================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-K/A
                                (Amendment No. 1)

       FOR ANNUAL AND TRANSITION REPORTS PURSUANT TO SECTIONS 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

[X]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

                   FOR THE FISCAL YEAR ENDED DECEMBER 31, 2006

[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

     FOR THE TRANSITION PERIOD FROM _________________ TO __________________

                         COMMISSION FILE NUMBER 1-10235

                                IDEX CORPORATION
             (Exact Name of Registrant as Specified in its Charter)


                   DELAWARE                               36-3555336
        (State or other jurisdiction of                (I.R.S. Employer
        incorporation or organization)                Identification No.)

     630 DUNDEE ROAD, NORTHBROOK, ILLINOIS                   60062
   (Address of principal executive offices)               (Zip Code)

                 Registrant's telephone number: (847) 498-7070

          SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:


       TITLE OF EACH CLASS          NAME OF EACH EXCHANGE ON WHICH REGISTERED
       -------------------          -----------------------------------------
          COMMON STOCK,                      NEW YORK STOCK EXCHANGE
    PAR VALUE $.01 PER SHARE               AND CHICAGO STOCK EXCHANGE


        SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT: NONE

Indicate by check mark if the registrant is a well-known seasoned issuer, as
defined in Rule 405 of the Securities Act.  Yes [X]  No [ ]

Indicate by check mark if the registrant is not required to file reports
pursuant to Section 13 or Section 15(d) of the Act.  Yes [ ]  No [X]

Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]  No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.  [X]

Indicate by check mark whether the registrant is a large accelerated filer, an
accelerated filer or a non-accelerated filer. See definition of "accelerated
filer and large accelerated filer" in Rule 12b-2 of the Exchange Act.

Large accelerated filer [X]   Accelerated filer [ ]    Non-accelerated filer [ ]

Indicate by check mark whether the registrant is a shell company (as defined in
Rule 12b-2 of the Act).  Yes [ ]  No [X]

The aggregate market value of the voting stock (based on the June 30, 2006
closing price of $47.20) held by non-affiliates of IDEX Corporation was
$2,495,689,616.

The number of shares outstanding of IDEX Corporation's common stock, par value
$.01 per share (the "Common Stock"), as of February 15, 2007 was 53,823,941 (net
of treasury shares).

                       DOCUMENTS INCORPORATED BY REFERENCE
None

================================================================================



EXPLANATORY NOTE

This Amendment No. 1 to the Company's Annual Report on Form 10K for the year
ended December 31, 2006 is being filed to amend Exhibit 13 to include language
required by the New York Stock Exchange certification disclosures.

As such, we have filed the following exhibits herewith:

   13     The portions of IDEX Corporation's 2006 Annual Report to Shareholders,
          which are specifically incorporated by reference

   31.1   Certification of Chief Executive Officer Pursuant to Section 302 of
          the Sarbanes-Oxley Act of 2002

   31.2   Certification of Chief Financial Officer Pursuant to Section 302 of
          the Sarbanes-Oxley Act of 2002



Except as described above, no other changes have been made to the original
filing and this Form 10-K/A does not amend, update or change the financial
statements or any other items or disclosures in the original filing.




                                   SIGNATURES

       Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.




                                  IDEX CORPORATION

                                  By: /s/ DOMINIC A. ROMEO
                                      ------------------------------------------
                                      Dominic A. Romeo
                                      Vice President and Chief Financial Officer

Date: May 1, 2007



                                        2