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Exhibit 31.1

I, Christopher T. Seaver, certify that:



| | 1. |  | I have reviewed this Quarterly Report on Form 10-Q of
Hydril Company;                                                                                                                                                                                                                                     
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| | 2. |  | Based on my knowledge, this report does not contain
any untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in light of
the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;
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| | 3. |  | Based on my knowledge, the financial statements, and
other financial information included in this report, fairly
present in all material respects the financial condition,
results of operations and cash flows of the registrant as of,
and for, the periods presented in this report;                   
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| | 4. |  | The registrants other certifying officer(s) and I
are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules
13a-15(e) for the registrant and have:                                                                                           



| | (a)  |  | Designed such disclosure controls and procedures, or
caused such disclosure controls and procedures to be
designed under our supervision, to ensure that material
information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others
within those entities, particularly during the period in
which this report is being prepared;         
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| | (b)* |  |                                                                                                                                                                                                                                                                                                                                                                                        
|
| | (c)  |  | Evaluated the effectiveness of the registrants
disclosure controls and procedures and presented in this
report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and                                                                                                    
|
| | (d)  |  | Disclosed in this report any change in the registrants
internal control over financial reporting that occurred
during the registrants most recent fiscal quarter (the
registrants fourth fiscal quarter in the case of an annual
report) that has materially affected, or is reasonably
likely to materially affect, the registrants internal
control over financial reporting; and



| | 5. |  | The registrants other certifying officer(s) and I
have disclosed, based on our most recent evaluation of internal
control over financial reporting, to the registrants auditors
and the audit committee of the registrants board of directors
(or persons performing the equivalent functions):
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| | (a) |  | All significant deficiencies and material
weaknesses in the design or operation of internal control
over financial reporting which are reasonably likely to
adversely affect the registrants ability to record,
process, summarize and report financial information; and
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| | (b) |  | Any fraud, whether or not material, that
involves management or other employees who have a
significant role in the registrants internal control over
financial reporting.                                                                                               

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|-------------------- | ------------------------- |  |  | 
|                     |                           | 
|Date: August 5, 2004 | /s/ Christopher T. Seaver | 
|                     | Christopher T. Seaver     | 
|                     | Chief Executive Officer   | 
|