A. O. Smith (AOS) 10-Q 2005 Q2 Quarterly report

Exhibit 32

Written Statement of the Chief Executive Officer and the

Principal Financial Officer Pursuant to 18 U.S.C. Section 1350

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, each of the undersigned certifies that to the best of our knowledge:

(1) the Quarterly Report on Form 10-Q of A. O. Smith Corporation for the quarter ended June 30, 2005 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of A. O. Smith Corporation.

Date: August 2, 2005

/s/ Robert J. O’Toole

Robert J. O’Toole

Chairman and Chief Executive Officer

/s/ John J. Kita

John J. Kita

Vice President, Treasurer and Controller