Flat Washer, Dimensional Standards AMPG 2001 FL.01, Material Stainless Steel, Material Grade/Class Through Hardened, Finish Plain, 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 11/64 in, Inside Diameter Tolerance +/-0.010 in, Made in North America Made in North America, Material Quality Standards ASTM A564 Type 630, Outside Diameter Tolerance +/-0.010 in