Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 1 1/2 in Bore Thread Size Not Applicable Collar Outside Diameter 2 3/8 in Inside Height to Flat Not Applicable Clearance Diameter 2.63 in Collar Width 9/16 in Collar Material Carbon Steel Keyway Width Not Applicable Collar Material Grade 1211 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 2-Piece Screw Material Carbon Steel