that there is no "employee benefit plan" (as defined in section
     3(3) of ERISA and section 4975(e)(1) of the Code, treating as a single plan
     all plans maintained by the same employer or employee organization or
     affiliate thereof) with respect to which the amount of the general account
     reserves and liabilities of all contracts held by or on behalf of such plan
     exceeds 10% of the total reserves and liabilities of such general account
     (exclusive of separate account liabilities) plus surplus, as set forth in
     the National Association of Insurance Commissioners' Annual Statement filed
     with your state of domicile and that such acquisition is eligible for and
     satisfies the other requirements of such exemption; or

          (b) if you are an insurance company, the Source does not include
     assets allocated to any separate account maintained by you in which any
     employee benefit plan

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       12

<PAGE>   18

     (or its related trust) has any interest, other than a separate account that
     is maintained solely in connection with your fixed contractual obligations
     under which the amounts payable, or credited, to such plan and to any
     participant or beneficiary of such plan (including any annuitant) are not
     affected in any manner by the investment performance of the separate
     account; or

          (c) the Source is either (i) an insurance company pooled separate
     account, within the meaning of PTE 90-1 (issued January 29, 1990), or (ii)
     a bank collective investment fund, within the meaning of the PTE 91-38
     (issued July 12,1991) and, except as you have disclosed to the Company in
     writing pursuant to this clause (c), no employee benefit plan or group of
     plans maintained by the same employer or employee organization beneficially
     owns more than 10% of all assets allocated to such pooled separate account
     or collective investment fund; or

          (d) the Source constitutes assets of an "investment fund" (within the
     meaning of part V of PTE 84-14 (the "QPAM EXEMPTION")) managed by a
     "qualified professional asset manager" or "QPAM" (within the meaning of
     part V of the QPAM Exemption), no employee benefit plan's assets that are
     included in such investment fund, when combined with the assets of all
     other employee benefit plans established or maintained by the same employer
     or by an affiliate (within the meaning of section V(c)(1) of the QPAM
     Exemption) of such employer or by the same employee organization and
     managed by such QPAM, exceed 20% of the total client assets managed by such
     QPAM, the conditions of part I(c) and (g) of the QPAM Exemption are
     satisfied, neither the QPAM nor a person controlling or controlled by the
     QPAM (applying the definition of "control" in section V(e) of the QPAM
     Exemption) owns a 5% or more interest in the Company and

               (i)  the identity of such QPAM and

               (ii) the names of all employee benefit plans whose assets are
          included in such investment fund

     have been disclosed to the Company in writing pursuant to this clause (d);
     or

          (e) the Source is a governmental plan; or

          (f) the Source is one or more employee benefit plans, or a separate
     account or trust fund comprised of one or more employee benefit plans, each
     of which has been identified to the Company in writing pursuant to this
     clause (f); or

          (g) the Source does not include assets of any employee benefit plan,
     other than a plan exempt from the coverage of ERISA.

As used in this Section 6.2, the terms "EMPLOYEE BENEFIT PLAN", "GOVERNMENTAL
PLAN" and "SEPARATE ACCOUNT" shall have the respective meanings assigned to such
terms in section 3 of ERISA.

HYDRIL COMPANY                                          NOTE PURCHASE AGREEMENT
                                       13

<PAGE>   19

7.       INFORMATION AS TO COMPANY.

         7.1      FINANCIAL AND BUSINESS INFORMATION.

         The Company shall deliver to each holder of Notes that is an
Institutional Investor:

                  (a) QUARTERLY STATEMENTS -- within 45 days after the end of
         each quarterly fiscal period in each fiscal year of the Company (other
         than the last quarterly fiscal period of each such fiscal year),
         duplicate copies of,

                           (i) a consolidated balance sheet of the Company and
                  its Subsidiaries as at the end of such quarter, and

                           (ii) consolidated statements of income and cash flows
                  of the Company and its Subsidiaries, for such quarter and (in
                  the case of the second and third quarters) for the portion of
                  the fiscal year ending with such quarter,

         setting forth in each case in comparative form the figures for the
         corresponding periods in the previous fiscal year, all in reasonable
         detail, prepared in accordance with GAAP applicable to quarterly
         financial statements generally, and certified by a Senior Financial
         Officer as fairly presenting, in all material respects, the
         consolidated financial position of the companies being reported on and
         their consolidated results of operations and cash flows, subject to
         changes resulting from year-end adjustments;

                  (b) ANNUAL STATEMENTS -- within 120 days after the end of each
         fiscal year of the Company, duplicate copies of,

                           (i) a consolidated balance sheet of the Company and
                  its Subsidiaries, as at the end of such year, and

                           (ii) consolidated statements of income, shareholders'
                  equity and cash flows of the Company and its Subsidiaries, for
                  such year,

         setting forth in each case in comparative form the figures for the
         previous fiscal year, all in reasonable detail, prepared in accordance
         with GAAP, and accompanied by

                                    (A) an opinion thereon of independent
                           certified public accountants of recognized national
                           standing, which opinion shall state that such
                           financial statements present fairly, in all material
                           respects, the consolidated financial position of the
                           companies being reported upon and their consolidated
                           results of operations and cash flows and have been
                           prepared in conformity with GAAP, and that the
                           examination of such accountants in connection with
                           such financial statements has been made in accordance
                           with generally accepted auditing standards, and that
                           such audit provides a reasonable basis for such
                           opinion in the circumstances, and

                                    (B) a report of such accountants stating
                           whether, in making their audit, they have become
                           aware of any condition or event that then


HYDRIL COMPANY                         14                NOTE PURCHASE AGREEMENT
<PAGE>   20


                           constitutes a Default or an Event of Default, and, if
                           they are aware that any such condition or event then
                           exists, specifying the nature and period of the
                           existence thereof (it being understood that such
                           accountants shall not be liable, directly or
                           indirectly, for any failure to obtain knowledge of
                           any Default or Event of Default unless such
                           accountants should have obtained knowledge thereof in
                           making an audit in accordance with generally accepted
                           auditing standards or did not make such an audit);

                  (c) SEC AND OTHER REPORTS -- promptly upon their becoming
         available, one copy of (i) each financial statement, report (including,
         without limitation, the Company's annual report to shareholders, if
         any, prepared pursuant to Rule 14a-3 under the Exchange Act), notice
         or proxy statement sent by the Company or any Subsidiary to public
         securities holders generally, and (ii) each regular or periodic report,
         each registration statement (without exhibits except as expressly
         requested by such holder), and each prospectus and all amendments
         thereto filed by the Company or any Subsidiary with the Securities and
         Exchange Commission and of all press releases and other statements made
         available generally by the Company or any Subsidiary to the public
         concerning developments that are Material;

                  (d) NOTICE OF DEFAULT OR EVENT OF DEFAULT -- promptly, and in
         any event within five Business Days after a Responsible Officer
         becoming aware

                           (i) of the existence of any Default or Event of
                  Default, or

                           (ii) that any Person has given any notice or taken
                  any action with respect to a claimed default hereunder, or

                           (iii) that any Person has given any notice or taken
                  any action with respect to a claimed default under the Bank
                  Agreement, or

                           (iv) that any Person has given any notice or taken
                  any action with respect to a claimed default of the type
                  referred to in Section 11(f),

         a written notice specifying the nature, the period of existence thereof
         and what action the Company is taking or proposes to take with respect
         thereto;

                  (e) ERISA MATTERS -- promptly, and in any event within five
         days after a Responsible Officer becoming aware of any of the
         following, a written notice setting forth the nature thereof and the
         action, if any, that the Company or an ERISA Affiliate proposes to take
         with respect thereto:

                           (i) with respect to any Plan, any reportable event,
                  as defined in section 4043(c) of ERISA and the regulations
                  thereunder, for which notice thereof has not been waived
                  pursuant to such regulations as in effect on the date of the
                  Closing; or

                           (ii) the taking by the PBGC of steps to institute, or
                  the threatening by the PBGC of the institution of, proceedings
                  under section 4042 of ERISA for the termination of, or the
                  appointment of a trustee to administer, any Plan, or the


HYDRIL COMPANY                         15                NOTE PURCHASE AGREEMENT
<PAGE>   21

                  receipt by the Company or any ERISA Affiliate of a notice from
                  a Multiemployer Plan that such action has been taken by the
                  PBGC with respect to such Multiemployer Plan;

                           (iii) any event, transaction or condition that could
                  result in the incurrence of any liability by the Company or
                  any ERISA Affiliate pursuant to Title I or IV of ERISA or the
                  penalty or excise tax provisions of the Code relating to
                  employee benefit plans, or in the imposition of any Lien on
                  any of the rights, Properties or assets of the Company or any
                  ERISA Affiliate pursuant to Title I or IV of ERISA or such
                  penalty or excise tax provisions, if such liability or Lien,
                  taken together with any other such liabilities or Liens then
                  existing, could reasonably be expected to have a Material
                  Adverse Effect; or

                           (iv) any material contributions to any Foreign
                  Pension Plan have not been made when due and such default
                  cannot immediately be remedied, or any Foreign Pension Plan is
                  not funded to the extent required by applicable law, based
                  upon reasonable actuarial assumptions, or any material change
                  is anticipated to any Foreign Pension Plan, except for changes
                  that individually or in the aggregate could not reasonably be
                  expected to have a Material Adverse Effect;

                  (f) NOTICES FROM GOVERNMENTAL AUTHORITY -- promptly, and in
         any event within 30 days of receipt thereof, copies of any notice to
         the Company or any Subsidiary from any Federal or state Governmental
         Authority relating to any order, ruling, statute or other law or
         regulation that could reasonably be expected to have a Material Adverse
         Effect;

                  (g) ACTIONS, PROCEEDINGS -- promptly after a Responsible
         Officer becomes aware of the commencement thereof, notice of any action
         or proceeding relating to the Company or any Subsidiary in any court or
         before any Governmental Authority or arbitration board or tribunal as
         to which there is a reasonable possibility of an adverse determination
         and that, if adversely determined, could reasonably be expected to have
         a Material Adverse Effect;

                  (h) OTHER CREDITORS -- as soon as practicable, copies of any
         financial statements, projections or reports (other than routine
         notices, communications or other documents delivered in connection with
         ordinary course borrowing, or the administration of any borrowing base
         or similar test for ordinary course advances under a credit agreement)
         furnished to any Bank (or its agent) pursuant to the Bank Agreement to
         the extent that the information contained in such statement, report or
         certificate has not already been delivered to each holder of Notes;

                  (i) RULE 144A -- with reasonable promptness, such information
         regarding the Company as may from time to time be required to satisfy
         the requirements of 17 C.F.R. Section 230.144A, as amended, in
         connection with any contemplated transfer of the Notes; and

                  (j) REQUESTED INFORMATION -- with reasonable promptness, such
         other data and information relating to the business, operations,
         financial condition, assets or Properties of the Company or any of its
         Subsidiaries or relating to the ability of the


HYDRIL COMPANY                         16                NOTE PURCHASE AGREEMENT
<PAGE>   22

         Company to perform its obligations hereunder and under the Notes as
         from time to time may be reasonably requested by any such holder of
         Notes.

         7.2      OFFICER'S CERTIFICATE.

         Each set of financial statements delivered to a holder of Notes
pursuant to Section 7.1(a) or Section 7.1(b) hereof shall be accompanied by a
certificate of a Senior Financial Officer setting forth:

                  (a) COVENANT COMPLIANCE -- the information (including detailed
         calculations) required in order to establish whether the Company was in
         compliance with the requirements of Sections 10.1 through 10.7,
         inclusive, during the quarterly or annual period covered by the
         statements then being furnished (including with respect to each such
         Section, where applicable, the calculations of the maximum or minimum
         amount, ratio or percentage, as the case may be, permissible under the
         terms of such Sections, and the calculation of the amount, ratio or
         percentage then in existence); and

                  (b) EVENT OF DEFAULT -- a statement that such officer has
         reviewed the relevant terms hereof and has made, or caused to be made,
         under his or her supervision, a review of the transactions and
         conditions of the Company and its Subsidiaries from the beginning of
         the quarterly or annual period covered by the statements then being
         furnished to the date of the certificate and that such review has not
         disclosed the existence during such period of any condition or event
         that constitutes a Default or an Event of Default or, if any such
         condition or event existed or exists (including, without limitation,
         any such event or condition resulting from the failure of the Company
         or any Subsidiary to comply with any Environmental Law), specifying the
         nature and period of existence thereof and what action the Company
         shall have taken or proposes to take with respect thereto.

         7.3      INSPECTION.

         The Company shall permit the representatives of each holder of Notes
that is an Institutional Investor:

                  (a) NO DEFAULT -- if no Default or Event of Default then
         exists, at the expense of such holder and upon reasonable prior notice
         to the Company, to visit the principal executive office of the Company,
         to discuss the affairs, finances and accounts of the Company and its
         Subsidiaries with the Company's officers, and (with the consent of the
         Company, which consent will not be unreasonably withheld) its
         independent public accountants, and (with the consent of the Company,
         which consent will not be unreasonably withheld) to visit the other
         offices and Properties of the Company and each Subsidiary, all at such
         reasonable times and as often as may be reasonably requested in
         writing, provided that an officer of the Company shall be entitled to
         be present during any such visit; and

                  (b) DEFAULT -- if a Default or Event of Default then exists,
         at the expense of the Company, to visit and inspect any of the offices
         or Properties of the Company or any Subsidiary, to examine all their
         respective books of account, records, reports and other papers, to make
         copies and extracts therefrom, and to discuss their respective affairs,


HYDRIL COMPANY                         17                NOTE PURCHASE AGREEMENT
<PAGE>   23


         finances and accounts with their respective officers and independent
         public accountants (and by this provision the Company authorizes said
         accountants to discuss the affairs, finances and accounts of the
         Company and its Subsidiaries), all at such times and as often as may be
         requested.

8.       PAYMENT OF THE NOTES.

         8.1      PAYMENT AT MATURITY.

         On June 30, 2003, the Company will pay $60,000,000 principal amount
(or such lesser principal amount as shall then be outstanding) of the Notes at
par and without payment of the Make-Whole Amount or any premium. Such payment
shall be made together with interest on the outstanding principal amount of the
Notes accrued to the date of such payment.

         8.2      OPTIONAL PREPAYMENTS WITH MAKE-WHOLE AMOUNT.

         The Company may, at its option, upon notice as provided below, prepay
at any time all, or from time to time any part of, the Notes (but if in part, in
an amount not less than $1,000,000 or such lesser amount as shall then be
outstanding), at 100% of the principal amount so prepaid, plus the Make-Whole
Amount determined for the prepayment date with respect to such principal amount.
The Company will give each holder of Notes written notice of each optional
prepayment under this Section 8.2 not less than 20 days and not more than 60
days prior to the date fixed for such prepayment. Each such notice shall specify

                  (a) the prepayment date,

                  (b) the aggregate principal amount of the Notes to be prepaid
         on such date,

                  (c) the principal amount of each Note held by such holder to
         be prepaid (determined in accordance with Section 8.4), and

                  (d) the interest to be paid on the prepayment date with
         respect to such principal amount being prepaid,

and shall be accompanied by a certificate of a Senior Financial Officer as to
the estimated Make-Whole Amount due in connection with such prepayment
(calculated as if the date of such notice were the date of the prepayment),
setting forth the details of such computation. Two Business Days prior to such
prepayment, the Company shall deliver to each holder of Notes a certificate of a
Senior Financial Officer specifying the calculation of such Make-Whole Amount as
of the specified prepayment date.

