Flat Washer Flat Washer Type Oversized Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size 1/4 in Inside Diameter 0.281 in Outside Diameter 5/8 in Maximum Thickness 0.05 in System of Measurement Inch Minimum Thickness 0.05 in Color Silver Inside Diameter Tolerance +/-0.010 in Material Quality Standards ASTM A276 Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack Resistance Properties Corrosion Resistant Saltwater Resistant Solvent Resistant