Split Lock Washer, Standard, 316 Stainless Steel, Finish NL-19 (r), Fits Bolt Sizes 1/2 In., 1/2 In., Inside Dia. 0.502 In., Outside Dia. 0.869 In., Thickness 0.125 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 25. This item has been restricted from sale in the following state (s): []