Plain Washer Flat Washer Type Standard Dimensional Standards DIN 7349 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size M4 Inside Diameter 4.3 mm Outside Diameter 12 mm Maximum Thickness 1.6 mm System of Measurement Metric Minimum Thickness 1.6 mm Maximum Temperature 302 Degrees F Minimum Temperature -58 Degrees F Pack Size Small Pack Package Quantity 100