         8.3      CHANGE IN CONTROL.

                  (a) NOTICE OF CHANGE IN CONTROL OR CONTROL EVENT. The Company
         will, within 5 Business Days after any Responsible Officer has
         knowledge of the occurrence of any Change in Control or Control Event,
         give written notice of such Change in Control or Control Event to each
         holder of Notes. In the case that a Change in Control has occurred,
         such notice shall contain and constitute an offer to prepay Notes as
         described


HYDRIL COMPANY                         18                NOTE PURCHASE AGREEMENT
<PAGE>   24


         in clause (b) of this Section 8.3 and shall be accompanied by the
         certificate described in clause (e) of this Section 8.3.

                  (b) OFFER TO PREPAY NOTES. The offer to prepay Notes
         contemplated by clause (a) of this Section 8.3 shall be an offer to
         prepay, in accordance with and subject to this Section 8.3, all, but
         not less than all, the Notes held by each holder (in this case only,
         "holders" in respect of any Note registered in the name of a nominee
         for a disclosed beneficial owner shall mean such beneficial owner) on a
         date specified in such offer (the "PROPOSED PREPAYMENT DATE") that is
         not less than 30 days and not more than 45 days after the date of such
         offer (if the Proposed Prepayment Date shall not be specified in such
         offer, the Proposed Prepayment Date shall be the 45th day after the
         date of such offer).

                  (c) ACCEPTANCE; REJECTION. A holder of Notes may accept the
         offer to prepay made pursuant to this Section 8.3 by causing a notice
         of such acceptance to be delivered to the Company at least five days
         prior to the Proposed Prepayment Date. A failure by a holder of Notes
         to respond to an offer to prepay made pursuant to this Section 8.3
         shall be deemed to constitute a rejection of such offer by such holder.

                  (d) PREPAYMENT. Prepayment of the Notes to be prepaid pursuant
         to this Section 8.3 shall be at 100% of the principal amount of such
         Notes, plus the Make-Whole Amount determined for the date of prepayment
         with respect to such principal amount, together with interest on such
         Notes accrued to the date of prepayment. On the Business Day preceding
         the date of prepayment, the Company shall deliver to each holder of
         Notes being prepaid a statement showing the Make-Whole Amount due in
         connection with such prepayment and setting forth the details of the
         computation of such amount. The prepayment shall be made on the
         Proposed Prepayment Date.

                  (e) OFFICER'S CERTIFICATE. Each offer to prepay the Notes
         pursuant to this Section 8.3 shall be accompanied by a certificate,
         executed by a Senior Financial Officer of the Company and dated the
         date of such offer, specifying: (i) the Proposed Prepayment Date; (ii)
         that such offer is made pursuant to this Section 8.3; (iii) the
         principal amount of each Note offered to be prepaid; (iv) the estimated
         Make-Whole Amount due in connection with such prepayment (calculated as
         if the date of such notice were the date of the prepayment), setting
         forth the details of such computation; (v) the interest that would be
         due on each Note offered to be prepaid, accrued to the Proposed
         Prepayment Date; (vi) that the conditions of this Section 8.3 have been
         fulfilled; and (vii) in reasonable detail, the nature and date of the
         Change in Control.

         8.4      ALLOCATION OF PARTIAL PREPAYMENTS.

         In the case of each partial prepayment of the Notes pursuant to Section
8.2, the principal amount of the Notes to be prepaid shall be allocated among
all of the Notes at the time outstanding in proportion, as nearly as
practicable, to the respective unpaid principal amounts thereof not theretofore
called for prepayment.


HYDRIL COMPANY                         19                NOTE PURCHASE AGREEMENT
<PAGE>   25

         8.5      MATURITY; SURRENDER, ETC.

         In the case of each prepayment of Notes pursuant to this Section 8, the
principal amount of each Note to be prepaid shall mature and become due and
payable on the date fixed for such prepayment, together with interest on such
principal amount accrued to such date and the applicable Make-Whole Amount, if
any. From and after such date, unless the Company shall fail to pay such
principal amount when so due and payable, together with the interest and
Make-Whole Amount, if any, as aforesaid, interest on such principal amount shall
cease to accrue. Any Note paid or prepaid in full shall be surrendered to the
Company and cancelled and shall not be reissued, and no Note shall be issued in
lieu of any prepaid principal amount of any Note.

         8.6      NO OTHER OPTIONAL PREPAYMENTS OR PURCHASE OF NOTES.

         The Company will not prepay (whether directly or indirectly by
purchase, redemption or other acquisition) any of the outstanding Notes except
upon the payment or prepayment of the Notes in accordance with the terms of this
Section 8. The Company will promptly cancel all Notes acquired by it or any
Affiliate, and no Notes may be issued in substitution or exchange for any such
Notes.

         8.7      MAKE-WHOLE AMOUNT.

         The term "MAKE-WHOLE AMOUNT" means, with respect to any Note, an amount
equal to the excess, if any, of the Discounted Value of the Remaining Scheduled
Payments with respect to the Called Principal of such Note over the amount of
such Called Principal, provided that the Make-Whole Amount may in no event be
less than zero. For the purposes of determining the Make-Whole Amount, the
following terms have the following meanings:

                  "CALLED PRINCIPAL" means, with respect to any Note, the
         principal of such Note that is to be prepaid pursuant to Section 8.2 or
         Section 8.3 or has become or is declared to be immediately due and
         payable pursuant to Section 12.1, as the context requires.

                  "DISCOUNTED VALUE" means, with respect to the Called Principal
         of any Note, the amount obtained by discounting all Remaining Scheduled
         Payments with respect to such Called Principal from their respective
         scheduled due dates to the Settlement Date with respect to such Called
         Principal, in accordance with accepted financial practice and at a
         discount factor (applied on the same periodic basis as that on which
         interest on the Notes is payable) equal to the Reinvestment Yield with
         respect to such Called Principal.

                  "REINVESTMENT YIELD" means, with respect to the Called
         Principal of any Note, 0.50% over the yield to maturity implied by

                           (i) the yields reported, as of 10:00 A.M. (New York
                  City time) on the second Business Day preceding the Settlement
                  Date with respect to such Called Principal, on the display
                  designated as "Page 678" on the Dow Jones Markets Service (or
                  such other display as may replace Page 678 on the Dow Jones
                  Markets Service) for actively traded U.S. Treasury securities
                  having a maturity equal to the Remaining Average Life of such
                  Called Principal as of such Settlement Date, or


HYDRIL COMPANY                         20                NOTE PURCHASE AGREEMENT
<PAGE>   26


                           (ii) if such yields are not reported as of such time
                  or the yields reported as of such time are not ascertainable,
                  the Treasury Constant Maturity Series Yields reported, for the
                  latest day for which such yields have been so reported as of
                  the second Business Day preceding the Settlement Date with
                  respect to such Called Principal, in Federal Reserve
                  Statistical Release H.15 (519) (or any comparable successor
                  publication) for activity traded U.S. Treasury securities
                  having a constant maturity equal to the Remaining Average Life
                  of such Called Principal as of such Settlement Date.

         Such implied yield will be determined, if necessary, by (a) converting
         U.S. Treasury bill quotations to bond-equivalent yields in accordance
         with accepted financial practice and (b) interpolating linearly between
         (1) the actively traded U.S. Treasury security with the duration
         closest to and greater than the Remaining Average Life and (2) the
         actively traded U.S. Treasury security with the duration closest to and
         less than the Remaining Average Life.

                  "REMAINING AVERAGE LIFE" means, with respect to any Called
         Principal, the number of years (calculated to the nearest one-twelfth
         year) obtained by dividing

                           (i) such Called Principal into

                           (ii) the sum of the products obtained by multiplying

                                    (a) the principal component of each
                           Remaining Scheduled Payment with respect to such
                           Called Principal by

                                    (b) the number of years (calculated to the
                           nearest one-twelfth year) that will elapse between
                           the Settlement Date with respect to such Called
                           Principal and the scheduled due date of such
                           Remaining Scheduled Payment.

                  "REMAINING SCHEDULED PAYMENTS" means, with respect to the
         Called Principal of any Note, all payments of such Called Principal and
         interest thereon that would be due after the Settlement Date with
         respect to such Called Principal if no payment of such Called Principal
         were made prior to its scheduled due date, provided that if such
         Settlement Date is not a date on which interest payments are due to be
         made under the term of the Notes, then the amount of the next
         succeeding scheduled interest payment will be reduced by the amount of
         interest accrued to such Settlement Date and required to be paid on
         such Settlement Date pursuant to Section 8.2, Section 8.3 or 12.1.

                  "SETTLEMENT DATE" means, with respect to the Called Principal
         of any Note, the date on which such Called Principal is to be prepaid
         pursuant to Section 8.2 or Section 8.3 or has become or is declared to
         be immediately due and payable pursuant to Section 12.1, as the context
         requires.


HYDRIL COMPANY                         21                NOTE PURCHASE AGREEMENT
<PAGE>   27


9.       AFFIRMATIVE COVENANTS.

         The Company covenants that so long as any of the Notes are outstanding:

         9.1      COMPLIANCE WITH LAW.

         The Company will and will cause each of its Subsidiaries to comply with
all laws, ordinances or governmental rules or regulations to which each of them
is subject, and will obtain and maintain in effect all licenses, certificates,
permits, franchises and other governmental authorizations necessary to the
ownership of their respective Properties or to the conduct of their respective
businesses, in each case to the extent necessary to ensure that non-compliance
with such laws, ordinances or governmental rules or regulations or failures to
obtain or maintain in effect such licenses, certificates, permits, franchises
and other governmental authorizations could not, individually or in the
aggregate, reasonably be expected to have a Material Adverse Effect.

         9.2      INSURANCE.

         The Company will and will cause each of its Subsidiaries to maintain,
with financially sound and reputable insurers, insurance with respect to their
respective Properties and businesses against such casualties and contingencies,
of such types, on such terms and in such amounts (including deductibles,
co-insurance and self-insurance, if adequate reserves are maintained with
respect thereto) as is customary in the case of entities of established
reputations engaged in the same or a similar business and similarly situated.

         9.3      MAINTENANCE OF PROPERTIES.

         The Company will and will cause each of its Subsidiaries to maintain
and keep, or cause to be maintained and kept, their respective Properties in
good repair, working order and condition (other than ordinary wear and tear), so
that the business carried on in connection therewith may be properly conducted
at all times, provided that this Section shall not prevent the Company or any
Subsidiary from discontinuing the operation and the maintenance of any of its
Properties if such discontinuance is desirable in the conduct of its business
and the Company has concluded that such discontinuance could not, individually
or in the aggregate, reasonably be expected to have a Material Adverse Effect.

         9.4      PAYMENT OF TAXES AND CLAIMS.

         The Company will and will cause each of its Subsidiaries to

                  (a) file all tax returns required to be filed in any
         jurisdiction and to pay and discharge all taxes shown to be due and
         payable on such returns and all other taxes, assessments, governmental
         charges, or levies imposed on them or any of their Properties, assets,
         income or franchises, and

                  (b) pay all claims of materialmen, mechanics, carriers,
         warehousemen, vendors, landlords and other like Persons,

to the extent such taxes, assessments, charges, levies or claims have become due
and payable and before they have become delinquent or that have or might become
a Lien on Properties or



HYDRIL COMPANY                         22                NOTE PURCHASE AGREEMENT
<PAGE>   28


assets of the Company or any Subsidiary, provided that neither the Company nor
any Subsidiary need pay any such tax or assessment or claim if (i) the amount,
applicability or validity thereof is contested by the Company or such Subsidiary
on a timely basis in good faith and in appropriate proceedings, and the Company
or a Subsidiary has established adequate reserves therefor in accordance with
GAAP on the books of the Company or such Subsidiary or (ii) the nonpayment of
all such taxes, assessments, charges, levies and claims in the aggregate could
not reasonably be expected to have a Material Adverse Effect.

         9.5      CORPORATE EXISTENCE, ETC.

         The Company will at all times preserve and keep in full force and
effect its existence as a corporation organized under the laws of a State of the
United States of America. Subject to Sections 10.6 and 10.7, the Company will at
all times preserve and keep in full force and effect the corporate or other
existence of each of its Subsidiaries and all rights and franchises of the
Company and its Subsidiaries unless, in the good faith judgment of the Company,
the termination of or failure to preserve and keep in full force and effect such
existence, right or franchise could not, individually or in the aggregate, have
a Material Adverse Effect.

         9.6      FURTHER ASSURANCES.

                  (a) GENERALLY. The Company will, and will cause each
         Subsidiary to, execute and deliver, within 30 days after any request
         therefor by the Required Holders, all further instruments and documents
         and take all further action that may be necessary, in order to give
         effect to, and to aid in the exercise and enforcement of the Liens,
         rights and remedies of the holders of Notes under, the Financing
         Documents.

                  (b) LIENS. The Company will, and will cause each Subsidiary
         to, execute and deliver, within 30 days after any request therefor by
         the Required Holders, all further instruments and documents and take
         all further action that may be necessary, in order to create and
         perfect Liens in favor of the Collateral Agent in any Property of the
         Company or the Subsidiaries that is not then subject to, but under the
         Collateral Documents is intended to be subject to, a Lien or to a
         perfected Lien.

         9.7      MAINTENANCE OF MOST FAVORED LENDER STATUS.

         The Company and the holders of the Notes hereby acknowledge and agree
that if the Company shall enter into any amendment to the Bank Agreement that
provides for the benefit of the lenders thereunder any Financial Covenants that
are relatively more favorable to such lenders than the Financial Covenants that
are currently in effect pursuant to the Bank Agreement as compared to the
Financial Covenants set forth in this Agreement, then, and in each and any such
event, the Financial Covenants in this Agreement shall be and shall be deemed to
be, notwithstanding the provisions of Section 17 and without any further action
on the part of the Company or any other Person being necessary or required,
amended to afford the holders of Notes the same benefits and rights as such
amendment to, or other agreements in respect of, the Financial Covenants of the
Bank Agreement afforded to such lenders; provided, however, that if any such
amendment shall be modified or terminated, then the deemed amendment to this
Agreement effected by this Section 9.7 shall be deemed to have been
simultaneously modified (if any such modification of the Bank Agreement
amendment would itself require a deemed amendment pursuant to this Section 9.7)
or terminated (if such Bank Agreement amendment has


HYDRIL COMPANY                         23                NOTE PURCHASE AGREEMENT
<PAGE>   29


been terminated or if such modification of the Bank Agreement amendment would
not itself require a deemed amendment pursuant to this Section 9.7). (If such
deemed amendment shall be deemed to have been terminated, the relevant Financial
Covenant or Financial Covenants herein shall be deemed to provide as it or they
would have if such deemed amendment had never come into effect). The Company
will promptly deliver to each holder of the Notes a copy of each amendment or
other modification to or waiver of any provision of the Bank Agreement entered
into after the date of Closing. "FINANCIAL COVENANTS" means any covenant (or
substantially equivalent default provision) which requires the Company to attain
or maintain a prescribed level of financial condition or financial achievement,
including, without limitation, covenants of the type set forth in Section 10 of
this Agreement, but excluding provisions equivalent to Section 10.8 and Section
10.9, and any borrowing base or similar test for ordinary course advances under
the Bank Agreement.

         9.8      SUBSIDIARY GUARANTIES.

         If any Subsidiary shall give a Guaranty (a "BANK GUARANTY") of any
obligations owing by the Company under the Bank Agreement, the Company shall
take such action as shall be necessary so that such Subsidiary shall, within one
Business Day after giving a Bank Guaranty, give to each holder of Notes a
Guaranty of all obligations of the Company hereunder and under the Notes
containing substantially the same terms and conditions as the Bank Guaranty.

