Flat Washer Flat Washer Type Standard Dimensional Standards TCMAI standards Material Steel Material Grade/Class Not Graded Finish Black Oxide For Screw Size #1 Inside Diameter 1.031 in Outside Diameter 2 in Maximum Thickness 0.204 in System of Measurement Inch Minimum Thickness 0.172 in Color Black Maximum Temperature 400 Degrees F Thickness Tolerance +/-1/64 in Package Quantity 10