USS Washer, Flat Washer Type SAE, Dimensional Standards ANSI B18.21.1, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size 1/2 in, Inside Diameter 0.562 in, Outside Diameter 1 3/8 in, Maximum Thickness 1/8 in, System of Measurement Inch, Minimum Thickness 5/64 in, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM A582, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack