Flat Washer Flat Washer Type Standard Dimensional Standards TCMAI standards Material Steel Material Grade/Class Not Graded Finish Black Oxide For Screw Size #10 Inside Diameter 0.203 in Outside Diameter 1/2 in Maximum Thickness 0.11 in System of Measurement Inch Minimum Thickness 0.078 in Color Black Maximum Temperature 400 Degrees F Thickness Tolerance +/-1/64 in Package Quantity 25