Stieber Clutch Bearing Freewheels Available :- Stieber, part of the Altra Industrial Motion Group is together with its sister companies Formsprag and Marland in USA the world's market leader for overrunning clutch and backstops. Our core business activity is the design and production of drive elements for mechanical engineering systems. Our major strength is the development and production of overrunning clutches and backstops, which transmit torque by means of friction. AS Series Bearing ASNU Series Bearing DC Series Bearing CSK Series Bearing CSK P and CSK PP Series Bearing