USS Washer, Flat Washer Type USS, Dimensional Standards ASME B 18.22. 1 Type A Wide, USS Standard, Material Steel, Material Grade/Class Grade 2, Finish Zinc-Plated, For Screw Size 5/16 in, Inside Diameter 0.375 in, Outside Diameter 7/8 in, Maximum Thickness 0.104 in, System of Measurement Inch, Minimum Thickness 0.064 in, Pack Size Bulk Pack, Resistance Properties Corrosion-Resistant, Rockwell Hardness 38HRC, Thickness Tolerance +/- 0.020 in, Package Quantity 4350. This item has been restricted from sale in the following state (s): []