Formsprag FS-200/CL4009-2A Overrunning Clutch

The Formsprag FS-200/CL4009-2A is a compact overrunning clutch designed for industrial power transmission applications. This sprag-type clutch allows free rotation in one direction while preventing reverse rotation, making it ideal for backstopping, indexing, and overrunning functions in machinery such as conveyors, pumps, and fans. Manufactured by Formsprag, a Dana Incorporated brand, it features high torque capacity in a small footprint, with precision sprags for reliable engagement and disengagement. Benefits include low maintenance, high durability in harsh environments, and compatibility with various shaft sizes via its bored design. Drawbacks may include the need for proper lubrication (as indicated on the unit: use D.T.E. light oil for indexing clutches or heavy medium oil for overrunning) and potential wear in high-speed applications if not maintained. Compared to similar products like those from Stieber or Ringspann, the FS-200 offers superior torque-to-size ratio and easier installation. This unit appears to be in used condition with minor surface wear and dirt, but remains functional with intact bearings and no visible damage. Applications span manufacturing, mining, and material handling industries. For optimal performance, refer to manufacturer guidelines on lubrication and mounting.