FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * ZENTMYER HUGH J   2. Issuer Name and Ticker or Trading Symbol ILLINOIS TOOL WORKS INC [ITW] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Executive Vice President (Last) (First) (Middle) 3600 W. LAKE AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 12/20/2005 (Street) GLENVIEW, IL 60026-1215 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock (1) (2) 12/20/2005   S   3,579 D $ 89.0848 8,982 D   Common Stock (1) (2) 12/20/2005   G   2,000 D $ 89.605 6,982 D   Common Stock (7) 12/20/2005   G   2,000 A $ 89.605 2,000 I See Footnote (7) Common Stock (3) 08/30/2005   A   0 A $ 0 11,014 I See Footnote (3) Common Stock (4) 08/30/2005   A   0 A $ 0 7,875 I See Footnote (4) Common Stock (5) 09/30/2005   A   0 A $ 0 325 I See Footnote (5)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Employee Stock Option (6)

$ 30.125

11/17/2005

M

24,000

12/08/1996

12/08/2005

Common Stock

24,000

$ 30.125

0

D

Employee Stock Option (6)

$ 55.875

12/15/2000

A

60,000

12/15/2001

12/15/2010

Common Stock

60,000

$ 55.875

60,000

D

Employee Stock Option (6)

$ 62.25

12/14/2001

A

50,000

12/14/2002

12/14/2011

Common Stock

50,000

$ 62.25

50,000

D

Employee Stock Option (6)

$ 94.26

12/10/2004

A

40,000

12/10/2005

12/10/2014

Common Stock

40,000

$ 94.26

40,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ZENTMYER HUGH J 3600 W. LAKE AVENUE GLENVIEW, IL 60026-1215			Executive Vice President

Signatures

Hugh J. Zentmyer by James H. Wooten, Jr., V.P., Gen. Counsel & Secretary Attorney-In-Fact POA on File		12/22/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Includes grant of restricted stock vesting over 3 year period: 12/16/2003, 12/16/2004, 12/16/2005.
(2)	Includes grant of restricted stock vesting over 3 year period: 12/16/2004, 12/16/2005, 12/18/2006
(3)	These shares, previously reported as directly owned by the reporting person, were transferred to a trust established by the reporting person's spouse.
(4)	Includes 7,875 shares allocated to my account in the Illinois Tool Works Inc. Savings & Investment Plan as of 9/30/2005. These shares were previously reported as directly owned.
(5)	Includes 325 shares held in a trust of which I am the Trustee and in which a member of my immediate family has a pecuniary interest. These shares were previously reported as directly owned.
(6)	Options vest in four equal annual installments beginning one year from date of grant.
(7)	Shares previously reported as directly owned and subsequently transferred to the Hugh J. Zentmyer Revocable Trust - Hugh J. Zentmyer Trustee.

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