EXHIBIT 99.2


I, Steven W. Krablin, Chief Financial Officer of National-Oilwell, Inc.,
certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

   (1)   the Quarterly Report on Form 10-Q for the quarterly period ended June
         30, 2002 (the "Periodic Report') which this statement accompanies fully
         complies with the requirements of Section 13(a) of the Securities
         Exchange Act of 1934 (15 U.S.C. 78m) and


   (2)   information contained in the Periodic Report fairly presents, in all
         material respects, the financial condition and results of operations of
         National-Oilwell, Inc.


Dated: August 12, 2002

                              /s/ Steven W. Krablin
                              -----------------------------
                                Steven W. Krablin
                             Chief Financial Officer