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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

Commission file number 1-4797

ILLINOIS TOOL WORKS INC.

(Exact Name of Registrant as Specified in its Charter)

Registrant’s telephone number, including area code: (847) 724-7500

Securities registered pursuant to Section 12(b) of the Act:

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 (§229.405 of this chapter) 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. [  ]

          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. (Check one):

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 held by non-affiliates of the registrant as of June 30, 2005 was approximately $16,500,000,000, based on the New York Stock Exchange closing sales price as of June 30, 2005.

          Shares of Common Stock outstanding at January 31, 2006 — 280,918,867.

Documents Incorporated by Reference

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PART I

General

      Illinois Tool Works Inc. (the “Company” or “ITW”) was founded in 1912 and incorporated in 1915. The Company is a worldwide manufacturer of highly engineered products and specialty systems. The Company has approximately 700 operations in 48 countries which were aggregated and organized for internal reporting purposes in 2005 into the following five segments:

      Engineered Products — North America: Businesses in this segment are located in North America and manufacture a variety of short lead-time plastic and metal components and fasteners, as well as specialty products for a diverse customer base. These commercially oriented, value-added products become part of the customers’ products and typically are manufactured and delivered in a time period less than 30 days.

      In the plastic and metal components and fasteners category, products include:

      In the specialty products category, products include:

      Engineered Products — International: Businesses in this segment are located outside North America and manufacture a variety of short lead-time plastic and metal components and fasteners, as well as specialty products for a diverse customer base. These commercially oriented, value-added products become part of the customers’ products and typically are manufactured and delivered in a time period less than 30 days.

      In the plastic and metal components and fastener category, products include:

      In the specialty products category, products include:

      Specialty Systems — North America: Businesses in this segment are located in North America and design and manufacture longer lead-time machinery and related consumables, as well as specialty equipment for a diverse customer base. These commercially oriented, value-added products become part of the customers’ processes and typically are manufactured and delivered in a time period of more than 30 days.

      In the machinery and related consumables category, products include:

      In the specialty equipment category, products include:

      Specialty Systems — International: Businesses in this segment are located outside North America and design and manufacture longer lead-time machinery and related consumables, as well as specialty equipment for a diverse customer base. These commercially oriented, value-added products become part of the customers’ processes and typically are manufactured and delivered in a time period of more than 30 days.

      In the machinery and related consumables category, products include:

      In the specialty equipment category, products include:

      Leasing and Investments: Businesses in this segment make investments in mortgage entities; leases of telecommunications, aircraft, air traffic control and other equipment; properties; affordable housing and a venture capital fund.

      The Company’s significant investments are described below:

In January 2006, the Company announced that given the planned run-off of assets in the Leasing and Investments portfolio and its desire to utilize free cash flow for core manufacturing investments and acquisitions, rather than to make additional financial investments, management has decided to no longer report this activity as a segment on a prospective basis. In 2006, income from these activities will be reported as non-operating investment income.

80/20 Business Process

      A key element of the Company’s business strategy is its continuous 80/20 business process for both existing businesses and new acquisitions. The basic concept of this 80/20 business process is to focus on what

is most important (the 20% of the items which account for 80% of the value) and to spend less time and resources on the less important (the 80% of the items which account for 20% of the value). The Company’s operations use this 80/20 business process to simplify and focus on the key parts of their business, and as a result, reduce complexity that often disguises what is truly important. The Company’s 700 operations utilize the 80/20 process in various aspects of its business. Common applications of the 80/20 business process include:

      The result of the application of this 80/20 business process is that the Company improves its operating and financial performance. These 80/20 efforts often result in restructuring projects that reduce costs and improve margins. Corporate management works closely with those business units that have operating results below expectations to help the unit apply this 80/20 business process and improve their results.

Discontinued Operations

      Discontinued Operations represents the Company’s former Consumer Products segment which was comprised of the following businesses: Precor specialty exercise equipment, West Bend small appliances and premium cookware, and Florida Tile ceramic tile. The Company’s net loss on disposal of the segment was $0.9 million in 2004 and $16.5 million in 2003. In 2002, the Company recorded an estimated after-tax net gain on disposal of the segment of $2.4 million, which was deferred pending the completion of the sale of Florida Tile in 2003.

Current Year Developments

      Refer to pages 30 through 48, Management’s Discussion and Analysis, in the Company’s 2005 Annual Report to Stockholders.

