Keyless Rigid Coupling Coupling Length 2.21 in Coupling Material Carbon Steel Included Screws 3.78 in For Motion Type 7 Zero Backlash Inch Screw Material 1 11/16 in Maximum Speed 1.69 in Resistance Properties Round Maximum Torque 1.97 in Fastener Tightening Torque 2 021 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 (7) Locking Screw Screw Length 45 mm Number of Locking Screws M8