Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Steel Material Grade/Class Grade 5 Finish Zinc Yellow For Screw Size M4 Inside Diameter 4.3 mm Outside Diameter 9 mm Maximum Thickness 0.8 mm System of Measurement Metric Minimum Thickness 0.8 mm Maximum Temperature 302 Degrees F Minimum Temperature -58 Degrees F Pack Size Small Pack Package Quantity 100