Flat Washer, Flat Washer Type Standard, Dimensional Standards DIN 125-1A, Material Steel, Material Grade/Class Grade 2, Finish Black Oxide, For Screw Size M39, Inside Diameter 40 mm, Outside Diameter 72 mm, Maximum Thickness 6 mm, System of Measurement Metric, Minimum Thickness 6 mm, Color Clear, Inside Diameter Tolerance 1.575-1.599, Made in North America No, Manufacturer Location Globally Sourced, Material Quality Standards Not Rated, Maximum Temperature 350 Degrees C