Keyless Rigid Coupling Coupling Length 3.07 in Coupling Material Carbon Steel Included Screws 4.72 in For Motion Type 12 Zero Backlash Inch Screw Material 2 3/16 in Maximum Speed 2.19 in Resistance Properties Round Maximum Torque 2.76 in Fastener Tightening Torque 4 490 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 (12) Locking Screw Screw Length 55 mm Number of Locking Screws M8