• Integral single, double or triple "O" ring pulley
  • Designed for .103 diameter "O" rings
  • Long life under controlled slip conditions
  • Unidirectional or bidirectional operation
  • Same or different CW and CCW torques
  • Precise and stable limit torque calibration
  • Same torque at breakaway as at high slip velocities
  • Corrosion resistant materials
  • Tension control of film or tape drives
  • Transmission overload protection
Federal supply code - 15531
Unit of Measure


Upper Limit Torque (oz·in)1 N/A 9.0

A + .0010 (in)

N/A .2500

Additional Information

OP series slip clutches are designed for transmissions utilizing precision "O" ring belts and requiring precise overload protection as in tape drives and other similar drives.

OP Series Slip Clutches are designed for long life under continuous slip conditions. The useful life of these elements is a function of the transmitted torque and slip speed. Service life expectancy is 1 - 2 million slip revolutions, increasing to 5 - 10 million slip revolutions if heat treated.

  • 1 Stock units are calibrated with equal CW and CCW slip torques corresponding to the tabulated Upper Limit Torques. Other torques are readily available from full, down to 1/8 of the Upper Limit Torque for each model.