10.      NEGATIVE COVENANTS.

         The Company covenants that, on and after date of the Closing and so
long as any of the Notes are outstanding:

         10.1     CONSOLIDATED FUNDED DEBT.

         The Company will not, and will not permit any Subsidiary to, directly
or indirectly, create, incur, assume, guarantee, or otherwise become directly or
indirectly liable with respect to, any Funded Debt, other than Funded Debt of a
Subsidiary owing to the Company or another Subsidiary, other than:

                  (a) the Notes;

                  (b) Funded Debt outstanding on the date of the Closing and
         identified on Schedule 5.15;

                  (c) all Funded Debt available to be borrowed under the Bank
         Agreement, the UBS Facility and the Clydesdale Bank Facility, in each
         case, as in effect on the date of Closing; and

                  (d) renewals, extensions, substitutions, refinancings or
         replacements of any Funded Debt outstanding pursuant to the foregoing
         clauses (a) through (c), inclusive, provided that such renewals,
         extensions, substitutions, refinancings or replacements do not exceed
         the amount so renewed, extended, substituted, refinanced or replaced;

unless, immediately after giving effect to the creation, incurrence, assumption,
guarantee, or becoming liable in respect thereof and to the application of the
proceeds thereof,


HYDRIL COMPANY                         24                NOTE PURCHASE AGREEMENT

<PAGE>   30


                           (i) no Event of Default would exist;

                           (ii) Consolidated Funded Debt would not exceed 55% of
                  Consolidated Total Capitalization; and

                           (iii) the ratio of (a) Consolidated EBITDA for the
                  period of four full consecutive fiscal quarters of the Company
                  ending on, or most recently ended prior to, the date of such
                  creation, incurrence, assumption, guarantee, or becoming
                  liable, to (b) Consolidated Fixed Charges for such period
                  would be greater than 1.5 to 1.0.

For purposes of the foregoing clause (iii), Consolidated EBITDA and Consolidated
Fixed Charges shall be determined on the basis that

                  (x)      (I) such Funded Debt, together with all other Funded
                  Debt incurred during such four fiscal quarter period, was
                  incurred on the first day of such period,

                           (II) any Debt repaid with the proceeds of such Funded
                  Debt, or such other Funded Debt, was repaid on the first day
                  of such period, and

                           (III) the interest rate in effect for such Funded
                  Debt, and such other Funded Debt, on the date of incurrence
                  thereof was in effect at all times during such period, and
                  such Funded Debt, and such other Funded Debt, was outstanding
                  at all times during such period, and

                  (y) all acquisitions of Voting Stock or other equity interests
         of a Person sufficient to cause such Person to become a Subsidiary, and
         all acquisitions of all or substantially all of an operating unit of a
         business, in each case made by the Company or a Subsidiary during such
         period, occurred on the first day of such period.

Any such determination of Consolidated EBITDA and Consolidated Fixed Charges
shall be made in good faith and on a reasonable basis by a Responsible Officer.

         For the purposes of this Section 10.1 and Section 10.2, any Person
becoming a Subsidiary after the date hereof shall be deemed, at the time it
becomes a Subsidiary, to have incurred all of its then outstanding Debt, and any
Person extending, renewing or refunding any Debt shall be deemed to have
incurred such Debt at the time of such extension, renewal or refunding.

         10.2     SUBSIDIARY DEBT.

         The Company will not permit any Subsidiary to, directly or indirectly,
create, incur, assume, guarantee, or otherwise become directly or indirectly
liable with respect to, any Debt, other than Debt owing to the Company or
another Subsidiary, unless, immediately after giving effect thereto and to the
application of the proceeds thereof:

                  (a) no Event of Default would exist;

                  (b) such Debt would be incurred in compliance with Section
         10.1; and


HYDRIL COMPANY                         25                NOTE PURCHASE AGREEMENT

<PAGE>   31

                  (c) the sum of

                           (i) the aggregate Debt of all Subsidiaries (other
                  than Debt owing to the Company or other Subsidiaries) plus

                           (ii) the aggregate amount of obligations secured by
                  Liens permitted pursuant to Section 10.4(k) outstanding at
                  such time,

would not exceed 15% of Consolidated Tangible Net Worth at such time.

         10.3     TANGIBLE NET WORTH.

         The Company will not, at any time, permit Consolidated Tangible Net
Worth to be less than $75,000,000.

         10.4     LIENS.

         The Company will not, and will not permit any Subsidiary to, directly
or indirectly create, incur, assume or permit to exist (upon the happening of a
contingency or otherwise) any Lien on or with respect to any Property
(including, without limitation, any document or instrument in respect of goods
or accounts receivable) of the Company or any such Subsidiary, whether now owned
or held or hereafter acquired, or any income or profits therefrom (whether or
not provision is made for the equal and ratable securing of the Notes in
accordance with the last paragraph of this Section 10.4), or assign or otherwise
convey any right to receive income or profits, except:

                  (a) Liens securing Debt of the Company and the Subsidiaries
         outstanding on the date of the Closing and listed on Schedule 5.15;

                  (b) Liens renewing or replacing Liens then in existence and
         permitted by clause (a) of this Section 10.4 to the extent that the
         underlying obligations secured by such existing Liens are being
         extended, renewed or refunded, provided that

                           (i) no such renewal or replacement Lien shall extend
                  to any Property of the Company or any Subsidiary other than
                  Property already encumbered by the existing Lien being so
                  renewed or replaced,

                           (ii) the principal amount of the underlying
                  obligation secured by such existing Lien which could have been
                  outstanding at the time of such renewal or replacement shall
                  not be increased in connection with such renewal or
                  replacement, and

                           (iii) immediately prior to, and immediately after
                  giving effect to, such renewal or replacement, no Event of
                  Default exists or would exist;

                  (c) Liens (other than any Lien imposed by ERISA) incurred or
         deposits made in the ordinary course of business

                           (i) in connection with workers' compensation,
                  unemployment insurance and other types of social security or
                  retirement benefits, or


HYDRIL COMPANY                         26                NOTE PURCHASE AGREEMENT

<PAGE>   32

                           (ii) to secure (or to obtain letters of credit that
                  secure) the performance of tenders, statutory obligations,
                  surety bonds, bids, leases (other than Capital Leases),
                  performance bonds, purchase, construction or sales contracts
                  and other similar obligations,

         in each case not incurred or made in connection with the borrowing of
         money, the obtaining of advances or credit or the payment of the
         deferred purchase price of Property and which Liens, in the aggregate,
         do not materially affect the value of the Property of the Company or
         its Subsidiaries affected thereby and do not materially impair the use
         of such Property in the ordinary course of the business of the Company
         or any such Subsidiary;

                  (d) any Lien created to secure all or any part of the purchase
         price, or to secure Debt incurred or assumed to pay all or any part of
         the purchase price or cost of construction, of Property (or any
         improvement thereon) acquired or constructed by the Company or a
         Subsidiary after the date of the Closing, provided that

                           (i) any such Lien shall extend solely to the item or
                  items of such Property (or improvement thereon or proceeds
                  thereof) so acquired or constructed and, if required by the
                  terms of the instrument originally creating such Lien, other
                  Property (or improvement thereon or proceeds thereof) which is
                  an improvement to or is acquired for specific use in
                  connection with such acquired or constructed Property (or
                  improvement thereon or proceeds thereof) or which is real
                  Property being improved by such acquired or constructed
                  Property (or improvement thereon or proceeds thereof),

                           (ii) the principal amount of the Debt secured by any
                  such Lien shall at no time exceed an amount equal to 80% (or,
                  in the case of any such Debt which is a Capital Lease
                  Obligation, 100%) of the lesser of (A) the cost to the Company
                  or such Subsidiary of the Property (or improvement thereon) so
                  acquired or constructed and (B) the Fair Market Value (as
                  determined in good faith by the board of directors of the
                  Company or by a Senior Financial Officer acting pursuant to
                  delegated or standing authority granted by the board of
                  directors of the Company) of such Property (or improvement
                  thereon) at the time of such acquisition or construction, and

                           (iii) any such Lien shall be created
                  contemporaneously with, or within twelve months after, the
                  acquisition or construction of such Property;

                  (e) statutory Liens of landlords and Liens of carriers,
         warehousemen, mechanics, materialmen and, other similar Liens, in each
         case incurred in the ordinary course of business for sums not yet due
         and payable or the payment of which is not at the time required by
         Section 9.4;

                  (f) Liens arising from judicial attachments or judgments, or
         securing appeal bonds, and other similar Liens, provided that

                           (i) all claims secured thereby are no more than
                  $3,000,000 in the aggregate, or


HYDRIL COMPANY                         27                NOTE PURCHASE AGREEMENT

<PAGE>   33


                           (ii) the execution or other enforcement of such Liens
                  is effectively stayed and the claims secured thereby are being
                  actively contested in good faith and adequate reserves in
                  respect thereof have been established by the Company or such
                  Subsidiary in accordance with GAAP;

                  (g) leases or subleases granted to others, easements,
         rights-of-way, restrictions and other similar charges or encumbrances,
         in each case incidental to, and not interfering with, the ordinary
         conduct of the business of the Company or any of the Subsidiaries,
         provided that such Liens do not, in the aggregate, materially impair
         use by the Company or such Subsidiary of the Property affected thereby;

                  (h) Liens for taxes, assessments or other governmental charges
         which are not yet due and payable or the payment of which is not at the
         time required by Section 9.4;

                  (i) any Lien existing on Property of a Person immediately
         prior to its being consolidated with or merged into the Company or a
         Subsidiary, or any Lien existing on any Property acquired by the
         Company or any Subsidiary at the time such Property is so acquired
         (whether or not the Debt secured thereby shall have been assumed),
         provided that (i) no such Lien shall have been created or assumed in
         contemplation of such consolidation or merger or such acquisition of
         Property, and (ii) each such Lien shall extend solely to the item or
         items of Property so acquired;

                  (j) Liens on Property of a Subsidiary, provided that such
         Liens secure only Debt owing to the Company or a Subsidiary; and

                  (k) other Liens not otherwise permitted by clauses (a) through
         (j) of this Section 10.4, so long as immediately after giving effect to
         the creation thereof,

                           (i) the sum, without duplication, of

                                    (A) the aggregate amount of Debt secured by
                           such Liens, plus

                                    (B) the aggregate amount of Debt of all
                           Subsidiaries (other than any such Debt owing to the
                           Company or other Subsidiaries),

                  does not exceed 15% of Consolidated Tangible Net Worth,

                           (ii) no Event of Default would exist, and

                           (iii) the Company would be permitted by the
                  provisions of Section 10.1 to incur at least $1.00 of
                  additional Funded Debt (other than Funded Debt owing to a
                  Subsidiary or Funded Debt incurred pursuant to clauses (a)
                  through (d), inclusive, of Section 10.1).

         If, notwithstanding the prohibition contained herein, the Company
shall, or shall permit any of the Subsidiaries to, directly or indirectly
create, incur, assume or permit to exist any Lien, other than those Liens
permitted by the provisions of clauses (a) through (k) of this Section 10.4, the
Company will make or cause to be made effective provision whereby the Notes will
be secured equally and ratably with any and all other obligations thereby
secured, such security to be


HYDRIL COMPANY                         28                NOTE PURCHASE AGREEMENT

<PAGE>   34


pursuant to agreements reasonably satisfactory to the Required Holders and, in
any such case, the Notes shall have the benefit, to the fullest extent that, and
with such priority as, the holders of the Notes may be entitled under applicable
law, of an equitable Lien on the affected Property. Such violation of this
Section 10.4 will constitute an Event of Default, whether or not provision is
made for an equal and ratable Lien pursuant to this Section 10.4.

         Notwithstanding anything to the contrary set forth in this Section 10.4
or any other provision of this Agreement, if any bank or other financing
institution shall obtain collateral for any obligations owing to it in respect
of term loans, revolving loans, or lines of credit (regardless of whether the
grant of a Lien on such collateral shall be specifically permitted hereunder),
then the Company shall take such action as shall be necessary or appropriate so
that the Notes and all obligations of the Company in respect of this Agreement
shall be secured equally and ratably with such obligations owing to such bank or
other financing institution.

         10.5     RESTRICTED INVESTMENTS AND RESTRICTED PAYMENTS.

                  (a) LIMITATION. The Company will not, and will not permit any
         of the Subsidiaries to, at any time, (i) declare or make, or incur any
         liability to declare or make, any Restricted Payment or (ii) make, or
         incur any liability to make, any Restricted Investment unless,
         immediately after giving effect to such action:

                           (i) the sum of (x) the aggregate amount of Restricted
                  Payments of the Company and the Subsidiaries declared or made
                  during the period commencing on the date of Closing, and
                  ending on the date such Restricted Payment is declared or
                  made, inclusive, plus (y) the aggregate amount of all
                  outstanding Restricted Investments would not exceed the sum of

                                    (A) $5,000,000, plus

                                    (B) 50% of Consolidated Net Income for the
                           period commencing on April 1, 1998 and ending with
                           the last day of the fiscal quarter of the Company
                           most recently ended at the time of such action (or
                           minus 100% of Consolidated Net Income for such period
                           if Consolidated Net Income for such period is a
                           loss), plus

                                    (C) the aggregate net cash proceeds received
                           by the Company from the issue or sale of Capital
                           Stock of the Company after the date of Closing to a
                           Person other than a Subsidiary;

                           (ii) no Default or Event of Default would exist; and

                           (iii) the Company would be permitted by the
                  provisions of Section 10.1 to incur at least $1.00 of
                  additional Funded Debt (other than Funded Debt owing to a
                  Subsidiary or Funded Debt incurred pursuant to clauses (a)
                  through (d), inclusive, of Section 10.1).

                  (b) INVESTMENTS OF SUBSIDIARIES. Each Person which becomes a
         Subsidiary after the date of Closing will be deemed to have made, on
         the date such Person becomes a Subsidiary, all Restricted Investments
         of such Person in existence on such date.


HYDRIL COMPANY                         29                NOTE PURCHASE AGREEMENT
<PAGE>   35

         Investments in any Person that ceases to be a Subsidiary after the date
         of Closing (but in which the Company or another Subsidiary continues to
         maintain an Investment) will be deemed to have been made on the date on
         which such Person ceases to be a Subsidiary of the Company.

                  (c) TIME OF PAYMENT. The Company will not, nor will it permit
         any of its Subsidiaries to, authorize a Restricted Payment that is not
         payable within 60 days of authorization.

         10.6 MERGER, CONSOLIDATION, ETC.

         The Company will not, and will not permit any Subsidiary to,
consolidate with or merge with any other corporation or convey, transfer or
lease substantially all of its assets in a single transaction or series of
transactions to any Person, except that:

                  (a) the Company may consolidate with or merge with another
         corporation or convey or transfer (except by lease) all or
         substantially all of its assets in a single transaction or series of
         transactions to another Person if:

                           (i) the successor formed by such consolidation or the
                  survivor of such merger or the Person that acquires by
                  conveyance or transfer all or substantially all of the assets
                  of the Company as an entirety, as the case may be (the
                  "SUCCESSOR CORPORATION"), shall be a solvent Person organized
                  and existing under the laws of the United States of America,
                  any State thereof or the District of Columbia;

                           (ii) if the Company is not the Successor Corporation,
                  such Person shall have executed and delivered to each holder
                  of Notes its assumption of the due and punctual performance
                  and observance of each covenant and condition of the Financing
                  Documents (pursuant to such agreements and instruments as
                  shall be reasonably satisfactory to the Required Holders), and
                  the Company shall have caused to be delivered to each holder
                  of Notes an opinion of nationally recognized outside counsel,
                  or other outside counsel reasonably satisfactory to the
                  Required Holders, to the effect that all agreements or
                  instruments effecting such assumption are enforceable in
                  accordance with their terms and comply with the terms hereof;
                  and

                           (iii) immediately after giving effect to such
                  transaction,

                                    (A) no Default or Event of Default would
                           exist, and

                                    (B) the Successor Corporation would be
                           permitted by the provisions of Section 10.1 to incur
                           at least $1.00 of additional Funded Debt (other than
                           Funded Debt owing to a Subsidiary or Funded Debt
                           incurred pursuant to clauses (a) through (d),
                           inclusive, of Section 10.1);

                  (b) a Subsidiary may consolidate with or merge with the
         Company (so long as the Company is the surviving corporation) or
         another Subsidiary or convey, transfer or



HYDRIL COMPANY                         30                NOTE PURCHASE AGREEMENT

<PAGE>   36

         lease all or substantially all of its assets in a single transaction or
         series of transactions to the Company or another Subsidiary; and

                  (c) a Subsidiary may consolidate with or merge with another
         corporation or convey, transfer or lease all or substantially all of
         its assets in a single transaction or series of transactions to another
         Person if such transaction is effected in compliance with Section 10.7.

