Flat Washer, Flat Washer Type Standard, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Class 8.8, Finish Black Oxide, For Screw Size 1 in, Inside Diameter 1.031 in, Outside Diameter 2 in, Maximum Thickness 3/16 in, System of Measurement Inch, Minimum Thickness 3/16 in, Color Clear, Inside Diameter Tolerance 1.024-1.093in, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Material Quality Standards ASTM A-325