Rigid Shaft Coupling Bore Diameter 1 4 mm Bore Diameter 2 4 mm Bore Type Round Clearance Diameter 15 mm Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 15 mm Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 4 mm Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 4 mm Maximum Speed 4 000 RPM Maximum Torque 2.51 N-m Overall Length 22 mm