Split Lock Washer, Finish Zinc Plated, Material Steel, For Screw Size 5/16 in, Inside Diameter 0.314 in, Outside Diameter 0.567 in, Maximum Thickness 0.056 in, Minimum Thickness 0.056 in, Color Silver, Dimensional Standards ASME B18.21.1, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness C38, System of Measurement Inch, Thickness Tolerance +0.010 in, Package Quantity 100