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 1 3/8 in, Inside Diameter 1.5 in, Outside Diameter 3 1/4 in, Maximum Thickness 7/32 in, System of Measurement Inch, Minimum Thickness 5/32 in, Pack Size Small Pack, Resistance Properties Corrosion-Resistant, Rockwell Hardness 38HRC, Thickness Tolerance +/-0.030 in, Package Quantity 25