Jeysons MDC Series multi disc clutches are available in air actuated & spring released and also spring engaged & air released mozdels and have the following characteristics. Torque range from 3 to 6779 Nm (20 - 60,000 in. lbs.) . Bore Size from 13 - 100mm (0.625 to 3.938 inches) . Air engaged spring released models. Single or Multi-position models. Fast response time. Inch and Metric models available. Varialble mounting options on either the motor or driven shaft with a pulley, sprocket or flexible coupling on the pilot.