Shaft Collar System of Measurement Inch Bore Type Threaded Bore Diameter 1 1/4 in Bore Thread Size 1 1/4 In.-7 Collar Outside Diameter 2 1/16 in Inside Height to Flat Not Applicable Clearance Diameter 2.3 in Collar Width 1/2 in Collar Material Carbon Steel Keyway Width Not Applicable Collar Material Grade 1215 Keyway Depth Not Applicable Thread Direction Right Hand Thread Center to Lever Top Not Applicable Collar Construction 2-Piece Screw Material Alloy Steel