Shaft Collar System of Measurement Metric Bore Type Round Bore Diameter 50 mm Bore Thread Size Not Applicable Collar Outside Diameter 100 mm Inside Height to Flat Not Applicable Clearance Diameter Not Applicable Collar Width 19 mm Collar Material Aluminum Keyway Width Not Applicable Collar Material Grade 6061 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top 50 mm Collar Construction 1-Piece Screw Material Stainless Steel