USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.21.1, Material Steel, Material Grade/Class Case Hardened, Finish Black Oxide, For Screw Size 1 3/4 in, Inside Diameter 1.875 in, Outside Diameter 4 in, Maximum Thickness 3/16 in, System of Measurement Inch, Minimum Thickness 3/16 in, Color Clear, Inside Diameter Tolerance 1.865 to 1.92, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Material Quality Standards Not Rated