Flat Washer,M20 F/W 22 X 76 X 6.0-6.6 1, Dimensional Standards AMPG 2001 FL.01, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size M20, Inside Diameter 22 mm, Outside Diameter 76 mm, Maximum Thickness 6.6 mm, System of Measurement Metric, Minimum Thickness 6 mm, Inside Diameter Tolerance +/-0.010 in, Made in North America Made in North America, Material Quality Standards ASTM A582, Outside Diameter Tolerance +/-0.010 in