Fender Washer Flat Washer Type Oversized Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size 3/8 in Inside Diameter 0.406 in Outside Diameter 1 1/4 in Maximum Thickness 0.06 in System of Measurement Inch Minimum Thickness 0.04 in Inside Diameter Tolerance +/-0.010 in Material Quality Standards ASTM A582 Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack Resistance Properties Chemical Resistant Corrosion Resistant Rockwell Hardness B83