Financial Information about Segments and Markets

      Segment and geographic data and operating results of the segments are included on pages 31 through 41 and 74 through 76 of the Company’s 2005 Annual Report to Stockholders.

      The principal end markets served by the Company’s four continuing manufacturing segments are as follows:

      The Company’s manufacturing businesses primarily distribute their products directly to industrial manufacturers and through independent distributors.

Backlog

      Backlog generally is not considered a significant factor in the Company’s businesses as relatively short delivery periods and rapid inventory turnover are characteristic of most of its products. Backlog by manufacturing segment as of December 31, 2005 and 2004 is summarized as follows:

      Backlog orders scheduled for shipment beyond calendar year 2006 were not material in any manufacturing segment as of December 31, 2005.

      The information set forth below is applicable to all industry segments of the Company unless otherwise noted:

Competition

      The Company’s global competitive environment is complex because of the wide diversity of products the Company manufactures and the many markets it serves. Depending on the product or market, the Company may compete with a few other companies or with many others. The Company is a leading producer of plastic and metal components and fasteners; laminate products; polymers and fluid products; automotive aftermarket maintenance and appearance products; welding products; packaging machinery and related consumables; equipment for materials testing; food service equipment; and industrial finishing equipment.

Raw Materials

      The Company uses raw materials of various types, primarily metals, plastics and paper, that are available from numerous commercial sources. The availability of materials and energy has not resulted in any significant business interruptions or other major problems, nor are any such problems anticipated.

Research and Development

      The Company’s growth has resulted from developing new and improved products, broadening the application of established products, continuing efforts to improve and develop new methods, processes and equipment, and from acquisitions. Many new products are designed to reduce customers’ costs by eliminating steps in their manufacturing processes, reducing the number of parts in an assembly, or by improving the quality of customers’ assembled products. Typically, the development of such products is accomplished by working closely with customers on specific applications. Identifiable research and development costs are set forth on page 54 of the Company’s 2005 Annual Report to Stockholders.

      The Company owns approximately 3,300 unexpired United States patents covering articles, methods and machines. Many counterparts of these patents have also been obtained in various foreign countries. In addition, the Company has approximately 1,200 applications for patents pending in the United States Patent Office, but there is no assurance that any patent will be issued. The Company maintains an active patent department for the administration of patents and processing of patent applications.

      The Company believes that many of its patents are valuable and important. Nevertheless, the Company credits its leadership in the markets it serves to engineering capability; manufacturing techniques, skills and efficiency; marketing and sales promotion; and service and delivery of quality products to its customers. The expiration of any one of the Company’s patents would not have a material effect on the Company’s results of operations or financial position.

Trademarks

      Many of the Company’s products are sold under various owned or licensed trademarks, which are important to the Company. Among the most significant are: ITW, Acme, Angleboard, Apex, Bernard, Binks, Buildex, Chemtronics, Corex, Deltar, Devcon, DeVilbiss, Dymon, Dynatec, Elga, Evercoat, Fastex, Forkardt, Foster, Gema, Hi-Cone, Hobart, Instron, Intellibuild, Keps, Krafft, LPS, Magna, Magnaflux, Miller, Mima, Minigrip, Nexus, Orgapack, Paktron, Paslode, Permatex, Pryda, Ramset, Ransburg, Red Head, Resopal, Rippey, Rockwell, Rocol, Shakeproof, Shore, Signode, Simco, Spiroid, Spit, Stero, Strapex, Teks, Tempil, Tenax, Texwipe, Traulsen, Truswal Systems, Tri-Mark, Unipac, Valeron, Vulcan, Wilsonart, Wynn’s and Zip-Pak.

Environmental

      The Company believes that its plants and equipment are in substantial compliance with applicable environmental regulations. Additional measures to maintain compliance are not expected to materially affect the Company’s capital expenditures, competitive position, financial position or results of operations.

      Various legislative and administrative regulations concerning environmental issues have become effective or are under consideration in many parts of the world relating to manufacturing processes and the sale or use of certain products. To date, such developments have not had a substantial adverse impact on the Company’s sales or earnings. The Company has made considerable efforts to develop and sell environmentally compatible products resulting in new and expanding marketing opportunities.

Employees

      The Company employed approximately 50,000 persons as of December 31, 2005 and considers its employee relations to be excellent.

