Keyless Rigid Coupling Coupling Length 1.73 in Coupling Material Carbon Steel Included Screws 2.6 in For Motion Type 7 Zero Backlash Inch Screw Material 1 1/16 in Maximum Speed 1.06 in Resistance Properties Round Maximum Torque 1.5 in Fastener Tightening Torque 662 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 (7) Locking Screw Screw Length 35 mm Number of Locking Screws M6