Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 11/16 in Bore Thread Size Not Applicable Collar Outside Diameter 1 3/8 in Inside Height to Flat Not Applicable Clearance Diameter 1.56 in Collar Width 7/16 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