Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.21.1 Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size 7/8 in Inside Diameter 0.938 in Outside Diameter 2 1/4 in Maximum Thickness 0.165 in System of Measurement Inch Minimum Thickness 0.165 in Pack Size Small Pack Rockwell Hardness Not Rated Package Quantity 5