Rigid Shaft Coupling Bore Diameter 1 6 mm Bore Diameter 2 6 mm Bore Type Round Clearance Diameter 18 mm Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 18 mm Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 6 mm Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 6 mm Maximum Speed 4 000 RPM Maximum Torque 34 N-m Overall Length 30 mm