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

OMB APPROVAL OMB Number: 3235-0287 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person * SANTI ERNEST SCOTT   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 V.P. (Last) (First) (Middle) ILLINOIS TOOL WORKS INC., 3600 WEST LAKE 3. Date of Earliest Transaction (Month/Day/Year) 03/16/2006 (Street) GLENVIEW, IL 60026 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) (4) 03/16/2006   M   5,000 A $ 54.62 9,673 D   Common Stock (1) (2) (4) 03/16/2006   S   5,000 D $ 97.41 4,673 D   Common Stock (3) 08/08/1998   A   0 A $ 0 1,433 I See Footnote (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.		SEC 1474 (9-02)

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 (4)

$ 54.62

03/16/2006

M

5,000

12/12/1998

12/12/2007

Common Stock

5,000

$ 54.62

0

D

Employee Stock Option (4)

$ 58.25

12/11/1998

A

5,000

12/11/1999

12/11/2008

Common Stock

5,000

$ 58.25

5,000

D

Employee Stock Option (4)

$ 65.5

12/17/1999

A

6,000

12/17/2000

12/17/2009

Common Stock

6,000

$ 65.5

6,000

D

Employee Stock Option (4)

$ 55.875

12/15/2000

A

15,000

12/15/2001

12/15/2010

Common Stock

15,000

$ 55.875

15,000

D

Employee Stock Option (4)

$ 62.25

12/14/2001

A

12,000

12/14/2002

12/14/2011

Common Stock

12,000

$ 62.25

12,000

D

Employee Stock Option (4)

$ 94.26

12/10/2004

A

30,000

12/10/2005

12/10/2014

Common Stock

30,000

$ 94.26

30,000

D

Employee Stock Option (5)

$ 84.16

02/01/2006

A

35,000

12/07/2006

02/01/2016

Common Stock

35,000

$ 84.16

35,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SANTI ERNEST SCOTT ILLINOIS TOOL WORKS INC. 3600 WEST LAKE GLENVIEW, IL 60026			Executive V.P.

Signatures

Ernest Scott Santi by James H. Wooten, Jr., V.P., Gen. Counsel & Secretary Attorney-In-Fact POA on File		03/20/2006
**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 that vested over a 3 year period 12/16/2003, 12/16/2004, and 12/16/2005.
(2)	Includes grant of restricted stock vesting over a 3 year period 12/16/2004, 12/16/2005, 12/18/2006.
(3)	Shares allocated to my account in the Illinois Tool Works Inc. Savings & Investment Plan. Information reported as of December 31, 2005.
(4)	Options vest in four equal annual installments beginning one year from date of grant.
(5)	Options vest in four equal annual installments beginning in each December following the grant date.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.