No such conveyance, transfer or lease of all or substantially all of the assets
of the Company shall have the effect of releasing the Company or any Successor
Corporation from its liability under this Agreement, the Notes or any other
Financing Document.

         10.7 DISPOSITION OF ASSETS.

                  (a) PROHIBITED AND PERMITTED TRANSFERS. The Company will not,
         and will not permit any Subsidiary to, sell, lease as lessor, transfer
         or otherwise dispose of any Property (including, without limitation,
         (x) any sale, lease, transfer or other disposition of Capital Stock of
         any Subsidiary and (y) any transfer of Capital Stock of any Subsidiary
         or Property of any Subsidiary, in either case, by means of a merger or
         consolidation of such Subsidiary, except as permitted with respect to
         the Company under Section 10.6) (herein referred to, collectively, as
         "TRANSFERS"), except:

                           (i) Transfers of inventory and other assets for cash
                  (or cash equivalents) equal to the Fair Market Value of such
                  inventory or other assets, in each case in the ordinary course
                  of business of the Person making such Transfer;

                           (ii) Transfers consisting of a swap of Property of
                  the Company or a Subsidiary for Property of another Person
                  that (x) will be used and useful in the business of the
                  Company or such Subsidiary and (y) has a Fair Market Value
                  substantially the same as the Property Transferred by the
                  Company or such Subsidiary, so long as such swap is customary
                  in the industry in which the Company or such Subsidiary
                  operates and is consummated on customary terms and conditions;

                           (iii) Transfers from a Subsidiary to the Company or
                  a Wholly-Owned Subsidiary;

                           (iv) Transfers from the Company to a Wholly-Owned
                  Subsidiary;

                           (v) the issuance of directors' qualifying shares or,
                  in the case of a Person organized under the laws of a
                  jurisdiction outside the United States, the issuance of equity
                  to local residents to the extent required by local law
                  ("REQUIRED LOCAL EQUITY"); and

                           (vi) a Transfer (other than as specified in the
                  foregoing clauses (i) to (v), inclusive) of Property in
                  exchange for the Fair Market Value thereof, provided that,
                  immediately after giving effect thereto,

                                (A) no Event of Default would exist, and



HYDRIL COMPANY                         31                NOTE PURCHASE AGREEMENT
<PAGE>   37

                                    (B) the aggregate net book value of all
                           Transfers consummated under this Section 10.7(a)(vi)
                           (such net book value being determined immediately
                           after the consummation of each such Transfer) during
                           the then current fiscal year of the Company would not
                           exceed 15% of Consolidated Total Capitalization
                           determined as of the last day of the then most
                           recently ended fiscal year of the Company;

                  provided, that if the requirements set forth in the foregoing
                  clause (B) shall not be satisfied immediately after
                  consummation of such Transfer, the Company shall be deemed to
                  be in compliance with such clause (B) on a provisional basis,
                  with respect to such Transfer (a "PROVISIONAL QUALIFIED
                  TRANSFER"), for a period of 365 days following such
                  consummation, so long as such Transfer was in exchange for
                  cash (or cash equivalents).

                           If all Net Proceeds arising from any Provisional
                  Qualified Transfer (x) shall be invested by the Company and
                  the Subsidiaries in Operating Assets at any time during such
                  365 day period or (y) shall be applied to the prepayment of
                  the principal of any Senior Funded Debt during such period,
                  then the Company shall be deemed to have complied with this
                  Section 10.7(a) with respect to such Provisional Qualified
                  Transfer. If all such Net Proceeds shall not be so invested or
                  applied by the end of such period, the Company shall be deemed
                  not to have complied with this Section 10.7(a) with respect to
                  such Provisional Qualified Transfer.

                  (b) SUBSIDIARY STOCK. Anything contained herein to the
         contrary notwithstanding, the Company will not at any time, and will
         not at any time permit any of the Subsidiaries to, sell or otherwise
         dispose of any shares of Capital Stock (or any options or warrants to
         purchase Capital Stock or other Securities exchangeable for or
         convertible into Capital Stock) of a Subsidiary (said Capital Stock,
         options, warrants and other Securities being herein referred to as
         "SUBSIDIARY STOCK"), nor will any Subsidiary issue, sell or otherwise
         dispose of any shares of its own Subsidiary Stock, if the effect of the
         transaction would be to reduce the proportionate interest of the
         Company and the other Subsidiaries in the outstanding Subsidiary Stock
         of the Subsidiary whose shares are the subject of the transaction to a
         level whereby such corporation would no longer constitute a
         "Subsidiary" as such term is defined in this Agreement, provided that
         the foregoing restrictions do not apply to:

                           (i) Subsidiary Stock pledged to the Collateral Agent
                  pursuant to any of the Collateral Documents;

                           (ii) the issuance of directors' qualifying shares or
                  Required Local Equity; and

                           (iii) the sale, to the extent permitted by Section
                  10.7(a), to a Person (other than directly or indirectly to an
                  Affiliate) of the entire Investment (whether represented by
                  stock, debt, claims or otherwise) of the Company and the other
                  Subsidiaries in any Subsidiary, if all of the following
                  conditions are met:



HYDRIL COMPANY                         32                NOTE PURCHASE AGREEMENT
<PAGE>   38

                                    (A) the Subsidiary being disposed of has no
                           continuing Investment in any other Subsidiary not
                           being simultaneously disposed of, or in the Company;
                           and

                                    (B) immediately after the consummation of
                           the transaction, and after giving effect thereto, no
                           Default or Event of Default would exist.

                  For purposes of determining the book value of Property
         constituting Subsidiary Stock being Transferred as provided in the
         foregoing clause (iii), such book value shall be deemed to be equal to
         the percentage of aggregate book value of the Property of the
         Subsidiary that shall have issued such Subsidiary Stock that is equal
         to the percentage of the entire equity of such Subsidiary represented
         by the Subsidiary Stock being Transferred.

                  (c) PREFERRED STOCK. Without limiting the foregoing, the
         Company will not permit any Subsidiary to issue or have outstanding any
         Preferred Stock if such Preferred Stock is to be held by a Person other
         than the Company or a Wholly-Owned Subsidiary, and the Company shall
         not sell, or permit any Subsidiary to sell, any Preferred Stock of any
         Subsidiary to any Person other than to the Company or to a Wholly-Owned
         Subsidiary.

         10.8 TRANSACTIONS WITH AFFILIATES.

         Except as set forth in Schedule 10.8 and except for transactions
involving only the Company and Wholly-Owned Subsidiaries, the Company will not,
and will not permit any Subsidiary to, enter into directly or indirectly any
transaction or group of related transactions (including, without limitation, the
purchase, lease, sale or exchange of Properties of any kind, the rendering of
any service, or any other transaction in the ordinary course of business) with
any Affiliate, except upon fair and reasonable terms not materially less
favorable to the Company or such Subsidiary than would be obtainable in a
comparable arm's-length transaction with a Person not an Affiliate.

         10.9 LINE OF BUSINESS.

         The Company will not, and will not permit any of its Subsidiaries to,
engage to any substantial extent in any business other than the businesses in
which the Company and its Subsidiaries were engaged during the fiscal year ended
December 31, 1997, as described in the Memorandum, and businesses reasonably
related thereto or in furtherance thereof.

         10.10 EVI INDEBTEDNESS.

         In making any determination of the Company's compliance with any
provision of this Section 10, the EVI Indebtedness and all interest charges and
other expenses incurred in connection therewith shall be disregarded. The "EVI
INDEBTEDNESS" means all of the obligations of the Company under that certain
Master Agreement between the Company and The Chase Manhattan Bank with respect
to the two transactions thereunder confirmed by the two letter agreements dated
January 6, 1998.



HYDRIL COMPANY                         33                NOTE PURCHASE AGREEMENT
<PAGE>   39

11. EVENTS OF DEFAULT.

         An "EVENT OF DEFAULT" shall exist if any of the following conditions or
events shall occur and be continuing:

                  (a) PRINCIPAL OR MAKE-WHOLE AMOUNT PAYMENT -- the Company
         defaults in the payment of any principal or Make-Whole Amount, if any,
         on any Note when the same becomes due and payable, whether at maturity
         or at a date fixed for prepayment or by declaration or otherwise; or

                  (b) INTEREST PAYMENT -- the Company defaults in the payment of
         any interest on any Note for more than five days after the same becomes
         due and payable; or

                  (c) SPECIFIED COVENANTS -- the Company defaults in the
         performance of or compliance with (i) its obligations under Section
         7.1(d) or (ii) any covenant contained in Section 10; or

                  (d) OTHER COVENANTS -- the Company defaults in the performance
         of or compliance with any term contained herein (other than those
         referred to in clauses (a), (b) and (c) of this Section 11) and such
         default is not remedied within 30 days after the earlier of (i) a
         Responsible Officer obtaining actual knowledge of such default and (ii)
         the Company receiving written notice of such default from any holder of
         a Note; or

                  (e) REPRESENTATIONS AND WARRANTIES -- any representation or
         warranty made in writing by or on behalf of the Company or by any
         officer of the Company in any Financing Document or in any writing
         furnished in connection with the transactions contemplated hereby
         proves to have been false or misleading in any material respect on the
         date as of which made; or

                  (f) CROSS-DEFAULT --

                           (i) the Company or any Subsidiary is in default (as
                  principal or as guarantor or other surety) in the payment of
                  any principal of or premium or make-whole amount or interest
                  on any Debt (other than Debt under this Agreement and the
                  Notes) beyond any period of grace provided with respect
                  thereto, that individually or together with such other Debt as
                  to which any such failure exists has an aggregate outstanding
                  principal amount of at least $3,000,000, or

                           (ii) the Company or any Subsidiary is in default in
                  the performance of or compliance with any term of any evidence
                  of any Debt (other than Debt under this Agreement and the
                  Notes) that, individually or together with such other Debt as
                  to which any such failure exists has an aggregate outstanding
                  principal amount of at least $3,000,000, or of any mortgage,
                  indenture or other agreement relating thereto or any other
                  condition exists, and as a consequence of such default or
                  condition such Debt has become, or has been declared (or one
                  or more Persons are entitled to declare such Debt to be), due
                  and payable before its stated maturity or before its regularly
                  scheduled dates of payment, or



HYDRIL COMPANY                         34                NOTE PURCHASE AGREEMENT
<PAGE>   40

                           (iii) as a consequence of the occurrence or
                  continuation of any event or condition (other than the passage
                  of time or the right of the holder of Debt to convert such
                  Debt into equity interests),

                                    (A) the Company or any Subsidiary has become
                           obligated to purchase or repay Debt before its
                           regular maturity or before its regularly scheduled
                           dates of payment in an aggregate outstanding
                           principal amount of at least $3,000,000, or

                                    (B) one or more Persons have the right to
                           require the Company or any Subsidiary so to purchase
                           or repay such Debt; or

                  (g) INSOLVENCY -- the Company or any Subsidiary

                           (i) is generally not paying, or admits in writing its
                  inability to pay, its debts as they become due,

                           (ii) files, or consents by answer or otherwise to the
                  filing against it of, a petition for relief or reorganization
                  or arrangement or any other petition in bankruptcy, for
                  liquidation or to take advantage of any bankruptcy,
                  insolvency, reorganization, moratorium or other similar law of
                  any jurisdiction,

                           (iii) makes an assignment for the benefit of its
                  creditors,

                           (iv) consents to the appointment of a custodian,
                  receiver, trustee or other officer with similar powers with
                  respect to it or with respect to any substantial part of its
                  Property,

                           (v) is adjudicated as insolvent or to be liquidated,
                  or

                           (vi) takes corporate action for the purpose of any of
                  the foregoing; or

                  (h) APPOINTMENT OF A RECEIVER -- a court or governmental
         authority of competent jurisdiction enters an order appointing, without
         consent by the Company or any Subsidiary, a custodian, receiver,
         trustee or other officer with similar powers with respect to the
         Company or such Subsidiary or with respect to any substantial part of
         the Property of the Company or any such Subsidiary, or constituting an
         order for relief or approving a petition for relief or reorganization
         or any other petition in bankruptcy or for liquidation or to take
         advantage of any bankruptcy or insolvency law of any jurisdiction, or
         ordering the dissolution, winding-up or liquidation of the Company or
         any of the Subsidiaries, or any such petition shall be filed against
         the Company or any of the Subsidiaries and such petition shall not be
         dismissed within 60 days; or

                  (i) FINAL JUDGMENT -- a final judgment or judgments for the
         payment of money aggregating in excess of $5,000,000 are rendered
         against one or more of the Company and the Subsidiaries and such
         judgment or judgments are not, within 60 days after entry thereof,
         bonded, discharged or stayed pending appeal, or are not discharged
         within 60 days after the expiration of such stay, provided that the
         calculation of the $5,000,000 shall exclude all or any portion of any
         final judgment to the extent, but only to the extent, such



HYDRIL COMPANY                         35                NOTE PURCHASE AGREEMENT
<PAGE>   41

         portion of such judgment will be covered by payments from insurance
         policies issued by sound and reputable insurers, so long as each such
         insurer shall have agreed, in writing, to make such payment in respect
         of such judgment; or

                  (j) ERISA -- if

                           (i) any Plan shall fail to satisfy the minimum
                  funding standards of ERISA or the Code for any plan year or
                  part thereof or a waiver of such standards or extension of any
                  amortization period is sought or granted under section 412 of
                  the Code,

                           (ii) a notice of intent to terminate any Plan shall
                  have been or is reasonably expected to be filed with the PBGC
                  or the PBGC shall have instituted proceedings under ERISA
                  section 4042 to terminate or appoint a trustee to administer
                  any Plan or the PBGC shall have notified the Company or any
                  ERISA Affiliate that a Plan may become a subject of any such
                  proceedings,

                           (iii) the aggregate "amount of unfunded benefit
                  liabilities" (within the meaning of section 4001(a)(18) of
                  ERISA) under all Plans, determined in accordance with Title IV
                  of ERISA, shall at any time exceed $3,000,000,

                           (iv) the Company or any ERISA Affiliate shall have
                  incurred or is reasonably expected to incur any liability
                  pursuant to Title I or IV of ERISA or the penalty or excise
                  tax provisions of the Code relating to employee benefit plans,

                           (v) the Company or any ERISA Affiliate withdraws from
                  any Multiemployer Plan, or

                           (vi) the Company or any Subsidiary establishes or
                  amends any employee welfare benefit plan that provides
                  post-employment welfare benefits in a manner that would
                  increase the liability of the Company or any Subsidiary
                  thereunder;

         and any such event or events described in clauses (i) through (vi)
         above, either individually or together with any other such event or
         events, could reasonably be expected to have a Material Adverse Effect
         (as used in this Section 11(j), the terms "EMPLOYEE BENEFIT PLAN" and
         "EMPLOYEE WELFARE BENEFIT PLAN" shall have the respective meanings
         assigned to such terms in section 3 of ERISA); or

                  (k) FINANCING DOCUMENTS -- any Financing Document shall cease
         to be in full force and effect or shall be declared by a court or other
         Governmental Authority of competent jurisdiction to be void, voidable
         or unenforceable against the Company; the validity or enforceability of
         any Financing Document against the Company shall be contested by the
         Company or any Subsidiary or Affiliate; the Company or any Subsidiary
         or Affiliate shall deny that the Company has any further liability or
         obligation under any Financing Document; or the Company or any
         Subsidiary or Affiliate shall default in the performance of any of its
         obligations in any Financing Document beyond any period of grace
         provided therefor.



