Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 1/2 in Bore Thread Size Not Applicable Collar Outside Diameter 1 1/2 in Inside Height to Flat Not Applicable Clearance Diameter Not Applicable Collar Width 13/32 in Collar Material Aluminum Keyway Width Not Applicable Collar Material Grade 6061 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top 0.75 in Collar Construction 1-Piece Screw Material Stainless Steel