Flat Washer Flat Washer Type Standard Dimensional Standards UL Standard Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size 3/8 in Inside Diameter 0.375 in Outside Diameter 7/8 in Maximum Thickness 0.05 in System of Measurement Inch Minimum Thickness 0.05 in Color Silver Material Quality Standards ASTM Pack Size Small Pack Resistance Properties Corrosion Resistant