International

      The Company’s international operations include subsidiaries, joint ventures and licensees in 47 countries on six continents. These operations serve such end markets as construction, automotive, food institutional and retail, general industrial, food and beverage, and others on a worldwide basis. The Company’s international operations contributed approximately 44% of operating revenues in 2005 and 2004.

      Refer to pages 30 through 48 and 74 through 76 in the Company’s 2005 Annual Report to Stockholders for additional information on international activities. International operations are subject to certain risks inherent in conducting business in foreign countries, including price controls, exchange controls, limitations on participation in local enterprises, nationalization, expropriation and other governmental action, and changes in currency exchange rates.

Forward-looking Statements

      This annual report on Form 10-K contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 including, without limitation, statements regarding availability of raw materials and energy, the expiration of any one of the Company’s patents, the cost of compliance with environmental regulations, the Company’s 2006 forecasts and assumptions, the adequacy of internally generated funds, the recoverability of the Company’s investment in mortgage entities, future cash flows and income from the Company’s mortgage investments, equipment leases, the meeting of dividend payout objectives, the impact of the repeal of the ETI benefit on the Company’s future U.S. tax payments, the impact of the American Jobs Creation Act of 2004, including the amount of U.S. pre-tax manufacturing income that would qualify as eligible income, payments under guarantees, the Company’s portion of future benefit payments related to pension and other postretirement benefits, the availability of additional financing and the outcome of outstanding legal proceedings. These statements are subject to certain risks, uncertainties, and other factors, which could cause actual results to differ materially from those anticipated. Important risks that may influence future results include (1) a downturn in the construction, automotive, general industrial, food institutional and retail, or real estate markets, (2) deterioration in global and domestic business and economic conditions, particularly in North America, the European Community, Asia or Australia, (3) the unfavorable impact of foreign currency fluctuations and costs of raw materials, (4) an interruption in, or reduction in, introducing new products into the Company’s product lines, (5) an unfavorable environment for making acquisitions, domestic and international, including adverse accounting or regulatory requirements and market values of candidates, and (6) unfavorable tax law changes and tax authority rulings. The risks covered here are not all inclusive and given these and other possible risks and uncertainties, investors should not place undue reliance on forward-looking statements as a prediction of actual results.

      ITW practices fair disclosure for all interested parties. Investors should be aware that while ITW regularly communicates with securities analysts and other investment professionals, it is against ITW’s policy to disclose to them any material non-public information or other confidential commercial information. Shareholders should not assume that ITW agrees with any statement or report issued by any analyst irrespective of the content of the statement or report.

Executive Officers

      Executive Officers of the Company as of February 24, 2006 were as follows:

      The executive officers of the Company serve at the pleasure of the Board of Directors. Except for Messrs. Callahan, Campbell, Hindman, Kropp, Osterkorn, Santi, and Wooten, each of the foregoing officers has been employed by the Company in various elected executive capacities for more than five years. Mr. Callahan was elected Senior Vice President in 2002. He joined the Company in 1976 and has served the Company in various human resource capacities over the last 29 years. Mr. Campbell was elected Executive Vice President in 2004. He joined the Company in 1981 and served as president of various packaging and printing businesses since 1986. Mr. Hindman was elected Executive Vice President in 2004. He joined the Company in 1976 and has held various sales, marketing and general management positions with the construction products businesses. Mr. Kropp was designated Principal Accounting Officer in 2005. He joined the Company in 1993. He has held various financial management positions and was appointed as Vice President and Controller, Financial Reporting in 2002. Mr. Osterkorn was appointed Vice President and Controller, Operations in 2005. He joined the Company in 1988 and has held various financial management positions with the automotive and packaging businesses. Mr. Santi was elected Executive Vice President in 2004. He joined the Company in 1983 and has held various sales, marketing and general management positions with the construction products, machined components and welding businesses during his 23 years with the Company. Mr. Wooten was elected Vice President, General Counsel and Corporate Secretary in 2005. He joined the Company in 1988 and has held positions of increasing responsibility in the legal department over the last 17 years.

Internet Information

      Copies of the following information are available free of charge through the Company’s website (www.itw.com) as soon as reasonably practicable after the Company electronically files the material with, or furnishes it to, the Securities and Exchange Commission and are available in print to any shareholder who requests it:

      Not applicable.

      Not applicable.

