Flat Washer, Flat Washer Type Standard, Dimensional Standards DIN 125-1A, Material Steel, Material Grade/Class Grade 2, Finish Zinc Plated, For Screw Size M20, Inside Diameter 21 mm, Outside Diameter 37 mm, Maximum Thickness 3 mm, System of Measurement Metric, Minimum Thickness 3 mm, Color Silver, Inside Diameter Tolerance 0.827-0.84, Made in North America No, Manufacturer Location Globally Sourced, Material Quality Standards Not Rated, Maximum Temperature 350 Degrees C