Keyless Rigid Coupling Coupling Length 4.1 in Coupling Material Carbon Steel Included Screws 6.69 in For Motion Type 10 Zero Backlash Inch Screw Material 3 in Maximum Speed 3 in Resistance Properties Round Maximum Torque 3.7 in Fastener Tightening Torque 11 599 ft-lb Outside Diameter Oil Dipped Overhung Load Capacity +0.000 in / -0.006 in Bore Type 74 ft-lb System of Measurement Metric Length through Bore (10) Locking Screw Screw Length 80 mm Number of Locking Screws M12