Split Lock Washer, Standard, Carbon Steel, Finish Zinc, Fits Bolt Sizes 5/16 In., Inside Dia. 0.322 In., Outside Dia. 0.583 In., Thickness 0.078 In., Rockwell Hardness C38 to C46, 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): []