Flat Washer, Flat Washer Type Standard, Dimensional Standards ASME B18.21.1, Material Steel, Material Grade/Class Case Hardened, Finish Zinc-Plated, For Screw Size #10, Inside Diameter 0.188 in, Outside Diameter 9/16 in, Maximum Thickness 3/64 in, System of Measurement Inch, Minimum Thickness 3/64 in, Color Silver, Inside Diameter Tolerance 0.183-0.196, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Material Quality Standards Not Rated