1-3/8" 6 Spline Ends Adjustable Rotary Cutter Slip Clutch for PTO Shaft Feature:1. Allow Two Speeds: Our PTO slip clutch limits the amount of torque being transferred from the tractor to the implement. This is accomplished by slipping or spinning free, which allows the two sides of the PTO shaft to spin at different speeds2. Quality PTO Slip Clutch: The 20 Cr Mn Ti carburized steel which built this tractor PTO slip clutch has been reinforced to resist impact. The black-painted surface is smooth and anti-weary. So, it can withstand higher torque and speed to gain better protection for your PTO shaft.3. 1-3/8" x 6 Spline Ends: Constructed with 6-spline ends, this PTO clutch has a standard size of 1-3/8" for both male and female ends. It perfectly matches the same diameter of implement input shaft and tractor output shaft, featuring superior safety functions as shear bolts.Easy Torque Adjustments: Rated torque: 900 nm, adjustment range: 20 - 55 hp. You can adjust the length of the tension springs to acquire an appropriate torque for your rotary cutter slip clutch. Just tight / loose the eight nuts by 1/4 of a turn and check its tightness for correct operation.4. Replaceable Friction Discs: The PTO slip clutch adopts an essential spring and disc set-up. It is assembled with fiction discs inside to help transmit forces. It is most commonly used on rotary tilling attachments like rotary cutters, brush cutters, rotary mowers, and tractors.Specification:Material: 20 Cr Mn Ti Carburized Steel Surface Finishing: Painted Female & Male End Size: 1-3/8" 6 Spline Tension Springs: Adjustable Friction Discs: Replaceable Rated Torque: 900 nm Adjustment Range: 20 - 55 Horse Power Application:Fit For Rotary Cutter, Brush Cutter, Rotary Mower, Tractor