Shaft Collar System of Measurement Metric Bore Type Round Bore Diameter 40 mm Bore Thread Size Not Applicable Collar Outside Diameter 60 mm Inside Height to Flat Not Applicable Clearance Diameter 63.8 mm Collar Width 12 mm Collar Material Stainless Steel Keyway Width Not Applicable Collar Material Grade 303 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 1-Piece Screw Material Stainless Steel