Flat Washer Flat Washer Type SAE Dimensional Standards ASME B18.21.1 SAE Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size 1/2 in Inside Diameter 0.531 in Outside Diameter 1 1/16 in Maximum Thickness 0.095 in System of Measurement Inch Minimum Thickness 0.095 in Color Clear Inside Diameter Tolerance 0.526-0.546 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C