Fender Washer Flat Washer Type Oversized Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size 5/16 in Inside Diameter 0.344 in Outside Diameter 5/8 in Maximum Thickness 0.047 in System of Measurement Inch Minimum Thickness 0.047 in Color Silver Inside Diameter Tolerance 0.339-0.359 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C