USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Grade 2, Finish Zinc Plated, For Screw Size 1/4 in, Inside Diameter 0.313 in, Outside Diameter 3/4 in, Maximum Thickness 0.063 in, System of Measurement Inch, Minimum Thickness 0.063 in, Color Silver, Inside Diameter Tolerance 0.308-0.328, Made in North America No, Manufacturer Location Globally Sourced, Material Quality Standards Not Rated, Maximum Temperature 350 Degrees C