Lock Washer, Lock Washer Type Internal Tooth Lock, Finish Plain, Material Stainless Steel, For Screw Size 5/16 in, Inside Diameter 0.314 in, Outside Diameter 0.607 in, Maximum Thickness 0.029 in, Color Silver, Dimensional Standards ASME B18.21.1, For Use With -, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness B85, System of Measurement Inch, Thickness Tolerance 0.034 in to 0.028 in, Package Quantity 25