      As of December 31, 2005, the Company operated the following plants and office facilities, excluding regional sales offices and warehouse facilities:

      The principal plants outside of the U.S. are in Australia, Austria, Belgium, Brazil, Canada, China, Czech Republic, Denmark, France, Germany, Ireland, Italy, Spain, Switzerland and the United Kingdom.

      The Company’s properties are primarily of steel, brick or concrete construction and are maintained in good operating condition. Productive capacity, in general, currently exceeds operating levels. Capacity levels are somewhat flexible based on the number of shifts operated and on the number of overtime hours worked. The Company adds productive capacity from time to time as required by increased demand. Additions to capacity can be made within a reasonable period of time due to the nature of the businesses.

      Wilsonart International, Inc. (“Wilsonart”), a wholly owned subsidiary of ITW, is a defendant in a consolidated class action lawsuit filed in June 2000 in U.S. federal district court in White Plains, New York on behalf of purchasers of high-pressure laminate. The complaint alleges that Wilsonart participated in a conspiracy with competitors to fix, raise, maintain or stabilize prices for high-pressure laminate between 1994 and 2000 and seeks injunctive relief and treble damages. Indirect purchasers of high-pressure laminate filed similar purported class action cases under various state antitrust and consumer protection statutes in 13 states and the District of Columbia, all of which cases have been stayed pending the outcome of the consolidated class action. These lawsuits were brought following the commencement of a federal grand jury investigation into price-fixing in the high-pressure laminate industry, which investigation was subsequently closed by the Department of Justice with no further proceedings and with all documents being returned to the parties. Plaintiffs are seeking damages of $470,000,000 before trebling. Without admitting liability, Wilsonart’s co-defendants, International Paper Company and Panolam International, Inc., have settled the federal consoli-

dated class action case for $31,000,000 and $9,500,000, respectively. The plaintiffs’ claims against Formica Corporation, the remaining co-defendant in the case, were dismissed with prejudice on September 27, 2004 as a result of its bankruptcy proceedings. As a result, Wilsonart is the sole remaining defendant in the consolidated class action lawsuit. While no assurances can be given regarding the ultimate outcome or the timing of the resolution of these claims, the Company believes that the plaintiffs’ claims are without merit and intends to continue to defend itself vigorously in this action and all related actions that are now pending or that may be brought in the future.

      Not applicable.

PART II

      Market information, holders of record and dividend data is incorporated by reference to page 77 of the Company’s 2005 Annual Report to Stockholders.

      Effective January 1, 2005 the Company adopted Statement of Financial Accounting Standards No. 123 (revised 2004), Share Based Payment (“SFAS 123R”), which requires the Company to measure the cost of employee services received in exchange for equity awards based on the grant date fair value. Refer to pages 72 through 74 of the Company’s 2005 Annual Report to Stockholders for discussion of the effect of the change in accounting principle.

      On July 1, 2003, the Company adopted FASB Interpretation No. 46, Consolidation of Variable Interest Entities (“FIN 46”) relative to its investments in the mortgage entities. Refer to pages 60 and 61 of the Company’s 2005 Annual Report to Stockholders for discussion of the adoption of FIN 46.

      Effective January 1, 2002, the Company adopted Statement of Financial Accounting Standards No. 142, Goodwill and Other Intangible Assets. Under SFAS 142, the Company does not amortize goodwill and intangible assets that have indefinite lives. SFAS 142 also requires that the Company assess goodwill and intangible assets with indefinite lives for impairment at least annually, based on the fair value of the related reporting unit or intangible asset.

      This information is incorporated by reference to pages 30 through 48 of the Company’s 2005 Annual Report to Stockholders.

      This information is incorporated by reference to pages 46 and 47 of the Company’s 2005 Annual Report to Stockholders.

      The financial statements and report thereon of Deloitte & Touche LLP dated February 24, 2006, as found on pages 50 through 76 and the supplementary data as found on page 77 of the Company’s 2005 Annual Report to Stockholders, are incorporated by reference. The unaudited interim financial statements included as supplementary data reflect all adjustments that are, in the opinion of management, necessary to a fair statement of the results for the interim periods presented.

      Not applicable.

