EXHIBIT 21.1

Subsidiaries of Altra Industrial Motion, Inc.

Name of Subsidiary	Jurisdiction of Organization
•  American Enterprises MPT Corp.	Delaware
•  Nuttall Gear L L C	Delaware
•  American Enterprises MPT Holdings, L.P.(1)	Delaware
•  Ameridrives International, L.P.(2)	Delaware
•  Boston Gear LLC	Delaware
•  The Kilian Company	Delaware
•  Kilian Manufacturing Corporation	Delaware
•  3091780 Nova Scotia Company	Nova Scotia, Canada
•  Kilian Canada, ULC	Nova Scotia, Canada
•  Warner Electric LLC	Delaware
•  Formsprag LLC(3)	Delaware
•  Warner Electric Technology LLC	Delaware
•  Warner Electric International Holding, Inc.	Delaware
•  Warner Electric UK Group Ltd.	United Kingdom
•  Warner Electric UK Holding Ltd.	United Kingdom
•  Wichita Company Ltd.	United Kingdom
•  Warner Electric (Holdings) SAS	France
•  Warner Electric Europe SAS	France
•  Warner Electric Group GmbH	Germany
•  Warner Electric Verwaltungs GmbH	Germany
•  Stieber GmbH	Germany
•  Warner Electric (Netherlands) Holding, B.V.	Netherlands
•  Warner Electric Australia Pty. Ltd.	Australia
•  Warner Shui Hing Limited	Hong Kong
•  Warner Electric (Singapore) Ltd.	Singapore
•  Warner Electric (Taiwan) Ltd.	Taiwan
•  Warner Electric (Thailand) Ltd.	Thailand

(1) Altra Industrial Motion, Inc. owns 40.6% and American Enterprises MPT Corp. owns 59.4%.

(2) American Enterprises MPT Holdings, L.P. owns 99% and American Enterprises MPT Corp. owns 1%.

(3) Warner Electric LLC owns 70% and Ameridrives International, L.P. owns 30%.