EXHIBIT 99.1


                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER

     Pursuant to 18 U.S.C. ss.1350, as created by Section 906 of the
Sarbanes-Oxley Act of 2002, the undersigned officer of IDEX Corporation (the
"COMPANY") hereby certifies, to such officer's knowledge, that:

     (i) the accompanying Annual Report on Form 10-K of the Company for the
   annual period ended December 31, 2002 (the "REPORT") fully complies with the
   requirements of Section 13(a) or Section 15(d), as applicable, of the
   Securities Exchange Act of 1934, as amended; and

     (ii) the information contained in the Report fairly presents, in all
   material respects, the financial condition and results of operations of the
   Company.


   February 28, 2003                    /s/ Dennis K. Williams
                                        ----------------------------
                                        Dennis K. Williams
                                        Chairman, President and Chief
                                        Executive Officer