Keyless Rigid Coupling Coupling Length 78 mm Coupling Material Carbon Steel Included Screws 119.9 mm For Motion Type 12 Zero Backlash Metric Screw Material 55 mm Maximum Speed 55 mm Resistance Properties Round Maximum Torque 70.1 mm Fastener Tightening Torque 6 027 N-m Outside Diameter Oil Dipped Overhung Load Capacity +0.000 mm / -0.152 mm Bore Type 30 N-m System of Measurement Metric Length through Bore (12) Locking Screw Screw Length 55 mm Number of Locking Screws M8