Flat Washer Flat Washer Type Standard Dimensional Standards DIN 9021 Material Steel Material Grade/Class Grade 2 Finish Zinc Yellow For Screw Size M4 Inside Diameter 4.3 mm Outside Diameter 12 mm Maximum Thickness 1 mm System of Measurement Metric Minimum Thickness 1 mm Color Yellow Inside Diameter Tolerance 0.169-0.176 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C