Shaft Collar, Industry Standard Size N03, Bore Thread Size 0.664 In. - 32 TPI, Nut Outside Diameter 1 1/2 in, Face Diameter 15/16 in, Nut Width 7/16 in, Bearing Face Maximum TIR 0.0005 in, Nut Material Carbon Steel, Nut Material Grade 1215, System of Measurement Inch, Resistance Properties , Screw Location from Center 0.5 in, Screw Material Alloy Steel, Maximum Operating Temperature 350 Degrees F, Minimum Operating Temperature -40 Degrees F This product contains a chemical that is regulated under California Proposition 65. Warning: This product contains a chemical known to the State of California to cause cancer. Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. -