Flat Washer Flat Washer Type Oversized Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size 1 1/2 in Inside Diameter 1.563 in Outside Diameter 3 1/4 in Maximum Thickness 0.125 in System of Measurement Inch Minimum Thickness 0.125 in Color Silver Inside Diameter Tolerance +/-0.010 in Material Quality Standards ASTM A276 Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack