Exhibit 21.1

 

|                                                                                                         |        |                                         |                     |        |  |  |
|---------------------------------------------------------------------------------------------------------|--------|-----------------------------------------|---------------------|--------|--|--|
|                                                                                                    |   | Jurisdiction of Incorporation |                |
| Altra Industrial Motion Corp.,                                                                          |   |                                    | Delaware            |   |
| - Guardian Couplings LLC,                                                                               |   |                                    | Delaware            |   |
| - Nuttall Gear LLC,                                                                                     |   |                                    | Delaware            |   |
| - Ameridrives International LLC,                                                                        |   |                                    | Delaware            |   |
| - Formsprag LLC,                                                                                        |   |                                    | Delaware            |   |
| - Warner Electric LLC,                                                                                  |   |                                    | Delaware            |   |
| - Warner Electric Technology LLC,                                                                       |   |                                    | Delaware            |   |
| - Svendborg Brakes USA, LLC                                                                             |   |                                    | Delaware            |   |
| - Boston Gear LLC,                                                                                      |   |                                    | Delaware            |   |
| - Bauer Gear Motor LLC,                                                                                 |   |                                    | Delaware            |   |
| - Inertia Dynamics LLC,                                                                                 |   |                                    | Delaware            |   |
| - Kilian Manufacturing Corporation,                                                                     |   |                                    | Delaware            |   |
| - Kilian Canada ULC,                                                                                    |   |                                    | 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              |   |
|           - Altra Industrial Motion (Thailand) Ltd.,  |   |                                    | Thailand            |   |
| - Stevens Holding Company Inc.,                                                                         |   |                                    | Delaware            |   |
| - AS Motion LLC,                                                                                        |   |                                    | Delaware            |   |
| - AS Motion North America Inc.,                                                                         |   |                                    | Delaware            |   |
|         - G&L Motion Control Inc.,                          |   |                                    | Delaware            |   |
|         - Thomson Linear LLC,                                   |   |                                    | Delaware            |   |
|         - American Precision Industries, Inc.,                  |   |                                    | Delaware            |   |
|       - Portescap U.S., Inc.,                                             |   |                                    | New York            |   |
|       - Heat Transfer Guarantee Co., LLC,                                 |   |                                    | Delaware            |   |
|       - API Harowe (St. Kitts) Ltd.,                                      |   |                                    | St. Kitts and Nevis |   |
|       - Portescap S.A.,                                                   |   |                                    | Switzerland         |   |
|         - Portescap International S.A.,                         |   |                                    | Switzerland         |   |
|           - Portescap Co., Ltd.,                      |   |                                    | Japan               |   |
|         - Motion Engineering Incorporated,                      |   |                                    | California          |   |
|         - Ball Screws and Actuators Co., Inc.,                  |   |                                    | California          |   |
|         - Wermex Corporation,                                   |   |                                    | Texas               |   |
|         - Thomson Industries, Inc.                              |   |                                    | New York            |   |
|       - ABEK LLC,                                                         |   |                                    | Delaware            |   |
|       - Thomson Industries S. de R.L. de C.V.,                            |   |                                    | Mexico              |   |
| - Jacobs Vehicle Systems, Inc.,                                                                         |   |                                    | Delaware            |   |
| - PacSci Motion Control, Inc.,                                                                          |   |                                    | Massachusetts       |   |
|         - Kollmorgen Corporation,                               |   |                                    | New York            |   |
|         - TGA Motion AB,                                        |   |                                    | Sweden              |   |
| - AS Motion International B.V.,                                                                         |   |                                    | Netherlands         |   |
|         - Elsim Elektroteknik Sistemler Sanayi ve Ticaret A.S., |   |                                    | Turkey              |   |
|         - AS Motion Hong Kong Ltd.,                             |   |                                    | Hong Kong           |   |
| - ASM Business Services LLC,                                                                            |   |                                    | Delaware            |   |
| - Altra Industrial Motion International Holding, Inc.,                                                  |   |                                    | Delaware            |   |
| - Altra Industrial Motion Netherlands C.V.,                                                             |   |                                    | Netherlands         |   |
| - Altra Industrial Motion Netherlands B.V.,                                                             |   |                                    | Netherlands         |   |
|         - Warner Electric Group GmbH,                           |   |                                    | Germany             |   |
|        - Kollmorgen s.r.o.,                                          |   |                                    | Czech Republic      |   |
| - Kollmorgen s.r.l.,                                                                                    |   |                                    | Italy               |   |
| - Jacobs Vehicle Systems Europe s.r.o.,                                                                 |   |                                    | Czech Republic      |   |
|        - Thomson Neff Industries GmbH,                               |   |                                    | Germany             |   |
|        - Kollmorgen Automation AB,                                   |   |                                    | Sweden              |   |
| - Tollo Linear AB,                                                                                      |   |                                    | Sweden              |   |
|        - Kollmorgen Europe GmbH,                                     |   |                                    | Germany             |   |
|        - Stieber GmbH,                                               |   |                                    | Germany             |   |
|        - Stromag Holding GmbH,                                       |   |                                    | Germany             |   |
|     - Stromag GmbH,                                                                 |   |                                    | Germany             |   |
|     - Stromag Dessau GmbH,                                                          |   |                                    | Germany             |   |
|       - Altra Industrial Motion India Private Ltd.,                       |   |                                    | India               |   |

