Shaft Collar System of Measurement Metric Bore Type Threaded Bore Diameter 16 mm Bore Thread Size M16x2 Collar Outside Diameter 34 mm Inside Height to Flat Not Applicable Clearance Diameter 39.3 mm Collar Width 13 mm Collar Material Stainless Steel Keyway Width Not Applicable Collar Material Grade 303 Keyway Depth Not Applicable Thread Direction Right Hand Thread Center to Lever Top Not Applicable Collar Construction 1-Piece Screw Material Stainless Steel