Flat Washers, Flat Washer Type Standard, Dimensional Standards DIN 9021, Material Steel, Finish Zinc-Plated, For Screw Size M12, Inside Diameter 13 mm, Outside Diameter 37 mm, Maximum Thickness 3 mm, System of Measurement Metric, Minimum Thickness 3 mm, Color Silver, Inside Diameter Tolerance 0.512-0.522, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Material Quality Standards Not Rated, Maximum Temperature 350 Degrees C