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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 MUf9WT/8Hr2G9rqyP34/+f4CFOG/xbxDNJeZb2+HNsmZR3n0vR6gUXVb3W6+uwyR
 PddLxq1fyG5hwiT4YuqlDw==

<SEC-DOCUMENT>0001209191-03-036186.txt : 20031222
<SEC-HEADER>0001209191-03-036186.hdr.sgml : 20031222
<ACCEPTANCE-DATETIME>20031222134149
ACCESSION NUMBER:		0001209191-03-036186
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031219
FILED AS OF DATE:		20031222

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SMITH HAROLD B
		CENTRAL INDEX KEY:			0001187129

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-04797
		FILM NUMBER:		031067211

	MAIL ADDRESS:	
		STREET 1:		C/O ILLINOIS TOOL WORKS INC
		STREET 2:		3600 WEST LAKE AVENUE
		CITY:			GLENVIEW
		STATE:			IL
		ZIP:			60025

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ILLINOIS TOOL WORKS INC
		CENTRAL INDEX KEY:			0000049826
		STANDARD INDUSTRIAL CLASSIFICATION:	GENERAL INDUSTRIAL MACHINERY & EQUIPMENT [3560]
		IRS NUMBER:				361258310
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3600 W LAKE AVE
		CITY:			GLENVIEW
		STATE:			IL
		ZIP:			60025-5811
		BUSINESS PHONE:		8476574106

	MAIL ADDRESS:	
		STREET 1:		3600 WEST LAKE AVENUE
		CITY:			GLENVIEW
		STATE:			IL
		ZIP:			60025-5811
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>boc81711_02hbs.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-12-19</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000049826</issuerCik><issuerName>ILLINOIS TOOL WORKS INC</issuerName>        <issuerTradingSymbol>ITW</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001187129</rptOwnerCik><rptOwnerName>SMITH HAROLD B</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>C/O ILLINOIS TOOL WORKS INC</rptOwnerStreet1><rptOwnerStreet2>3600 WEST LAKE AVENUE</rptOwnerStreet2><rptOwnerCity>GLENVIEW</rptOwnerCity><rptOwnerState>IL</rptOwnerState><rptOwnerZipCode>60025</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonD
erivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-12-19</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>70375</value></transactionShares><transactionPricePerShare><value>82.977</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>9591780</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>See Footnotes</value><footnoteId id="F1" /><footnoteId id="F2" /><footnoteId id="F3" /></natureOfOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes><footnote id="F1">510,316 shar
es held in a revocable trust created by me.</footnote><footnote id="F2">8,745,424 shares held in a trust of which I am a co-trustee and have a direct beneficial interest.</footnote><footnote id="F3">336,040 shares held in a trust of which I am a co-trustee and have a contingent beneficial interest.</footnote></footnotes><ownerSignature><signatureName> Harold B. Smith by S. S. Hudnut, Sr. V.P., Gen. Counsel &amp; Secretary   Attorney-In-Fact   POA on File</signatureName><signatureDate>2003-12-19</signatureDate></ownerSignature></ownershipDocument>

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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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