Flat Washer, Flat Washer Type Standard, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Class 10.9, Finish Zinc Yellow, For Screw Size 3/8 in, Inside Diameter 0.406 in, Outside Diameter 13/16 in, Maximum Thickness 1/8 in, System of Measurement Inch, Minimum Thickness 1/8 in, Color Yellow, Inside Diameter Tolerance 0.401-0.421, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Material Quality Standards ASTM A-325