Flat Washer Flat Washer Type Oversized Dimensional Standards ASME B18.21.1 Material Steel Material Grade/Class Grade 2 Finish Hot Dipped Galvanized For Screw Size 7/16 in Inside Diameter 0.5 in Outside Diameter 1 1/4 in Maximum Thickness 0.083 in System of Measurement Inch Minimum Thickness 0.083 in Color Silver Inside Diameter Tolerance 0.495-0.515 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated