Shaft Collar Industry Standard Size N14 Bore Thread Size 2.751 in - 18 TPI Nut Outside Diameter 3 3/4 in Face Diameter 3 5/16 in Nut Width 5/8 in Bearing Face Maximum TIR 0.001 in Nut Material Carbon Steel Nut Material Grade 1215 System of Measurement Inch Resistance Properties Corrosion Resistant Screw Location from Center 1.6 in Screw Material Alloy Steel Maximum Operating Temperature 350 Degrees F Minimum Operating Temperature -40 Degrees F