Keyless Rigid Coupling Coupling Length 1.89 in Coupling Material Carbon Steel Included Screws 2.99 in For Motion Type 8 Zero Backlash Inch Screw Material 1 1/4 in Maximum Speed 1.25 in Resistance Properties Round Maximum Torque 1.65 in Fastener Tightening Torque 891 ft-lb Outside Diameter Oil Dipped Overhung Load Capacity +0.000 in / -0.006 in Bore Type 9 ft-lb System of Measurement Metric Length through Bore (8) Locking Screw Screw Length 40 mm Number of Locking Screws M6