Keyless Rigid Coupling Coupling Length 3.46 in Coupling Material Carbon Steel Included Screws 5.83 in For Motion Type 12 Zero Backlash Inch Screw Material 2 7/8 in Maximum Speed 2.88 in Resistance Properties Round Maximum Torque 3.15 in Fastener Tightening Torque 9 197 ft-lb Outside Diameter Oil Dipped Overhung Load Capacity +0.000 in / -0.006 in Bore Type 44 ft-lb System of Measurement Metric Length through Bore (12) Locking Screw Screw Length 65 mm Number of Locking Screws M10