<PAGE> 1
EXHIBIT 21.1
SUBSIDIARIES OF HYDRIL COMPANY
<TABLE>
<CAPTION>
PERCENTAGE PERCENTAGE
OF VOTING OF VOTING
SECURITIES SECURITIES
OWNED BY OWNED BY
HYDRIL IMMEDIATE
COMPANY PARENT
---------- ----------
<S> <C> <C>
Hydril S.A. (Switzerland) .......................................... 53%*
Hydril Canadian Company, Ltd. (Canada) ............................. 100%
Hydril U.K. Ltd. (England, U.K.) ................................... 100%
Rototec Ltd.(Scotland, U.K.) ................................ 100%
Hydril Private Ltd. (Republic of Singapore) ........................ 100%
Technical Drilling & Production Services
Nigeria, Ltd. (Nigeria) ............................... 60%
P.T. Hydril Indonesia (Indonesia) ........................... 100%
Hydril S.A. de C.V. (Mexico) ....................................... 100%
Bettis de Mexico S.A. de C.V. (Mexico) ............................. 100%
</TABLE>
*Hydril Private Ltd. owns the remaining 47% equity interest in Hydril S.A.
