Shaft Collar, Industry Standard Size N07, Bore Thread Size 1.376 In. - 18 TPI, Nut Outside Diameter 2 1/4 in, Face Diameter 1 13/16 in, Nut Width 1/2 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 0.88 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. -