Shaft Collar System of Measurement Inch Bore Type D Bore Diameter 3/4 in Bore Thread Size Not Applicable Collar Outside Diameter 1 1/2 in Inside Height to Flat 0.7 in Clearance Diameter 1.81 in Collar Width 1/2 in Collar Material Carbon Steel Keyway Width Not Applicable Collar Material Grade 1215 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 1-Piece Screw Material Alloy Steel Screw Material Finish Black Oxide