Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 7/16 in Bore Thread Size Not Applicable Collar Outside Diameter 15/16 in Inside Height to Flat Not Applicable Clearance Diameter 1.08 in Collar Width 11/32 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