Flat Washer, Flat Washer Type Standard, Dimensional Standards ASME B 18.22. 1, Material Steel, Material Grade/Class Case Hardened, Finish Zinc-Plated, For Screw Size 1 1/2 in, Inside Diameter 1.625 in, Outside Diameter 3 in, Maximum Thickness 5/32 in, System of Measurement Inch, Minimum Thickness 5/32 in, Color Silver, Inside Diameter Tolerance + 0.045 / - 0.010, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Material Quality Standards SAE J403