Split Lock Washer, Standard, 316 Stainless Steel, Finish NL-19 (r), Fits Bolt Sizes 5/16 In., 5/16 In., Inside Dia. 0.314 In., Outside Dia. 0.583 In., Thickness 0.078 In., Thickness Tolerance +/- 0.005 In., Color Silver, Rockwell Hardness C35, Metalworking, Fastening, For Use With Machine Screws and Nuts, Meets/Exceeds ANSI B 18.21. 1, Package Quantity 50. This item has been restricted from sale in the following state (s): []