HYDRIL COMPANY                         36                NOTE PURCHASE AGREEMENT
<PAGE>   42

12. REMEDIES ON DEFAULT, ETC.

         12.1 ACCELERATION.

                  (a) If an Event of Default with respect to the Company
         described in clause (g) or clause (h) of Section 11 (other than an
         Event of Default described in such clause (i) of clause (g) or
         described in such clause (vi) of clause (g) by virtue of the fact that
         such clause encompasses clause (i) of clause (g)) has occurred, all the
         Notes then outstanding shall automatically become immediately due and
         payable.

                  (b) If any other Event of Default has occurred and is
         continuing, any holder or holders of more than 25% in principal amount
         of the Notes at the time outstanding may at any time at its or their
         option, by notice or notices to the Company, declare all the Notes then
         outstanding to be immediately due and payable.

                  (c) If any Event of Default described in clause (a) or (b) of
         Section 11 has occurred and is continuing, any holder or holders of
         Notes at the time outstanding affected by such Event of Default may at
         any time, at its or their option, by notice or notices to the Company,
         declare all the Notes held by it or them to be immediately due and
         payable.

         Upon any Notes becoming due and payable under this Section 12.1,
whether automatically or by declaration, such Notes will forthwith mature and
the entire unpaid principal amount of such Notes, plus (x) all accrued and
unpaid interest thereon and (y) the Make-Whole Amount determined in respect of
such principal amount (to the full extent permitted by applicable law), shall
all be immediately due and payable, in each and every case without presentment,
demand, protest or further notice, all of which are hereby waived. The Company
acknowledges, and the parties hereto agree, that each holder of a Note has the
right to maintain its investment in the Notes free from repayment by the Company
(except as herein specifically provided for) and that the provision for payment
of a Make-Whole Amount by the Company in the event that the Notes are prepaid or
are accelerated as a result of an Event of Default, is intended to provide
compensation for the deprivation of such right under such circumstances.

         12.2 OTHER REMEDIES.

         If any Default or Event of Default has occurred and is continuing, and
irrespective of whether any Notes have become or have been declared immediately
due and payable under Section 12.1, the holder of any Note at the time
outstanding may proceed to protect and enforce the rights of such holder by an
action at law, suit in equity or other appropriate proceeding, whether for the
specific performance of any agreement contained herein or in any Note, or for an
injunction against a violation of any of the terms hereof or thereof, or in aid
of the exercise of any power granted hereby or thereby or by law or otherwise.

         12.3 RESCISSION.

         At any time after any Notes have been declared due and payable pursuant
to clause (b) or clause (c) of Section 12.1, the holders of not less than 76% in
principal amount of the Notes then outstanding, by written notice to the
Company, may rescind and annul any such declaration and its consequences if



HYDRIL COMPANY                         37                NOTE PURCHASE AGREEMENT
<PAGE>   43

                  (a) the Company has paid all overdue interest on the Notes,
         all principal of and Make-Whole Amount, if any, due and payable on any
         Notes other than by reason of such declaration, and all interest on
         such overdue principal and Make-Whole Amount, if any, and (to the
         extent permitted by applicable law) any overdue interest in respect of
         the Notes, at the Default Rate,

                  (b) all Events of Default and Defaults, other than non-payment
         of amounts that have become due solely by reason of such declaration,
         have been cured or have been waived pursuant to Section 17, and

                  (c) no judgment or decree has been entered for the payment of
         any monies due pursuant hereto or to the Notes.

No rescission and annulment under this Section 12.3 will extend to or affect any
subsequent Event of Default or Default or impair any right consequent thereon.

         12.4 NO WAIVERS OR ELECTION OF REMEDIES, EXPENSES, ETC.

         No course of dealing and no delay on the part of any holder of any Note
in exercising any right, power or remedy shall operate as a waiver thereof or
otherwise prejudice such holder's rights, powers or remedies. No right, power or
remedy conferred by any Financing Document upon any holder thereof shall be
exclusive of any other right, power or remedy referred to herein or therein or
now or hereafter available at law, in equity, by statute or otherwise. Without
limiting the obligations of the Company under Section 15, the Company will pay
to the holder of each Note on demand such further amount as shall be sufficient
to cover all costs and expenses of such holder incurred in any enforcement or
collection under this Section 12, including, without limitation, reasonable
attorneys' fees, expenses and disbursements.

13. REGISTRATION; EXCHANGE; SUBSTITUTION OF NOTES.

         13.1 REGISTRATION OF NOTES.

         The Company shall keep at its principal executive office a register for
the registration and registration of transfers of Notes. The name and address of
each holder of one or more Notes, each transfer thereof and the name and address
of each transferee of one or more Notes shall be registered in such register.
Prior to due presentment for registration of transfer, the Person in whose name
any Note shall be registered shall be deemed and treated as the owner and holder
thereof for all purposes hereof, and the Company shall not be affected by any
notice or knowledge to the contrary. The Company shall give to any holder of a
Note that is an Institutional Investor promptly upon request therefor, a
complete and correct copy of the names and addresses of all registered holders
of Notes.

         13.2 TRANSFER AND EXCHANGE OF NOTES.

         Upon surrender of any Note at the principal executive office of the
Company for registration of transfer or exchange (and in the case of a surrender
for registration of transfer, duly endorsed or accompanied by a written
instrument of transfer duly executed by the registered holder of such Note or
its attorney duly authorized in writing and accompanied by the address for
notices of each transferee of such Note or part thereof), the Company shall
execute and



HYDRIL COMPANY                         38                NOTE PURCHASE AGREEMENT
<PAGE>   44

deliver, at the Company's expense (except as provided below), one or more new
Notes (as requested by the holder thereof) in exchange therefor, in an aggregate
principal amount equal to the unpaid principal amount of the surrendered Note.
Each such new Note shall be payable to such Person as such holder may request
and shall be substantially in the form of Exhibit 1. Each such new Note shall be
dated and bear interest from the date to which interest shall have been paid on
the surrendered Note or dated the date of the surrendered Note if no interest
shall have been paid thereon. The Company may require payment of a sum
sufficient to cover any stamp tax or governmental charge imposed in respect of
any such transfer of Notes. Notes shall not be transferred in denominations of
less than $100,000, provided that if necessary to enable the registration of
transfer by a holder of its entire holding of Notes, one Note may be in a
denomination of less than $100,000. Any transferee, by its acceptance of a Note
registered in its name (or the name of its nominee), shall be deemed to have
made the representation set forth in Section 6.2.

         13.3 REPLACEMENT OF NOTES.

         Upon receipt by the Company of evidence reasonably satisfactory to it
of the ownership of and the loss, theft, destruction or mutilation of any Note
(which evidence shall be, in the case of an Institutional Investor, notice from
such Institutional Investor of such ownership and such loss, theft, destruction
or mutilation), and

                  (a) in the case of loss, theft or destruction, of indemnity
         reasonably satisfactory to it (provided that if the holder of such Note
         is, or is a nominee for, an original purchaser or a Qualified
         Institutional Buyer, such Person's own unsecured agreement of indemnity
         shall be deemed to be satisfactory), or

                  (b) in the case of mutilation, upon surrender and cancellation
         thereof,

the Company at its own expense shall execute and deliver, in lieu thereof, a new
Note, dated and bearing interest from the date to which interest shall have been
paid on such lost, stolen, destroyed or mutilated Note or dated the date of such
lost, stolen, destroyed or mutilated Note if no interest shall have been paid
thereon.

14. PAYMENTS ON NOTES.

         14.1 PLACE OF PAYMENT.

         Subject to Section 14.2, payments of principal, Make-Whole Amount, if
any, and interest becoming due and payable on the Notes shall be made in
Houston, Texas at the principal office of the Company in such jurisdiction. The
Company may at any time, by notice to each holder of a Note, change the place of
payment of the Notes so long as such place of payment shall be either the
principal office of the Company in such jurisdiction or the principal office of
a bank or trust company in such jurisdiction.

         14.2 HOME OFFICE PAYMENT.

         So long as you or your nominee shall be the holder of any Note, and
notwithstanding anything contained in Section 14.1 or in such Note to the
contrary, the Company will pay all sums becoming due on such Note for principal,
Make-Whole Amount, if any, and interest by the



HYDRIL COMPANY                         39                NOTE PURCHASE AGREEMENT
<PAGE>   45

method and at the address specified for such purpose below your name in Schedule
A, or by such other method or at such other address as you shall have from time
to time specified to the Company in writing for such purpose, without the
presentation or surrender of such Note or the making of any notation thereon,
except that upon written request of the Company made concurrently with or
reasonably promptly after payment or prepayment in full of any Note, you shall
surrender such Note for cancellation, reasonably promptly after any such
request, to the Company at its principal executive office or at the place of
payment most recently designated by the Company pursuant to Section 14.1. Prior
to any sale or other disposition of any Note held by you or your nominee you
will, at your election, either endorse thereon the amount of principal paid
thereon and the last date to which interest has been paid thereon or surrender
such Note to the Company in exchange for a new Note or Notes pursuant to Section
13.2. The Company will afford the benefits of this Section 14.2 to any
Institutional Investor that is the direct or indirect transferee of any Note
purchased by you under this Agreement and that has made the same agreement
relating to such Note as you have made in this Section 14.2.

15. EXPENSES, ETC.

         15.1 TRANSACTION EXPENSES.

         Whether or not the transactions contemplated hereby are consummated,
the Company will pay all reasonable costs and expenses (including reasonable
attorneys' fees of a special counsel and, if reasonably required, local or other
counsel) incurred by you and each Other Purchaser or holder of a Note in
connection with such transactions and in connection with any amendments, waivers
or consents under or in respect of any of the Financing Documents (whether or
not such amendment, waiver or consent becomes effective), including, without
limitation:

                  (a) the costs and expenses incurred in enforcing or defending
         (or determining whether or how to enforce or defend) any rights under
         the Financing Documents or in responding to any subpoena or other legal
         process or informal investigative demand issued in connection with the
         Financing Documents, or by reason of being a holder of any Note; and

                  (b) the reasonable costs and expenses, including financial
         advisors' fees, incurred in connection with the insolvency or
         bankruptcy of the Company or any Subsidiary or in connection with any
         work-out or restructuring of the transactions contemplated hereby and
         by the Notes.

         The Company will pay, and will save you and each other holder of a Note
         harmless from, all claims in respect of any fees, costs or expenses if
         any, of brokers and finders retained by the Company.

         15.2 SURVIVAL.

         The obligations of the Company under this Section 15 will survive the
payment or transfer of any Note, the enforcement, amendment or waiver of any
provision of any Financing Document, and the termination of any Financing
Document.



HYDRIL COMPANY                         40                NOTE PURCHASE AGREEMENT
<PAGE>   46

16. SURVIVAL OF REPRESENTATIONS AND WARRANTIES; ENTIRE AGREEMENT.

         All representations and warranties contained in the Financing Documents
shall survive the execution and delivery of this Agreement and the Notes, the
purchase or transfer by you of any Note or portion thereof or interest therein
and the payment of any Note, and may be relied upon by any subsequent holder of
a Note, regardless of any investigation made at any time by or on behalf of you
or any other holder of a Note. All statements contained in any certificate or
other instrument signed by an officer of the Company and delivered by the
Company pursuant to any Financing Document shall be deemed representations and
warranties of the Company under this Agreement. Subject to the preceding
sentence, the Financing Documents embody the entire agreement and understanding
between you and the Company and supersede all prior agreements and
understandings relating to the subject matter hereof.

17. AMENDMENT AND WAIVER.

         17.1 REQUIREMENTS.

         This Agreement and the Notes may be amended, and the observance of any
term hereof or of the Notes may be waived (either retroactively or
prospectively), with (and only with) the written consent of the Company and the
Required Holders, except that (a) no amendment or waiver of any of the
provisions of any of Sections 1, 2, 3, 4, 5, 6 and 21, or any defined term (as
it is used therein), will be effective as to you unless consented to by you in
writing, and (b) no such amendment or waiver may, without the written consent of
the holder of each Note at the time outstanding affected thereby, (i) subject to
the provisions of Section 12 relating to acceleration or rescission, change the
amount or time of any prepayment or payment of principal of, or reduce the rate
or change the time of payment or method of computation of interest or of the
Make-Whole Amount on, the Notes, (ii) change the percentage of the principal
amount of the Notes the holders of which are required to consent to any such
amendment or waiver, or (iii) amend any of Sections 8, 11(a), 11(b), 12, 17 and
20.

         17.2 SOLICITATION OF HOLDERS OF NOTES.

                  (a) SOLICITATION. The Company will provide each holder of the
         Notes (irrespective of the amount of Notes then owned by it) with
         sufficient information, sufficiently far in advance of the date a
         decision is required, to enable such holder to make an informed and
         considered decision with respect to any proposed amendment, waiver or
         consent in respect of any of the provisions hereof or of the Notes.
         The Company will deliver executed or true and correct copies of each
         amendment, waiver or consent effected pursuant to the provisions of
         this Section 17 to each holder of outstanding Notes promptly following
         the date on which it is executed and delivered by, or receives the
         consent or approval of, the requisite holders of Notes.

                  (b) PAYMENT. The Company will not directly or indirectly pay
         or cause to be paid any remuneration, whether by way of supplemental or
         additional interest, fee or otherwise, or grant any security, to any
         holder of Notes as consideration for or as an inducement to the
         entering into by any holder of Notes of any waiver or amendment of any
         of the terms and provisions hereof unless such remuneration is
         concurrently paid, or security is concurrently granted, on the same
         terms, ratably to each holder of Notes then outstanding even if such
         holder did not consent to such waiver or amendment.



HYDRIL COMPANY                         41                NOTE PURCHASE AGREEMENT
<PAGE>   47
         17.3 BINDING EFFECT, ETC.

         Any amendment or waiver consented to as provided in this Section 17
applies equally to all holders of Notes and is binding upon them and upon each
future holder of any Note and upon the Company without regard to whether such
Note has been marked to indicate such amendment or waiver. No such amendment or
waiver will extend to or affect any obligation, covenant, agreement, Default or
Event of Default not expressly amended or waived or impair any right consequent
thereon. No course of dealing between the Company and the holder of any Note nor
any delay in exercising any rights hereunder or under any Note shall operate as
a waiver of any rights of any holder of such Note. As used herein, the term
"THIS AGREEMENT" and references thereto shall mean this Agreement as it may from
time to time be amended or supplemented.

         17.4 NOTES HELD BY COMPANY, ETC.

         Solely for the purpose of determining whether the holders of the
requisite percentage of the aggregate principal amount of Notes then outstanding
approved or consented to any amendment, waiver or consent to be given under any
Financing Document, or have directed the taking of any action provided herein or
in the Notes to be taken upon the direction of the holders of a specified
percentage of the aggregate principal amount of Notes then outstanding, Notes
directly or indirectly owned by the Company or any of its Affiliates shall be
deemed not to be outstanding.

