Flat Washer Flat Washer Type Standard Dimensional Standards TCMAI standards Material Steel Material Grade/Class Not Graded Finish Black Oxide For Screw Size 1 1/8 in Inside Diameter 1.156 in Outside Diameter 2 1/4 in Maximum Thickness 0.235 in System of Measurement Inch Minimum Thickness 0.203 in Color Black Maximum Temperature 400 Degrees F Thickness Tolerance +/-1/64 in Package Quantity 10