Flat Washer Flat Washer Type Standard Dimensional Standards TCMAI standards Material Steel Material Grade/Class Not Graded Finish Black Oxide For Screw Size #8 Inside Diameter 0.188 in Outside Diameter 7/16 in Maximum Thickness 0.094 in System of Measurement Inch Minimum Thickness 0.062 in Color Black Maximum Temperature 400 Degrees F Thickness Tolerance +/-1/64 in Package Quantity 25