Reducer backstop made by sprag cam clutch, lower speed abut higher torque. BJ series backstop used for speed reducer,there are BJ35-100,BJ39-100,BJ45-120,BJ60-140 four size,1.BJ30-64Length :22.5mmInner race diameter:30mmKeyway size:8mm*3mmOuter race diameter:98mmMounting tap hole:diameter is 8.6mm,3 tap holes,PCD is 84.4mmTorque:400N.mOverrunning speed:1600r/m2.BJ40-90Length :22.5mmInner race ...