Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size M8 Inside Diameter 8.4 mm Outside Diameter 16 mm Maximum Thickness 1.6 mm System of Measurement Metric Minimum Thickness 1.6 mm Color Clear Inside Diameter Tolerance 0.331-0.339 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C