Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, on this 28th day of February, 2001, that each person whose signature appears below hereby constitutes and appoints John L. Howard and Kenneth S. Kirsner, and each of them, severally, as his or her true and lawful attorney-in-fact and agent, for him or her and in his or her name, place and stead, in any and all capacities, with full power to act alone, to sign a registration statement on Form S-8 relating to the W.W. Grainger, Inc. executive stock purchase program and any and all amendments thereto, and to file such registration statement and each such amendment with all exhibits thereto, and any and all documents in connection therewith, with the Securities and Exchange Commission, hereby granting unto said attorney-in-fact and agent full power and authority to do and perform any and all acts and things requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. IN WITNESS WHEREOF, each of the undersigned has subscribed these presents. /s/ R. L. Keyser /s/ David W. Grainger - ------------------------------ ------------------------------ R. L. Keyser David W. Grainger Chairman of the Board and Director Chief Executive Officer (Principal Executive Officer and a Director) /s/ P. O. Loux /s/ John W. McCarter, Jr. - ------------------------------ ------------------------------ P. O. Loux John W. McCarter, Jr. Senior Vice President, Finance Director and Chief Financial Officer (Principal Financial Officer) /s/ R. D. Pappano /s/ Neil S. Novich - ------------------------------ ------------------------------ R. D. Pappano Neil S. Novich Vice President, Financial Director Reporting (Principal Accounting Officer) /s/ Brian P. Anderson /s/ James D. Slavik - ------------------------------ ------------------------------ Brian P. Anderson James D. Slavik Director Director /s/ Harold B. Smith - ------------------------------ Harold B. Smith Director 25 /s/ Fred L. Turner /s/ Wilbur H. Gantz - ------------------------------ ------------------------------ Fred L. Turner Wilbur H. Gantz Director Director /s/ Janiece S. Webb - ------------------------------ Janiece S. Webb Director 26