Beveled Washer Flat Washer Type Beveled Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size 5/16 in Inside Diameter 0.344 in Outside Diameter 3/4 in Maximum Thickness 0.125 in System of Measurement Inch Minimum Thickness 0.125 in Inside Diameter Tolerance +/-0.010 in Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack Rockwell Hardness B55 Thickness Tolerance +0.005/-0.004 in Package Quantity 25