18. NOTICES.

         All notices and communications provided for hereunder shall be in
writing and sent (a) by telecopy if the sender on the same day sends a
confirming copy of such notice by a recognized overnight delivery service
(charges prepaid), or (b) by registered or certified mail with return receipt
requested (postage prepaid), or (c) by a recognized overnight delivery service
(with charges prepaid). Any such notice must be sent:

                  (i) if to you or your nominee, to you or it at the address
         specified for such communications in Schedule A, or at such other
         address as you or it shall have specified to the Company in writing,

                  (ii) if to any other holder of any Note, to such holder at
         such address as such other holder shall have specified to the Company
         in writing, or

                  (iii) if to the Company, to the Company at its address set
         forth at the beginning hereof to the attention of the Chief Financial
         Officer, telecopier: (281) 985-3287, or at such other address as the
         Company shall have specified to the holder of each Note in writing.

Notices under this Section 18 will be deemed given only when actually received.

19. REPRODUCTION OF DOCUMENTS.

         This Agreement and all documents relating hereto, including, without
limitation, (a) consents, waivers and modifications that may hereafter be
executed, (b) documents received by you at the Closing (except the Notes
themselves), and (c) financial statements, certificates and



HYDRIL COMPANY                         42                NOTE PURCHASE AGREEMENT
<PAGE>   48

other information previously or hereafter furnished to you, may be reproduced by
you by any photographic, photostatic, microfilm, microcard, miniature
photographic or other similar process and you may destroy any original document
so reproduced. The Company agrees and stipulates that, to the extent permitted
by applicable law, any such reproduction shall be admissible in evidence as the
original itself in any judicial or administrative proceeding (whether or not the
original is in existence and whether or not such reproduction was made by you in
the regular course of business) and any enlargement, facsimile or further
reproduction of such reproduction shall likewise be admissible in evidence. This
Section 19 shall not prohibit the Company or any other holder of Notes from
contesting any such reproduction to the same extent that it could contest the
original, or from introducing evidence to demonstrate the inaccuracy of any such
reproduction.

20. CONFIDENTIAL INFORMATION.

         For the purposes of this Section 20, "CONFIDENTIAL INFORMATION" means
information delivered to you by or on behalf of the Company or any Subsidiary in
connection with the transactions contemplated by or otherwise pursuant to this
Agreement that was clearly marked or labeled or otherwise adequately identified
when received by you as being confidential information of the Company or such
Subsidiary, provided that such term does not include information that

                  (a) was publicly known or otherwise known to you prior to the
         time of such disclosure,

                  (b) subsequently becomes publicly known through no act or
         omission by you or any Person acting on your behalf,

                  (c) otherwise becomes known to you other than through
         disclosure by the Company or any Subsidiary, or

                  (d) constitutes financial statements delivered to you under
         Section 7.1 that are otherwise publicly available.

You will maintain the confidentiality of such Confidential Information in
accordance with procedures adopted by you in good faith to protect confidential
information of third parties delivered to you and you will use such information
only in connection with your investment in the Notes, provided that you may
deliver or disclose Confidential Information to:

                  (i) your directors, officers, trustees, employees, agents,
         attorneys and affiliates (to the extent such disclosure reasonably
         relates to the administration of the investment represented by your
         Notes),

                  (ii) your financial advisors and other professional advisors
         who agree to hold confidential the Confidential Information
         substantially in accordance with the terms of this Section 20,

                  (iii) any other holder of any Note,



HYDRIL COMPANY                         43                NOTE PURCHASE AGREEMENT
<PAGE>   49

                  (iv) any Institutional Investor to which you sell or offer to
         sell such Note or any part thereof or any participation therein (if
         such Person has agreed in writing prior to its receipt of such
         Confidential Information to be bound by the provisions of this Section
         20),

                  (v) any Person from which you offer to purchase any security
         of the Company (if such Person has agreed in writing prior to its
         receipt of such Confidential Information to be bound by the provisions
         of this Section 20),

                  (vi) any federal or state regulatory authority having
         jurisdiction over you,

                  (vii) the National Association of Insurance Commissioners or
         any similar organization, or any nationally recognized rating agency
         that requires access to information about your investment portfolio or

                  (viii) any other Person to which such delivery or disclosure
         may be necessary or appropriate

                           (A) to effect compliance with any law, rule,
                  regulation or order applicable to you,

                           (B) in response to any subpoena or other legal
                  process,

                           (C) in connection with any litigation to which you
                  are a party, or

                           (D) if an Event of Default has occurred and is
                  continuing, to the extent you may reasonably determine such
                  delivery and disclosure to be necessary or appropriate in the
                  enforcement or for the protection of the rights and remedies
                  under your Notes, this Agreement and the other Financing
                  Documents,

         provided that, prior to your disclosure of any information described in
         this clause (viii) and to the extent practicable in the circumstances,
         you will attempt to provide advance notice of such disclosure to the
         Company but your failure to give such notice shall not result in any
         liability for you.

Each holder of a Note, by its acceptance of a Note, will be deemed to have
agreed to be bound by and to be entitled to the benefits of this Section 20 as
though it were a party to this Agreement. On reasonable request by the Company
in connection with the delivery to any holder of a Note of information required
to be delivered to such holder under this Agreement or requested by such holder
(other than a holder that is a party to this Agreement or its nominee), such
holder will enter into an agreement with the Company embodying the provisions of
this Section 20.

21. SUBSTITUTION OF PURCHASER.

         You shall have the right to substitute any one of your Affiliates as
the purchaser of the Notes that you have agreed to purchase hereunder, by
written notice to the Company, which notice shall be signed by both you and such
Affiliate, shall contain such Affiliate's agreement to be bound by this
Agreement and shall contain a confirmation by such Affiliate of the accuracy
with respect to it of the representations set forth in Section 6. Upon receipt
of such notice,



HYDRIL COMPANY                         44                NOTE PURCHASE AGREEMENT
<PAGE>   50
wherever the word "you" is used in this Agreement (other than in this Section
21), such word shall be deemed to refer to such Affiliate in lieu of you. In the
event that such Affiliate is so substituted as a purchaser hereunder and such
Affiliate thereafter transfers to you all of the Notes then held by such
Affiliate, upon receipt by the Company of notice of such transfer, wherever the
word "you" is used in this Agreement (other than in this Section 21), such word
shall no longer be deemed to refer to such Affiliate, but shall refer to you,
and you shall have all the rights of an original holder of the Notes under this
Agreement.

22. MISCELLANEOUS.

         22.1 SUCCESSORS AND ASSIGNS.

         All covenants and other agreements contained in this Agreement by or on
behalf of any of the parties hereto bind and inure to the benefit of their
respective successors and assigns (including, without limitation, any subsequent
holder of a Note) whether so expressed or not.

         22.2 PAYMENTS DUE ON NON-BUSINESS DAYS; WHEN PAYMENTS DEEMED RECEIVED.

                  (a) PAYMENTS DUE ON NON-BUSINESS DAYS. Anything in this
         Agreement or the Notes to the contrary notwithstanding, any payment of
         principal of or Make-Whole Amount or interest on any Note that is due
         on a date other than a Business Day shall be made on the next
         succeeding Business Day without including the additional days elapsed
         in the computation of the interest payable on such next succeeding
         Business Day.

                  (b) PAYMENTS, WHEN RECEIVED. Any payment to be made to the
         holders of Notes hereunder or under the Notes shall be deemed to have
         been made on the Business Day such payment actually becomes available
         to such holder at such holder's bank prior to 1:00 p.m. (local time of
         such bank).

         22.3 MAXIMUM INTEREST PAYABLE.

         The Company and each holder of Notes specifically intend and agree to
limit contractually the amount of interest payable under this Agreement and the
Notes, and all other instruments and agreements related hereto and thereto, to
the maximum amount of interest lawfully permitted to be charged under applicable
law. If applicable law is ever construed so as to render usurious any amounts
called for under this Agreement, the Notes or any related document, or
contracted for, charged, taken, reserved or received with respect to the
extension of credit evidenced hereby and thereby, or if acceleration of maturity
of any of the Notes or if any prepayment by the Company results in the Company
having paid, or demand having been made on the Company to pay, any interest in
excess of that permitted by applicable law, then all excess amounts theretofore
received by the holder or holders of the Notes shall be credited on the
principal balances of the Notes (or, if the Notes have been or would thereby be
repaid in full, refunded to the Company), and the provisions of this Agreement,
the Notes and any related document or demand on the Company shall immediately be
deemed reformed and the amounts thereafter collectible hereunder and thereunder
shall immediately be reduced, without the necessity of the execution of any new
documents, so as to comply with applicable law, but so as to permit the recovery
of the fullest amounts otherwise called for hereunder and thereunder.



HYDRIL COMPANY                         45                NOTE PURCHASE AGREEMENT
<PAGE>   51

         22.4 RELEASE OF LIENS.

         At such time as all obligations owing to the Banks have been
indefeasibly paid in full and the Bank Agreement has been terminated, or at such
time as the Banks shall execute documents releasing all Liens created in their
favor pursuant to the Collateral Documents or any other agreements, and if no
Default or Event of Default shall be continuing either immediately prior to,
or immediately after giving effect to, such payment and termination, or such
release, the holders of the Notes shall execute all commercially reasonable
documents, prepared at the Company's expense, required to release all Liens
created in their favor pursuant to the Collateral Documents.

         22.5 SEVERABILITY.

         Any provision of this Agreement that is prohibited or unenforceable in
any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of
such prohibition or unenforceability without invalidating the remaining
provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall (to the full extent permitted by law) not invalidate or
render unenforceable such provision in any other jurisdiction.

         22.6 CONSTRUCTION.

         Each covenant contained herein shall be construed (absent express
provision to the contrary) as being independent of each other covenant contained
herein, so that compliance with any one covenant shall not (absent such an
express contrary provision) be deemed to excuse compliance with any other
covenant. Where any provision herein refers to action to be taken by any Person,
or which such Person is prohibited from taking, such provision shall be
applicable whether such action is taken directly or indirectly by such Person.

         22.7 COUNTERPARTS.

         This Agreement may be executed in any number of counterparts, each of
which shall be an original but all of which together shall constitute one
instrument. Each counterpart may consist of a number of copies hereof, each
signed by less than all, but together signed by all, of the parties hereto.

         22.8 GOVERNING LAW.

         THIS AGREEMENT SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, AND
THE RIGHTS OF THE PARTIES SHALL BE GOVERNED BY, THE LAW OF THE STATE OF NEW YORK
EXCLUDING CHOICE-OF-LAW PRINCIPLES OF THE LAW OF SUCH STATE THAT WOULD REQUIRE
THE APPLICATION OF THE LAWS OF A JURISDICTION OTHER THAN SUCH STATE.

         22.9 CONSENT TO JURISDICTION; ETC.

                  (a) CONSENT TO JURISDICTION. ANY SUIT, ACTION OR PROCEEDING
         ARISING OUT OF OR RELATING TO THIS AGREEMENT, OR ANY OF THE DOCUMENTS,
         AGREEMENTS OR TRANSACTIONS CONTEMPLATED HEREBY OR ANY ACTION OR
         PROCEEDING TO EXECUTE OR OTHERWISE ENFORCE ANY JUDGMENT IN RESPECT OF
         ANY BREACH UNDER THIS AGREEMENT OR ANY



HYDRIL COMPANY                         46                NOTE PURCHASE AGREEMENT
<PAGE>   52

         DOCUMENT OR AGREEMENT CONTEMPLATED HEREBY MAY BE BROUGHT BY SUCH PARTY
         IN ANY FEDERAL DISTRICT COURT LOCATED IN NEW YORK CITY, NEW YORK, OR
         ANY NEW YORK STATE COURT LOCATED IN NEW YORK CITY, NEW YORK AS SUCH
         PARTY MAY IN ITS SOLE DISCRETION ELECT, AND BY THE EXECUTION AND
         DELIVERY OF THIS AGREEMENT, THE PARTIES HERETO IRREVOCABLY AND
         UNCONDITIONALLY SUBMIT TO THE NON-EXCLUSIVE IN PERSONAM JURISDICTION OF
         EACH SUCH COURT, AND EACH OF THE PARTIES HERETO IRREVOCABLY WAIVE AND
         AGREE NOT TO ASSERT IN ANY PROCEEDING BEFORE ANY TRIBUNAL, BY WAY OF
         MOTION, AS A DEFENSE OR OTHERWISE, ANY CLAIM THAT IT IS NOT SUBJECT TO
         THE IN PERSONAM JURISDICTION OF ANY SUCH COURT. IN ADDITION, EACH OF
         THE PARTIES HERETO IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED
         BY LAW, ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE LAYING
         OF VENUE IN ANY SUIT, ACTION OR PROCEEDING ARISING OUT OF OR RELATING
         TO THIS AGREEMENT OR ANY DOCUMENT, AGREEMENT OR TRANSACTION
         CONTEMPLATED HEREBY BROUGHT IN ANY SUCH COURT, AND HEREBY IRREVOCABLY
         WAIVES ANY CLAIM THAT ANY SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN
         ANY SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM.

                  (b) SERVICE OF PROCESS. EACH PARTY HERETO IRREVOCABLY AGREES
         THAT PROCESS PERSONALLY SERVED, SERVED BY U.S. REGISTERED MAIL OR
         SERVED IN THE MANNER PROVIDED FOR NOTICES IN THIS AGREEMENT, AT THE
         ADDRESSES PROVIDED HEREIN FOR NOTICES, SHALL CONSTITUTE, TO THE EXTENT
         PERMITTED BY LAW, ADEQUATE SERVICE OF PROCESS IN ANY SUIT, ACTION OR
         PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT OR ANY
         DOCUMENT, AGREEMENT OR TRANSACTION CONTEMPLATED HEREBY, OR ANY ACTION
         OR PROCEEDING TO EXECUTE OR OTHERWISE ENFORCE ANY JUDGMENT IN RESPECT
         OF ANY BREACH HEREUNDER OR UNDER ANY DOCUMENT OR AGREEMENT CONTEMPLATED
         HEREBY. RECEIPT OF PROCESS SO SERVED SHALL BE CONCLUSIVELY PRESUMED AS
         EVIDENCED BY A DELIVERY RECEIPT FURNISHED BY THE UNITED STATES POSTAL
         SERVICE OR ANY COMMERCIAL DELIVERY SERVICE.

                  (c) OTHER FORUMS. NOTHING HEREIN SHALL IN ANY WAY BE DEEMED TO
         LIMIT THE ABILITY OF ANY PARTY HERETO TO SERVE ANY WRITS, PROCESS OR
         SUMMONSES IN ANY MANNER PERMITTED BY APPLICABLE LAW OR TO OBTAIN
         JURISDICTION OVER ANY OTHER PARTY HERETO IN SUCH OTHER JURISDICTION,
         AND IN SUCH OTHER MANNER, AS MAY BE PERMITTED BY APPLICABLE LAW.

         22.10 SECTION HEADINGS AND TABLE OF CONTENTS.

         The titles of the Sections and the Table of Contents appear as a matter
of convenience only, do not constitute a part hereof and shall not affect the
construction hereof. The words "HEREIN", "HEREOF", "HEREUNDER" and "HERETO"
refer to this Agreement as a whole and not to any particular Section or other
subdivision. References to Sections are, unless otherwise specified, references
to Sections of this Agreement.

      [Remainder of page intentionally blank. Next page is signature page.]



HYDRIL COMPANY                         47                NOTE PURCHASE AGREEMENT

<PAGE>   53

         If you are in agreement with the foregoing, please sign the form of
agreement on the accompanying counterpart of this Agreement and return it to the
Company, whereupon the foregoing shall become a binding agreement between you
and the Company.

