Keyless Rigid Coupling Coupling Length 2.68 in Coupling Material Carbon Steel Included Screws 4.41 in For Motion Type 10 Zero Backlash Inch Screw Material 2 in Maximum Speed 2 in Resistance Properties Round Maximum Torque 2.36 in Fastener Tightening Torque 3 421 ft-lb Outside Diameter Oil Dipped Overhung Load Capacity +0.000 in / -0.006 in Bore Type 22 ft-lb System of Measurement Metric Length through Bore (10) Locking Screw Screw Length 50 mm Number of Locking Screws M8