EXHIBIT 32.1

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER

          Pursuant to 18 U.S.C. Section 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, 2005 (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.


March 6, 2006                           /s/ Lawrence D. Kingsley
                                        ----------------------------------------
                                        Lawrence D. Kingsley
                                        President and Chief Executive Officer