                                       Very truly yours,

                                       HYDRIL COMPANY


                                       By
                                         ---------------------------------------
                                            Name:
                                            Title:

The foregoing is hereby
agreed to as of the
date thereof.

[NAME OF PURCHASER]


By
  ---------------------------------------
     Name:
     Title:


By
  ---------------------------------------
     Name:
     Title:



HYDRIL COMPANY                                           NOTE PURCHASE AGREEMENT
<PAGE>   54



                                   SCHEDULE B

                                  DEFINED TERMS

                As used herein, the following terms have the respective meanings
        set forth below or set forth in the Section hereof following such term:

                "AFFILIATE" means, at any time, and with respect to any Person,

                        (a) any other Person that at such time directly or
                indirectly through one or more intermediaries Controls, or is
                Controlled by, or is under common Control with, such first
                Person, and

                        (b) any Person beneficially owning or holding, directly
                or indirectly, 10% or more of any class of voting or equity
                interests of the Company or any Subsidiary or any corporation of
                which the Company and the Subsidiaries beneficially own or hold,
                in the aggregate, directly or indirectly, 10% or more of any
                class of voting or equity interests.

        As used in this definition, "CONTROL" means the possession, directly or
        indirectly, of the power to direct or cause the direction of the
        management and policies of a Person, whether through the ownership of
        voting securities, by contract or otherwise. Unless the context
        otherwise clearly requires, any reference to an "Affiliate" is a
        reference to an Affiliate of the Company.

                "AGREEMENT, THIS" -- Section 17.3.

                "BANK AGREEMENT" means the Amended and Restated Loan Agreement,
         dated as of March 23, 1998, among each of the Company, the Banks and
         Bank One, as agent for the Banks, as amended by a First Amendment to
         Amended and Restated Loan Agreement dated as of June 25, 1998 and as
         may be further amended, supplemented, refinanced or modified from time
         to time.

                "BANK GUARANTY" -- Section 9.8.

                "BANK ONE" means Bank One, Texas, N.A.

                "BANKS" means, collectively, the "Lenders" (as defined in the
         Bank Agreement) which are parties to the Bank Agreement from time to
         time.

                "BUSINESS DAY" means (a) for the purposes of Section 8.7 only,
         any day other than a Saturday, a Sunday or a day on which commercial
         banks in New York City are required or authorized to be closed, and (b)
         for the purposes of any other provision of this Agreement, any day
         other than a Saturday, a Sunday or a day on which commercial banks in
         Houston, Texas, or New York City, New York are required or authorized
         to be closed.

                "CAPITAL LEASE" means a lease with respect to which the lessee
         is required concurrently to recognize the acquisition of an asset and
         the incurrence of a liability on its balance sheet in accordance with
         GAAP.

HYDRIL COMPANY                    SCHEDULE B-1           NOTE PURCHASE AGREEMENT


<PAGE>   55


                "CAPITAL STOCK" means any class of capital stock, share capital
         or similar equity interest of a Person.

                "CAPITAL LEASE OBLIGATION" means, with respect to any Person and
         a Capital Lease to which such Person is a party, the amount of the
         obligation of such Person as the lessee under such Capital Lease which
         would, in accordance with GAAP, appear as a liability on a balance
         sheet of such Person.

                "CHANGE IN CONTROL" means the failure, at any time and for any
         reason, of the Initial Stockholder Affiliates, as a group, to
         beneficially own (as such term is used in Section 13(d) of the Exchange
         Act as in effect on the date of Closing) and to control more than 50%
         of the Voting Stock of the Company outstanding at such time.

                "CLYDESDALE BANK FACILITY" means the $3,000,000 unsecured line
         of credit provided by Clydesdale Bank of Scotland for the benefit of
         the Company.

                "CLOSING" -- Section 3.

                "CODE" means the Internal Revenue Code of 1986, as amended from
         time to time, and the rules and regulations promulgated thereunder from
         time to time.

                "COLLATERAL" means any and all Property that at any time is
         granted to the Collateral Agent pursuant to the Collateral Documents as
         security for the payment of any or all of the obligations of the
         Company under this Agreement, the Other Agreements, the Notes and the
         Bank Agreement.

                "COLLATERAL AGENT" means Bank One, solely in its capacity as
         collateral agent under the Collateral Documents and the Intercreditor
         Agreement, and together with any successor or co-agent that becomes
         such in accordance with the provisions of the Collateral Documents and
         the Intercreditor Agreement.

                "COLLATERAL DOCUMENTS" -- Section 4.11.

                "COMPANY" -- introductory sentence.

                "CONFIDENTIAL INFORMATION" -- Section 20.

                "CONSOLIDATED DEPRECIATION EXPENSE" means, for any period, the
         amount of depreciation, depletion and amortization expense of the
         Company and the Subsidiaries, determined on a consolidated basis for
         such period, but only to the extent deducted from revenues in the
         determination of Consolidated Net Income for such period.

                "CONSOLIDATED EBITDA" means, for any period, the sum of:

                       (a)   Consolidated Net Income; plus

                       (b)   Consolidated Interest Expense; plus

                       (c)   Consolidated Tax Expense; plus


HYDRIL COMPANY                    SCHEDULE B-2           NOTE PURCHASE AGREEMENT

<PAGE>   56


                       (d)   Consolidated Depreciation Expense;

         in each case determined in respect of such period.

                "CONSOLIDATED FIXED CHARGES" means, in respect of any period,
         the sum of (a) Consolidated Interest Expense for such period, plus (b)
         Lease Rentals of the Company and the Subsidiaries for such period,
         after eliminating all offsetting debits and credits between the Company
         and the Subsidiaries and all other items required to be eliminated in
         the course of the preparation of consolidated financial statements of
         the Company and the Subsidiaries in accordance with GAAP.

                "CONSOLIDATED FUNDED DEBT" means, as of any date of
         determination, the total of all Funded Debt of the Company and the
         Subsidiaries outstanding on such date, after eliminating all offsetting
         debits and credits between the Company and the Subsidiaries and all
         other items required to be eliminated in the course of the preparation
         of consolidated financial statements of the Company and the
         Subsidiaries in accordance with GAAP.

                "CONSOLIDATED INTEREST EXPENSE" means, for any period, the
         amount of interest accrued on, or with respect to, interest bearing
         obligations of the Company and the Subsidiaries, including, without
         limitation, amortization of debt discount, imputed interest on Capital
         Leases and interest on the Notes, determined in accordance with GAAP on
         a consolidated basis for such period, but only to the extent deducted
         from revenues in the determination of Consolidated Net Income for such
         period.

                "CONSOLIDATED NET INCOME" means, with reference to any period,
         the net income (or loss) of the Company and the Subsidiaries for such
         period (taken as a cumulative whole), as determined in accordance with
         GAAP, after eliminating all offsetting debits and credits between the
         Company and the Subsidiaries and all other items required to be
         eliminated in the course of the preparation of consolidated financial
         statements of the Company and the Subsidiaries in accordance with GAAP,
         provided that there shall be excluded therefrom:

                       (a) the income (or loss) of any Person accrued prior to
                the date it becomes a Subsidiary or is merged into or
                consolidated with the Company or a Subsidiary, and the income
                (or loss) of any Person, substantially all of the assets of
                which have been acquired in any manner, realized by such other
                Person prior to the date of acquisition, and

                       (b) the income (or loss) of any business, Properties or
                assets acquired (by means of a merger, consolidation, purchase
                or otherwise) by the Company or any Subsidiary, which income (or
                loss) accrued prior to the date of such acquisition.

                "CONSOLIDATED TANGIBLE NET WORTH" means, at any time,

                       (a) the total assets of the Company and the Subsidiaries
                which would be shown as assets on a consolidated balance sheet
                of the Company and the Subsidiaries as of such time prepared in
                accordance with GAAP, after eliminating all amounts properly
                attributable to minority interests, if any, in the stock and
                surplus of such Subsidiaries, minus


HYDRIL COMPANY                    SCHEDULE B-3           NOTE PURCHASE AGREEMENT

<PAGE>   57


                       (b) the total liabilities of the Company and the
                Subsidiaries which would be shown as liabilities on a
                consolidated balance sheet of the Company and the Subsidiaries
                as of such time prepared in accordance with GAAP, minus

                       (c) the net book amount of all assets of the Company and
                the Subsidiaries (after deducting any reserves applicable
                thereto) which would be shown as intangible assets on a
                consolidated balance sheet of the Company and the Subsidiaries
                as of such time prepared in accordance with GAAP including,
                without limitation, good will, trademarks, trade names, service
                marks, brand names, copyrights, patents, capitalized research
                and development expenses, unamortized debt discount and expense
                and other similar intangible assets.

                "CONSOLIDATED TAX EXPENSE" means, for any period, tax expense of
         the Company and the Subsidiaries, determined on a consolidated basis in
         accordance with GAAP for such period, but only to the extent deducted
         from revenues in the determination of Consolidated Net Income for such
         period.

                "CONSOLIDATED TOTAL CAPITALIZATION" means, at any time, the sum
         of Consolidated Tangible Net Worth and Consolidated Funded Debt.

                "CONTROL EVENT" means

                       (a) the execution of any written agreement which, when
                fully performed by the parties thereto, would result in a Change
                in Control; or

                       (b) the making of any written offer by any person (as
                such term is used in Section 13(d) and Section 14(d)(2) of the
                Exchange Act as in effect on the date of Closing) or related
                persons constituting a group (as such term is used in Rule 13d-5
                under the Exchange Act as in effect on the date of Closing) to
                the holders of the common stock which offer, if accepted by
                the requisite number of such holders, would result in a Change
                in Control.

                "DEBT" means, with respect to any Person, without duplication,

                       (a) its liabilities for borrowed money;

                       (b) its liabilities for the deferred purchase price of
                Property acquired by such Person (excluding accounts payable and
                accrued liabilities arising in the ordinary course of business
                but including, without limitation, all liabilities created or
                arising under any conditional sale or other title retention
                agreement with respect to any such Property);

                       (c) its Capital Lease Obligations;

                       (d) all liabilities for borrowed money secured by any
                Lien with respect to any Property owned by such Person (whether
                or not it has assumed or otherwise become liable for such
                liabilities); and


HYDRIL COMPANY                    SCHEDULE B-4           NOTE PURCHASE AGREEMENT

<PAGE>   58


                       (e) any Guaranty of such Person with respect to
                liabilities of a type described in any of clauses (a) through
                (d) hereof.

        Debt of any Person shall include all obligations of such Person of the
        character described in clauses (a) through (e) above to the extent such
        Person remains legally liable in respect thereof notwithstanding that
        any such obligation is deemed to be extinguished under GAAP.

                "DEEDS OF TRUST" -- Section 4.11.

                "DEFAULT" means an event or condition the occurrence or
         existence of which would, with the lapse of time or the giving of
         notice or both, become an Event of Default.

                "DEFAULT RATE" means 8.85% per annum.

                "ENVIRONMENTAL LAWS" means any and all Federal, state, local,
         and foreign statutes, laws, regulations, ordinances, rules, judgments,
         orders, decrees, permits, concessions, grants, franchises, licenses,
         agreements or governmental restrictions relating to pollution and the
         protection of the environment or the release of any materials into the
         environment, including but not limited to those related to hazardous
         substances or wastes, air emissions and discharges to waste or public
         systems.

                "ERISA" means the Employee Retirement Income Security Act of
         1974, as amended from time to time, and the rules and regulations
         promulgated thereunder from time to time in effect.

                "ERISA AFFILIATE" means any trade or business (whether or not
         incorporated) that is treated as a single employer together with the
         Company under section 414 of the Code.

                "EVENT OF DEFAULT" -- Section 11.

                "EVI INDEBTEDNESS" -- Section 10.10.

                "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
         amended from time to time.

                "FAIR MARKET VALUE" means, at any time and with respect to any
         Property, the sale value of such Property that would be realized in an
         arm's-length sale at such time between an informed and willing buyer
         and an informed and willing seller (neither being under a compulsion to
         buy or sell).

                "FINANCIAL COVENANTS" -- Section 9.7.

                "FINANCING DOCUMENTS" means this Agreement, the Other
         Agreements, the Notes, the Collateral Documents, the Intercreditor
         Agreement and each other document or agreement executed from time to
         time in connection therewith, all as amended from time to time.


HYDRIL COMPANY                    SCHEDULE B-5           NOTE PURCHASE AGREEMENT

<PAGE>   59


                "FOREIGN PENSION PLAN" means any plan, fund or other similar
         program

                       (a) established or maintained outside of the United
                States of America by the Company or any Subsidiary primarily for
                the benefit of the employees (substantially all of whom are
                aliens not residing in the United States of America) of the
                Company or such Subsidiary, as the case may be, which plan, fund
                or other similar program provides for retirement income for such
                employees or results in a deferral of income for such employees
                in contemplation of retirement, and

                       (b) not otherwise subject to ERISA.

                "FUNDED DEBT" means, with respect to any Person, all Debt of
         such Person which by its terms or by the terms of any instrument or
         agreement relating thereto matures, or which is otherwise payable or
         unpaid, one year or more from, or is directly or indirectly renewable
         or extendible at the option of the obligor in respect thereof to a date
         one year or more (including, without limitation, an option of such
         obligor under a revolving credit or similar agreement obligating the
         lender or lenders to extend credit over a period of one year or more)
         from, the date of the creation thereof.

                "GAAP" means generally accepted accounting principles as in
         effect from time to time in the United States of America.

                "GOVERNMENTAL AUTHORITY" means

                       (a) the government of

                           (i) the United States of America or any state or
                       other political subdivision thereof, or

                           (ii) any jurisdiction in which the Company or any
                       Subsidiary conducts all or any part of its business, or
                       that asserts jurisdiction over any Properties of the
                       Company or any Subsidiary, or

                       (b) any entity exercising executive, legislative,
                judicial, regulatory or administrative functions of, or
                pertaining to, any such government.

                "GUARANTY" means, with respect to any Person, any obligation
         (except the endorsement in the ordinary course of business of
         negotiable instruments for deposit or collection) of such Person
         guaranteeing or in effect guaranteeing any indebtedness, dividend or
         other obligation of any other Person in any manner, whether directly or
         indirectly, including, without limitation, obligations incurred through
         an agreement, contingent or otherwise, by such Person:

                       (a) to purchase such indebtedness or obligation or any
                Property constituting security therefor;

                       (b) to advance or supply funds (i) for the purchase or
                payment of such indebtedness or obligation, or (ii) to maintain
                any working capital or other balance sheet condition or any
                income statement condition of any other Person or otherwise to


HYDRIL COMPANY                    SCHEDULE B-6           NOTE PURCHASE AGREEMENT

<PAGE>   60


                advance or make available funds for the purchase or payment of
                such indebtedness or obligation;

                       (c) to lease Properties or to purchase Properties or
                services primarily for the purpose of assuring the owner of such
                indebtedness or obligation of the ability of any other Person to
                make payment of the indebtedness or obligation; or

                       (d) otherwise to assure the owner of such indebtedness or
                obligation against loss in respect thereof.

         In any computation of the indebtedness or other liabilities of the
         obligor under any Guaranty, the indebtedness or other obligations that
         are the subject of such Guaranty shall be assumed to be direct
         obligations of such obligor.

                "HAZARDOUS MATERIAL" means any and all pollutants, toxic or
         hazardous wastes or any other substances that might pose a hazard to
         health or safety, the removal of which may be required or the
         generation, manufacture, refining, production, processing, treatment,
         storage, handling, transportation, transfer, use, disposal, release,
         discharge, spillage, seepage, or filtration of which is or shall be
         restricted, prohibited or penalized by any applicable law (including,
         without limitation, asbestos, urea formaldehyde foam insulation and
         polychlorinated biphenyls).

