Flat Washer, Dimensional Standards AMPG 2001 FL.01, Material Steel, Material Grade/Class Case Hardened, Finish Nickel-Plated, For Screw Size 3/4 in, Inside Diameter 0.781 in, Outside Diameter 50 in, Maximum Thickness 5/32 in, System of Measurement Inch, Minimum Thickness 5/32 in, Inside Diameter Tolerance +/-0.010 in, Made in North America Made in North America, Material Quality Standards ASTM A108, Outside Diameter Tolerance +/-0.010 in, Thickness Tolerance +0.005/-0.020 in