Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.22.1 Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size 9/16 in Inside Diameter 0.625 in Outside Diameter 1 1/2 in Maximum Thickness 0.094 in System of Measurement Inch Minimum Thickness 0.094 in Pack Size Small Pack Package Quantity 25