Beveled Washer Flat Washer Type Beveled Material Steel Material Grade/Class Grade 5 Finish Black Oxide For Screw Size 1 1/4 in Inside Diameter 1.281 in Outside Diameter 2 1/4 in Maximum Thickness 0.312 in System of Measurement Inch Minimum Thickness 0.312 in Inside Diameter Tolerance +/-0.010 in Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack Rockwell Hardness C4 Thickness Tolerance +/-0.010 in