Starting shock from electric motors is a major cause of maintenance of moving parts. Torque-limiter clutches provide a cushion by slipping until the torque drops to a pre-set level. They can be set to reduce shock loads on motors and driven equipment during reversing or inching. They provide mechanical protection against breakage due to sudden overload by slipping when the pre-set torque limit is reached. Martin can provide many tooth counts that are not listed by quickly altering stock sprockets. Martin Torque Limiter Sprocket Bushing, For Use With: TT50 Torque Limiter, Steel