Lock Nut, Finish Zinc Yellow, Material Steel, Material Grade/Class Grade C, Thread Size 1/2 In. -13, Hex Width 3/4 in, Hex Height 17/64 in, Lock Type Top Lock Distorted Thread, Dimensional Standards IFI-100/107, System of Measurement Inch, Hex Type Standard Hex, Thread Direction Right Hand, Pack Size Small Pack, Rockwell Hardness C24-32, Package Quantity 50. This item has been restricted from sale in the following state (s): []