Plain Washer Flat Washer Type Standard Dimensional Standards DIN 7349 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size M18 Inside Diameter 19 mm Outside Diameter 44 mm Maximum Thickness 8 mm System of Measurement Metric Minimum Thickness 8 mm Maximum Temperature 302 Degrees F Minimum Temperature -58 Degrees F Pack Size Small Pack Package Quantity 100