----

|                                                                                            |           |        |                |        |  |  |
|--------------------------------------------------------------------------------------------|-----------|--------|----------------|--------|--|--|
|         - Warner Electric (Neth) Holding B.V.,     |      |   | Netherlands    |   |
|       - Altra Industrial Motion Australia Pty. Ltd.,         |      |   | Australia      |   |
|       - Altra Industrial Motion Hong Kong Limited            |      |   | Hong Kong |   |
|     - Altra Industrial Motion (ShenZhen) Co., Ltd.,                    |      |   | China          |   |
|       - Altra Industrial Motion Singapore Pte. Ltd.,         |      |   | Singapore      |   |
|       - Altra Industrial Motion Taiwan Ltd.,                 |      |   | Taiwan         |   |
|       - Altra Industrial Motion Switzerland GmbH             |      |   | Switzerland    |   |
|         - Altra Industrial Motion UK Holding Ltd., |      |   | United Kingdom |   |
|       - Altra Industrial Motion UK Ltd.,                     |      |   | United Kingdom |   |
| - Matrix International Ltd.,                                                               |      |   | United Kingdom |   |
| - Matrix International GmbH,                                                               |      |   | Germany        |   |
| - Bauer Gear Motor Ltd.,                                                                   |      |   | United Kingdom |   |
| - Stromag UK Ltd.,                                                                         |      |   | United Kingdom |   |
| - Twiflex Ltd.,                                                                            |      |   | United Kingdom |   |
| - Huco Engineering Industries Ltd.,                                                        |      |   | United Kingdom |   |
| - Bibby Transmissions Ltd.,                                                                |      |   | United Kingdom |   |
| - Altra Industrial Motion South Africa (Pty.) Ltd.,                                        |      |   | South Africa   |   |
|       - AS Motion Asiapac Holding Ltd.,                      |      |   | Hong Kong      |   |
| - A&S Industry Technology (Tianjin) Co., Ltd.,                                         |      |   | China          |   |
| - Portescap Singapore Pte., Ltd.,                                                          |      |   | Singapore      |   |
| - Portescap India Private Limited,                                                         |      |   | India          |   |
| - AS Motion Investment Ltd.,                                                               |      |   | Cayman Islands |   |
| - Jacobs (Suzhou) Vehicle Systems Co., Ltd.,                                               |      |   | China          |   |
| - Bauer Gear Motor GmbH,                                                                   | Germany   |   |
| - Bauer Gear Motor Europe GmbH,                                                            | Germany   |   |
| - Bauer Gear Motor Slovakia s.r.o.,                                                        | Germany   |   |
| - Aluminium Die Casting S.r.L.,                                                            | Italy     |   |
| - Bauer Gear Motor Finland Oy Ab,                                                          | Finland   |   |
| - Altra Industrial Motion Russia OOO,                                                      | Russia    |   |
| - Warner Electric (Holding) SAS,                                                           | France    |   |
| - Warner Electric Europe SAS,                                                              | France    |   |
| - Stromag Holding SAS,                                                                     | France    |   |
| - Stromag France SAS,                                                                      | France    |   |
| - Altra Industrial Motion do Brasil Equipamentos Industriais Ltda.,                        | Brazil    |   |
| - Altra Industrial Motion Denmark ApS,                                                     | Denmark   |   |
| - S.B. Patent Holding ApS,                                                                 | Denmark   |   |
| - Svendborg Brakes ApS,                                                                    | Denmark   |   |
| - Svendborg Brakes Espana S.A.,                                                            | Spain     |   |
| - Svendborg Brakes Australia Pty. Ltd.,                                                    | Australia |   |
| - Svendborg Brakes Korea Co. Ltd.,                                                         | Korea     |   |
| - Svendborg Brakes Chile Ltd.,                                                             | Chile     |   |
| - Svendborg Brakes India Ltd.,                                                             | India     |   |
| - Svendborg Brakes Shanghai Co. Ltd.,                                                      | China     |   |
| - Svendborg Brakes Trading (Shanghai) Co. Ltd.,                                            | China     |   |
| - Svendborg Brakes Peru S.A.C.                                                             | Peru      |   |