Altra Industrial Motion (AIMC) 10-Q 2009 Q3 Quarterly report

Exhibit 32.1

Certification of Chief Executive Officer

In connection with the Quarterly Report of Altra Holdings, Inc. (the “Company”) onForm 10-Q for the period ended September 26, 2009 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Carl R. Christenson, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002 (“Section 906”), that to the best of my knowledge:

1. The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:  /s/  Carl R. Christenson

Name:     Carl R. Christenson

Title:  President and Chief Executive Officer

Date: November 4, 2009