The PB Series Clutch features precision formed cams which provide high torque capacities size-for-size combined with excellent wear life. These models are suitable for general purpose applications- overrunning, indexing, and backstopping. They have a bronze bearing to maintain race concentricity. All but the smallest size has sealed construction and a snap ring groove, as well as keyed extension to attach a gear or sheave. They can be lubricated with either grease or oil. They are asymmetrical by design, so they must be ordered according to application rotation requirements. See the specifications for details.