Flat Washer, Dimensional Standards RoHS Compliant, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size 5/16 in, Inside Diameter 0.344 in, Outside Diameter 11/16 in, Maximum Thickness 7/64 in, System of Measurement Inch, Minimum Thickness 3/32 in, Inside Diameter Tolerance +/-0.010 in, Made in North America Made in North America, Material Quality Standards ASTM A582, Outside Diameter Tolerance +/-0.010 in