Flat Washer, Flat Washer Type Standard, Dimensional Standards DIN 125-1A, Material Steel, Material Grade/Class Grade 2, Finish Zinc Plated, For Screw Size M30, Inside Diameter 31 mm, Outside Diameter 56 mm, Maximum Thickness 4 mm, System of Measurement Metric, Minimum Thickness 4 mm, Color Silver, Inside Diameter Tolerance 1.22-1.236, Made in North America No, Manufacturer Location Globally Sourced, Material Quality Standards Not Rated, Maximum Temperature 350 Degrees C