Exhibit 21.1

Jurisdiction of Incorporation

	September 30,
Altra Holdings, Inc.,	Delaware
- Altra Industrial Motion, Inc.,	Delaware
- Nuttall Gear LLC,	Delaware
- Ameridrives International, LLC,	Delaware
- Formsprag LLC,	Delaware
- Warner Electric LLC,	Delaware
- Warner Electric Technology LLC,	Delaware
- Boston Gear LLC,	Delaware
- Bauer Gear Motor LLC,	Delaware
- Inertia Dynamics, LLC,	Delaware
- Kilian Manufacturing Corporation,	Delaware
- Kilian Canada, ULC,	Nova Scotia, Canada
- TB Wood’s Corporation,	Delaware
- TB Wood’s Incorporated,	Pennsylvania
- T.B. Wood’s Canada Ltd.,	Canada
- Industrial Blaju, S.A. de C.V.,	Mexico
- Warner Electric International Holding, Inc.,	Delaware
- Warner Electric Group GmbH,	Germany
- Stieber GmbH,	Germany
- Warner Electric (Netherlands) Holding, B.V.,	Netherlands
- Warner Electric Australia Pty. Ltd.,	Australia
- Warner Shui Hing Limited, (HK),	Hong Kong
- Warner Electric (Singapore), Ltd.,	Singapore

	September 30,
- Warner Electric (Taiwan) Ltd.,	Taiwan
- Warner Electric (Thailand) Ltd.,	Thailand
- Altra Industrial Motion (ShenZhen) Co., Ltd.,	China
- Warner Electric B.V.,	Netherlands
- Warner Electric UK Group Ltd.,	United Kingdom
- Warner Electric UK Holding, Ltd.,	United Kingdom
- Wichita Company Ltd.,	United Kingdom
- Hay Hall Holdings Ltd.,	United Kingdom
- The Hay Hall Group Ltd.,	United Kingdom
- Matrix International, Ltd.,	United Kingdom
- Matrix International GmbH,	Germany
- Bibby Group Ltd.,	United Kingdom
- Bibby Transmissions Ltd.,	United Kingdom
- Bibby Turboflex SA,	South Africa
- Turboflex Ltd.,	United Kingdom

	September 30,
- Torsiflex Ltd.,	United Kingdom
- Huco Power Transmission, Ltd.,	United Kingdom
- Huco Engineering Industries Ltd.,	United Kingdom
- Dynatork Air Motors Ltd.,	United Kingdom
- Dynatork, Ltd.,	United Kingdom
- Twiflex Ltd.,	United Kingdom
- Saftek Ltd.,	United Kingdom
- Bauer Gear Motor Limited,	United Kingdom
- Altra Industrial Motion Netherlands C.V.,	Netherlands
- Altra Industrial Motion Netherlands B.V.,	Netherlands
- Bauer Gear Motor GmbH,	Germany
- Bauer Gear Motor Europe, GmbH,	Germany
- Bauer Gear Motor Slovakia, s.r.o.,	Germany
- Bauer Gear Motor Finland Oy Ab,	Finland
- Altra Industrial Motion Russia OOO,	Russia
- Altra Industrial Motion Ukraine TOV,	Ukraine
- Altra Industrial Motion (Changzhou) Co., Ltd.	China
- Warner Electric (Holding) SAS,	France
- Warner Electric Europe SAS,	France