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 Plain, For Screw Size 1 3/8 in, Inside Diameter 1.5 in, Outside Diameter 3 1/4 in, Maximum Thickness 0.213 in, System of Measurement Inch, Minimum Thickness 0.153 in, Pack Size Small Pack, Resistance Properties Corrosion-Resistant, Rockwell Hardness 38HRC, Thickness Tolerance +/- 0.030 in, Package Quantity 25. This item has been restricted from sale in the following state (s): []