Lock Washer, External Tooth, Type A, Carbon Steel, Finish Zinc, Fits Bolt Sizes 5/16 In., Inside Dia. 0.332 In., Outside Dia. 0.610 In., Thickness 0.034 In., Rockwell Hardness C40 to C50, Helps Prevent Loosening, For Use With Bolts and Nuts, Meets/Exceeds ASME B 18.21. 1, Refills -, Package Quantity 100. This item has been restricted from sale in the following state (s): []