Flat Washer Flat Washer Type Oversized Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Class 10.9 Finish Zinc Yellow For Screw Size 5/16 in Inside Diameter 0.344 in Outside Diameter 11/16 in Maximum Thickness 0.094 in System of Measurement Inch Minimum Thickness 0.094 in Color Yellow Inside Diameter Tolerance 0.339-0.359 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards ASTM A-325 Maximum Temperature 350 Degrees C