As filed with the Securities and Exchange Commission on August 19,
   2003

                                           Registration No. 333-88801
   ======================================================================


                     SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C. 20549

                          ------------------------

                               POST-EFFECTIVE
                               AMENDMENT NO. 1
                                     TO
                                  FORM S-8
                           REGISTRATION STATEMENT
                                    UNDER
                         THE SECURITIES ACT OF 1933
                          -------------------------

                          ILLINOIS TOOL WORKS INC.
           (Exact name of registrant as specified in its charter)

             DELAWARE                             36-1258310
        (State of incorporation)              (I.R.S. Employer
                                             Identification No.)

                            3600 WEST LAKE AVENUE
                        GLENVIEW, ILLINOIS 60025-5811
                  (Address of principal executive offices)

               PREMARK INTERNATIONAL, INC. 1994 INCENTIVE PLAN
               PREMARK INTERNATIONAL, INC. DIRECTOR STOCK PLAN
                          (Full title of the Plans)

                           STEWART S. HUDNUT, ESQ.
             SENIOR VICE PRESIDENT, GENERAL COUNSEL & SECRETARY
                          ILLINOIS TOOL WORKS INC.
                            3600 WEST LAKE AVENUE
                        GLENVIEW, ILLINOIS 60025-5811
                               (847) 724-7500
                     (Name, address and telephone number
                            of agent for service)

                               WITH A COPY TO:

                         EDWARD SPACAPAN, JR., ESQ.
                            SCHIFF HARDIN & WAITE
                              6600 SEARS TOWER
                        CHICAGO, ILLINOIS 60606-6473
                               (312) 258-5500
                         ___________________________







                              EXPLANATORY NOTE


        Illinois Tool Works Inc. (the "Registrant") filed a Registration
   Statement on Form S-8 on December 28, 1999 (File No. 333-88801) which
   registered 8,239,306 shares of common stock, par value $.01 per share
   ("Common Stock"), of the Registrant reserved for issuance pursuant to
   the Premark International, Inc. 1994 Incentive Plan (the "Premark
   Incentive Plan") and the Premark International, Inc. Director Stock
   Plan (the "Premark Director Plan").

        On March 18, 2003, the Registrant's Board of Directors approved,
   subject to stockholder approval, the merger of the Premark Incentive
   Plan into the Illinois Tool Works Inc. 1996 Stock Incentive Plan (the
   "ITW Plan").  The merger was approved by the Registrant's stockholders
   at its Annual Meeting of Stockholders on May 9, 2003.  No future
   awards will be made under the Premark Incentive Plan or the Premark
   Director Plan.

        On August 8, 2003, the Registrant's Board of Directors authorized
   the filing of this Post-Effective Amendment No. 1 to the Registration
   Statement to deregister an aggregate of 2,499,279 shares of Common
   Stock previously registered that remain available for future grant
   under the Premark Incentive Plan.  All of the 2,499,279 shares
   deregistered by this Post-Effective Amendment No. 1 are concurrently
   being registered on a registration statement on Form S-8 for the ITW
   Plan, and the associated registration fee paid by the Registrant to
   register these shares for the Premark Incentive Plan is being carried
   forward and applied to the registration fee necessary to register
   these shares under the ITW Plan.

        This Post-Effective Amendment No. 1 is also filed to terminate
   the Registration Statement with respect to the Premark Director Plan.
   All of the awards made to directors under the Premark Director Plan
   have been exercised or have expired and are no longer exercisable.  No
   future awards will be made under the Premark Director Plan.

















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                                 SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, the
   Registrant certifies that it has reasonable grounds to believe that it
   meets all of the requirements for filing a Post-Effective Amendment
   No. 1 to Form S-8 Registration Statement and has duly caused this
   Post-Effective Amendment to be signed on its behalf by the
   undersigned, thereunto duly authorized, in the City of Glenview, State
   of Illinois, on August 8, 2003.

                            ILLINOIS TOOL WORKS INC.



                            By: /s/ Stewart S. Hudnut
                                --------------------------------------
                                 Stewart S. Hudnut,
                                 Senior Vice President,
                                 General Counsel & Secretary




        Pursuant to the requirements of the Securities Act of 1933, this
   Post-Effective Amendment has been signed by the following persons in
   the capacities indicated on August 8, 2003.

   SIGNATURE                                    TITLE
   ---------                                    -----


    /s/ W. James Farrell              Chairman & Chief Executive Officer
   -----------------------------      & Director
   W. James Farrell                   (Principal Executive Officer)


    /s/ Jon C. Kinney                 Senior Vice President & Chief
   -----------------------------      Financial Officer
   Jon C. Kinney                      (Principal Financial & Accounting
                                      Officer)

    /s/ William F. Aldinger           Director
   -----------------------------
   William F. Aldinger

    /s/ Michael J. Birck              Director
   -----------------------------
   Michael J. Birck




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    /s/ Marvin D. Brailsford          Director
   -----------------------------
   Marvin D. Brailsford

    /s/ James R. Cantalupo            Director
   -----------------------------
   James R. Cantalupo

    /s/ Susan Crown                   Director
   -----------------------------
   Susan Crown

    /s/ Don H. Davis, Jr.             Director
   -----------------------------
   Don H. Davis, Jr.

    /s/ Robert C. McCormack           Director
   -----------------------------
   Robert C. McCormack

    /s/ Robert S. Morrison            Director
   -----------------------------
   Robert S. Morrison

    /s/ Harold B. Smith               Director
   -----------------------------
   Harold B. Smith

























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