Lock Nut, Finish Zinc-Plated, Material Steel, Material Grade/Class Not Graded, Thread Size 1/4 In. -20, Hex Width 7/16 in, Hex Height 13/64 in, Lock Type With Conical Washer, System of Measurement Inch, Hex Type Standard Hex, Thread Direction Right Hand, Pack Size Small Pack, Rockwell Hardness C38-C44, Package Quantity 100. This item has been restricted from sale in the following state (s): []