Flat Washer Type B Flat Washer Type Standard Dimensional Standards ASME B18.22.1 Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size 1 1/4 in Inside Diameter 1.312 in Outside Diameter 3 in Maximum Thickness 0.174 in System of Measurement Inch Minimum Thickness 0.146 in Color Silver Inside Diameter Tolerance +/-0.010 in Material Quality Standards ASTM A582 Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack