Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size M42 Inside Diameter 43 mm Outside Diameter 78 mm Maximum Thickness 7 mm System of Measurement Metric Minimum Thickness 7 mm Color Clear Inside Diameter Tolerance 1.693-1.717 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C