Controls and Procedures

      The Company’s management, with the participation of the Company’s President and Chief Executive Officer and Vice President and Controller, Financial Reporting, has evaluated the effectiveness of the Company’s disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e)) as of December 31, 2005. Based on such evaluation, the Company’s President and Chief Executive Officer and Vice President and Controller, Financial Reporting have concluded that, as of December 31, 2005, the Company’s disclosure controls and procedures were effective in timely alerting the Company’s management to all information required to be included in this Form 10-K and other Exchange Act filings.

Management’s Report on Internal Control over Financial Reporting

      The Management Report on Internal Control Over Financial Reporting, as found on page 49 of the Company’s 2005 Annual Report to Stockholders, is incorporated by reference.

      The Company’s Report of Independent Registered Public Accounting Firm, as found on page 50 of the Company’s 2005 Annual Report to Stockholders, is incorporated by reference.

      In connection with the evaluation by management, including the Company’s President and Chief Executive Officer and Vice President and Controller, Financial Reporting, no changes in the Company’s internal control over financial reporting (as defined in Exchange Act Rule 13a-15(f)) during the quarter ended December 31, 2005 were identified that have materially affected or are reasonably likely to materially affect the Company’s internal control over financial reporting.

      Not applicable.

PART III

      Information regarding the Directors of the Company is incorporated by reference to the information under the caption “Election of Directors” in the Company’s Proxy Statement for the 2006 Annual Meeting of Stockholders.

      Information regarding the Audit Committee and its Financial Experts is incorporated by reference to the information under the caption “Board of Directors and Its Committees” and “Report of the Audit Committee” in the Company’s Proxy Statement for the 2006 Annual Meeting of Stockholders.

      Information regarding the Executive Officers of the Company can be found in Part I of this Annual Report on Form 10-K on page 11.

      Information regarding compliance with Section 16(a) of the Exchange Act is incorporated by reference to the information under the caption “Section 16(a) Beneficial Ownership Reporting Compliance” in the Company’s Proxy Statement for the 2006 Annual Meeting of Stockholders.

      Information regarding the Company’s code of ethics that applies to the Company’s President and Chief Executive Officer, Vice President and Controller, Financial Reporting, and key financial and accounting personnel is incorporated by reference to the information under the caption “Corporate Governance Policies and Practices” in the Company’s Proxy Statement for the 2006 Annual Meeting of Stockholders.

      This information is incorporated by reference to the information under the captions “Executive Compensation” and “Director Compensation” in the Company’s Proxy Statement for the 2006 Annual Meeting of Stockholders.

      This information is incorporated by reference to the information under the captions “Ownership of ITW Stock” and “Equity Compensation Plan Information” in the Company’s Proxy Statement for the 2006 Annual Meeting of Stockholders.

      This information is incorporated by reference to the information under the caption “Ownership of ITW Stock” in the Company’s Proxy Statement for the 2006 Annual Meeting of Stockholders.

      This information is incorporated by reference to the information under the caption “Ratification of the Appointment of Independent Public Accountants” in the Company’s Proxy Statement for the 2006 Annual Meeting of Stockholders.

PART IV

     (a)(1) Financial Statements

      The financial statements and report thereon of Deloitte & Touche LLP dated February 24, 2006 as found on pages 50 through 76 and the supplementary data as found on page 77 of the Company’s 2005 Annual Report to Stockholders, are incorporated by reference.

            (2) Financial Statement Schedules

      Not applicable.

            (3) Exhibits

                    (i)     See the Exhibit Index on pages 18 and 19 of this Form 10-K.

                    (ii) Pursuant to Regulation S-K, Item 601(b)(4)(iii), the Company has not filed with Exhibit 4 any debt instruments for which the total amount of securities authorized thereunder are less than 10% of the total assets of the Company and its subsidiaries on a consolidated basis as of December 31, 2005, with the exception of the agreements related to the 5³/4% Note and the indenture related to the 6⁷/8% Note, which are filed with Exhibit 4. The Company agrees to furnish a copy of the agreements related to the debt instruments which have not been filed with Exhibit 4 to the Securities and Exchange Commission upon request.

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 on this 24th day of February 2006.

      Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons on behalf of the registrant and in the capacities indicated on this 24th day of February 2006.

      Original powers of attorney authorizing David B. Speer to sign the Company’s Annual Report on Form 10-K and amendments thereto on behalf of the above-named directors of the registrant have been filed with the Securities and Exchange Commission as part of this Annual Report on Form 10-K (Exhibit 24).

EXHIBIT INDEX

ANNUAL REPORT on FORM 10-K

2005