USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.22.1 Type A Wide, USS Standard, Material Steel, Material Grade/Class Grade 2, Finish Plain, For Screw Size 2 1/2 in, Inside Diameter 2.625 in, Outside Diameter 5 in, Maximum Thickness 9/32 in, System of Measurement Inch, Minimum Thickness 13/64 in, Pack Size Small Pack, Resistance Properties Corrosion-Resistant, Rockwell Hardness 38HRC, Thickness Tolerance +/-0.035 in, Package Quantity 50