Fender Washer Flat Washer Type Oversized Dimensional Standards ASME B18.21.1 Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size 1/2 in Inside Diameter 0.531 in Outside Diameter 3 in Maximum Thickness 0.065 in System of Measurement Inch Minimum Thickness 0.065 in Color Silver Inside Diameter Tolerance .535 +.010-.010 IN Made in North America No Manufacturer Location Made in USA Material Quality Standards ASTM A1008 Maximum Temperature 302 Degrees F