                "HOLDER" means, with respect to any Note, the Person in whose
         name such Note is registered in the register maintained by the Company
         pursuant to Section 13.1.

                "INITIAL STOCKHOLDER" means and includes Richard C. Seaver and
         Christopher T. Seaver.

                "INITIAL STOCKHOLDER AFFILIATES" means

                       (a) any Initial Stockholder;

                       (b) a spouse, child, lineal descendant, parent or sibling
                of an Initial Stockholder and any of their estates and legal
                representatives (each a "Related Person");

                       (c) any trust or charitable organization of which any
                Related Person is a trustee, director, beneficiary or grantor;
                and

                       (d) a corporation, partnership, limited liability company
                or other similar business entity of which more than 50% of the
                Voting Stock thereof is controlled, directly or indirectly, by
                any Person described in clause (a) or clause (b) of this
                definition.

                "INSTITUTIONAL INVESTOR" means (a) any original purchaser of a
         Note, (b) any holder of a Note holding more than 5% of the aggregate
         principal amount of the Notes then outstanding, and (c) any bank, trust
         company, savings and loan association or other financial institution,
         any pension plan, any investment company, any insurance company, any
         broker or dealer, or any other similar financial institution or entity,
         regardless of legal form, holding (together with any of its affiliates)
         Notes in an aggregate principal amount equal to at least $750,000.


HYDRIL COMPANY                    SCHEDULE B-7           NOTE PURCHASE AGREEMENT

<PAGE>   61



                "INTERCREDITOR AGREEMENT" -- Section 4.10.

                "INVESTMENT" means any investment, made in cash or by delivery
         of Property, by the Company or any of the Subsidiaries in any Person,
         whether by acquisition of stock, indebtedness or other obligation or
         Security, or by loan, Guaranty, advance, capital contribution or
         otherwise. An Investment shall be valued at the greater of (x) the cost
         thereof to the Company or any Subsidiary or (y) the amount originally
         entered on the books of the Company or any Subsidiary with respect
         thereto, less, in each case, any return of capital (after income taxes
         applicable thereto) upon such Investment through the sale or other
         liquidation thereof or part thereof or otherwise.

                "LEASE RENTALS" of any Person means, with respect to any period
         of 12 consecutive calendar months, the sum of the rental and other
         obligations required to be paid during such period by such Person or
         any of its Subsidiaries as lessee under all leases of real or personal
         Property (other than Capital Leases), excluding any amount required to
         be paid by the lessee (whether or not therein designated as rental or
         additional rental) on account of maintenance and repairs, insurance,
         taxes, assessments, water rates and similar charges, provided that, if
         at the date of determination, any such rental or other obligations are
         contingent or not otherwise definitely determinable by the terms of the
         related lease, the amount of such obligations (a) shall be assumed to
         be equal to the amount of such obligations for the period of 12
         consecutive calendar months immediately preceding the date of
         determination or (b) if the related lease was not in effect during such
         preceding 12-month period, shall be the amount estimated by a Senior
         Financial Officer of such Person on a reasonable basis and in good
         faith.

                "LIEN" means, with respect to any Person, any mortgage, lien,
         pledge, charge, security interest or other encumbrance, or any interest
         or title of any vendor, lessor, lender or other secured party to or of
         such Person under any conditional sale or other title retention
         agreement or Capital Lease, upon or with respect to any Property or
         asset of such Person (including in the case of stock, stockholder
         agreements, voting trust agreements and all similar arrangements).

                "MAKE-WHOLE AMOUNT" -- Section 8.7.

                "MATERIAL" means material in relation to the business,
         operations, affairs, financial condition, assets or Properties of the
         Company and the Subsidiaries taken as a whole.

                "MATERIAL ADVERSE EFFECT" means a material adverse effect on

                       (a) the business, operations, financial condition, assets
                or Properties of the Company and its Subsidiaries taken as a
                whole,

                       (b) the ability of the Company to perform its obligations
                under this Agreement, the Notes, or any other Financing Document
                to which it is a party, or

                       (c) the validity or enforceability of any of the terms or
                provisions of this Agreement, the Notes or any other Financing
                Document.

                "MEMORANDUM" -- Section 5.3.


HYDRIL COMPANY                    SCHEDULE B-8           NOTE PURCHASE AGREEMENT

<PAGE>   62


                "MULTIEMPLOYER PLAN" means any Plan that is a "multiemployer
         plan" (as such term is defined in section 4001(a)(3) of ERISA).

                "NET PROCEEDS" means, with respect to any Transfer of any
         Property by any Person, an amount equal to:

                       (a) the aggregate amount of the consideration (valued at
                the Fair Market Value of such consideration at the time of the
                consummation of such Transfer) received by such Person in
                respect of such Transfer; minus

                       (b) all reasonable out-of-pocket costs, fees, commissions
                and other expenses incurred by such Person in connection with
                such Transfer and income taxes and indemnification obligations
                paid or reasonably estimated to be payable in connection
                therewith; minus

                       (c) all obligations required to be paid by such Person as
                a result of such Transfer.

                "NOTES" -- Section 1.

                "OFFICER'S CERTIFICATE" means a certificate of a Senior
         Financial Officer or of any other officer of the Company whose
         responsibilities extend to the subject matter of such certificate.

                "OPERATING ASSETS" means operating assets of the Company or any
         Subsidiary used in the ordinary course of business of the Company or
         such Subsidiary, as such businesses were conducted on the date of
         Closing.

                "OTHER AGREEMENTS" -- Section 2.

                "OTHER PURCHASERS" -- Section 2.

                "PBGC" means the Pension Benefit Guaranty Corporation referred
         to and defined in ERISA or any successor thereto.

                "PERSON" means an individual, partnership, corporation, limited
         liability company, association, trust, unincorporated organization, or
         a government or agency or political subdivision thereof.

                "PLAN" means an "employee benefit plan" (as defined in section
         3(3) of ERISA) that is or, within the preceding five years, has been
         established or maintained, or to which contributions are or, within the
         preceding five years, have been made or required to be made, by the
         Company or any ERISA Affiliate or with respect to which the Company or
         any ERISA Affiliate may have any liability.

                "PREFERRED STOCK" means any class of Capital Stock of a Person
         that is preferred over any other class of Capital Stock of such Person
         as to the payment of dividends or other equity distributions or the
         payment of any amount upon liquidation or dissolution of such Person.


HYDRIL COMPANY                    SCHEDULE B-9           NOTE PURCHASE AGREEMENT

<PAGE>   63


                "PROPERTY" means, unless otherwise specifically limited, real or
         personal property of any kind, tangible or intangible, choate or
         inchoate.

                "PROPOSED PREPAYMENT DATE" -- Section 8.3(b).

                "PROVISIONAL QUALIFIED TRANSFER" -- Section 10.7(a).

                "PTE" -- Section 6.2(a).

                "QPAM EXEMPTION" -- Section 6.2(d).

                "QUALIFIED INSTITUTIONAL BUYER" means any Person who is a
         "qualified institutional buyer" within the meaning of such term as set
         forth in Rule 144A(a)(1) under the Securities Act.

                "REQUIRED HOLDERS" means, at any time, the holders of at least
         66 2/3% in principal amount of the Notes at the time outstanding
         (exclusive of Notes then owned by the Company, any Subsidiary, or any
         Affiliate).

                "REQUIRED LOCAL EQUITY" -- Section 10.7(a)(v).

                "RESPONSIBLE OFFICER" means any Senior Financial Officer and any
         other officer of the Company with responsibility for the administration
         of the relevant portion of this Agreement.

                "RESTRICTED INVESTMENTS" means all Investments other than the
         following:

                       (a) Investments existing on the date of the Closing and
                disclosed on Schedule 10.5 hereto;

                       (b) Investments in the Company, one or more Subsidiaries,
                or any Person that concurrently with such investment becomes a
                Subsidiary;

                       (c) Investments in commercial paper maturing not more
                than 270 days from the date of acquisition thereof by the
                Company or a Subsidiary and, at the time of such acquisition,
                given the highest rating by S&P, Moody's or any other credit
                rating agency of recognized national standing;

                       (d) Investments in United States Governmental Securities,
                provided that such obligations mature within 365 days from the
                date of acquisition thereof;

                       (e) Investments in certificates of deposit issued by an
                Acceptable Bank, provided that such obligations mature within
                365 days from the date of acquisition thereof;

                       (f) Investments in Eurodollar certificates of deposit or
                time deposits issued by an Acceptable Eurodollar Bank, provided
                that such obligations mature within 365 days from the date of
                acquisition thereof; and

                       (g) Investments in Repurchase Agreements.


HYDRIL COMPANY                    SCHEDULE B-10          NOTE PURCHASE AGREEMENT

<PAGE>   64

As used in this definition:

                "Acceptable Bank" means any bank or trust company (A) which is
         organized under the laws of the United States of America or any State
         thereof and (B) which has capital, surplus and undivided profits
         aggregating at least $100,000,000.

                "Acceptable Eurodollar Bank" means any bank or trust company
         which has capital, surplus and undivided profits aggregating at least
         One Billion Dollars ($1,000,000,000) (or the equivalent in another
         currency).

                "Moody's" means Moody's Investors Service, Inc.

                "Repurchase Agreement" means any written agreement:

                       (a) that provides for (i) the transfer of one or more
                United States Governmental Securities in an aggregate principal
                amount at least equal to the amount of the Transfer Price
                (defined below) to the Company or any of its Subsidiaries from
                an Acceptable Bank against a transfer of funds (the "Transfer
                Price") by the Company or such Subsidiary to such Acceptable
                Bank, and (ii) a simultaneous agreement by the Company or such
                Subsidiary, in connection with such transfer of funds, to
                transfer to such Acceptable Bank the same or substantially
                similar United States Governmental Securities for a price not
                less than the Transfer Price plus a reasonable return thereon
                at a date certain not later than 30 days after such transfer of
                funds;

                       (b) in respect of which the Company or such Subsidiary
                shall have the right, whether by contract or pursuant to
                applicable law, to liquidate such agreement upon the occurrence
                of any default thereunder; and

                       (c) in connection with which the Company or such
                Subsidiary, or an agent thereof, shall have taken all action
                required by applicable law or regulations to perfect a lien in
                such United States Governmental Securities.

                "S&P" means Standard & Poor's Ratings Group, a division of
         McGraw Hill, Inc.

                "United States Governmental Security" means any direct
         obligation of, or obligation guaranteed by, the United States of
         America, or any agency controlled or supervised by or acting as an
         instrumentality of the United States of America pursuant to authority
         granted by the Congress of the United States of America, so long as
         such obligation or guarantee shall have the benefit of the full faith
         and credit of the United States of America which shall have been
         pledged pursuant to authority granted by the Congress of the United
         States of America.

         "RESTRICTED PAYMENT" means:

                       (a) any dividend or other distribution, direct or
         indirect, on account of any shares of Capital Stock or Rights of the
         Company (including, without limitation, any common stock of the
         Company), now or hereafter outstanding, except a dividend or other
         distribution payable solely in shares of common stock of the Company;


HYDRIL COMPANY                    SCHEDULE B-11          NOTE PURCHASE AGREEMENT

<PAGE>   65


                       (b) any dividend or other distribution, direct or
                indirect, on account of any shares of Capital Stock or Rights of
                any Subsidiary, now or hereafter outstanding, except:

                           (i) a dividend payable solely in shares of common
                       stock of such Subsidiary; and

                           (ii) to the extent that such dividend or distribution
                       is, directly or indirectly, payable to the Company or a
                       Wholly-Owned Subsidiary;

                       (c) any redemption, retirement, purchase or other
                acquisition, direct or indirect, of any shares of Capital Stock
                or Rights of the Company now or hereafter outstanding, except to
                the extent that such redemption, retirement, purchase or other
                acquisition is effected solely by the issuance of common stock
                (or the sale proceeds from the issuance thereof); and

                       (d) any payment, whether in respect of principal,
                premium, interest, fees, expenses or otherwise, in respect of,
                or any redemption, retirement, purchase or other acquisition,
                direct or indirect, of, any Debt owed by the Company or any
                Subsidiary to any Affiliate (other than a Subsidiary) to the
                extent that all such payments subsequent to April 1, 1998 and on
                or prior to any date of determination are in excess of all
                similar amounts paid by any Affiliate (other than a Subsidiary)
                to the Company or any Subsidiary on or after April 1, 1998 and
                on or prior to such date of determination.

         For purposes of this Agreement, the amount of any Restricted Payment
         made in Property shall be the greater of (x) the Fair Market Value of
         such Property (as determined in good faith by the board of directors
         (or equivalent governing body) of the Person making such Restricted
         Payment) and (y) the net book value thereof on the books of such
         Person, in each case determined as of the date on which such Restricted
         Payment is made.

                "RIGHTS" means, with respect to any Person, any right, warrant,
         option or other similar right to purchase or receive Capital Stock of
         such Person.

                "SECURITIES ACT" means the Securities Act of 1933, as amended
         from time to time.

                "SECURITY" means "security" as defined by section 2(1) of the
         Securities Act.

                "SENIOR FINANCIAL OFFICER" means the chief financial officer,
         principal accounting officer, treasurer or comptroller of the Company.

                "SENIOR FUNDED DEBT" means the Notes and Funded Debt outstanding
         under the Bank Agreement ("Bank Funded Debt"), provided that, in
         connection with a repayment of Senior Funded Debt under Section 10.7,
         the availability of Bank Funded Debt under the Bank Agreement is
         permanently reduced in an amount equal to the amount of Bank Funded
         Debt so repaid.

                "SOURCE" -- Section 6.2.


HYDRIL COMPANY                    SCHEDULE B-12          NOTE PURCHASE AGREEMENT

<PAGE>   66


                "SUBSIDIARY" shall mean, as to any Person, any corporation,
         association or other business entity in which such Person or one or
         more of its Subsidiaries or such Person and one or more of its
         Subsidiaries owns more than 50% (by number of votes) of each class of
         the Voting Stock or sufficient equity or voting interests to enable it
         or them (as a group) ordinarily, in the absence of contingencies, to
         elect a majority of the directors (or Persons performing similar
         functions) of such entity. Unless the context otherwise clearly
         requires, any reference to a "Subsidiary" is a reference to a
         Subsidiary of the Company.

                "SUBSIDIARY STOCK" -- Section 10.7(b).

                "SUCCESSOR CORPORATION" -- Section 10.6.

                "TRANSFERS" -- Section 10.7(a).

                "UBS FACILITY" means the $10,000,000 unsecured revolving line
         of credit provided by Union Bank of Switzerland for the benefit of
         Hydril S.A. or any replacement, refunding, amendment, refinancing or
         modification thereof.

                "UNAPPLIED NET PROCEEDS" means, at any date, the Net Proceeds
         from Provisional Qualified Transfers that have not been applied as
         provided in either clause (x) or clause (y) of the last paragraph of
         Section 10.7(a) as of such date.

                "VOTING STOCK" shall mean, with respect to any Person, Capital
         Stock of any class or classes of a corporation, an association or
         another business entity the holders of which are ordinarily, in the
         absence of contingencies, entitled to vote in the election of corporate
         directors (or individuals performing similar functions) of such Person
         or which permit the holders thereof to control the management of such
         Person, including general partnership interests in a partnership and
         membership interests in a limited liability company.

                "WHOLLY-OWNED SUBSIDIARY" shall mean, as to any Person, any
         Subsidiary 100% of all of the capital stock or other ownership interest
         of which is owned by any one or more of such Person and such Person's
         other Wholly-Owned Subsidiaries.



HYDRIL COMPANY                    SCHEDULE B-13          NOTE PURCHASE AGREEMENT




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