Lock Nut, Finish Zinc-Plated, Material Steel, Material Grade/Class Grade 2, Thread Size 1/4 In. -20, Hex Width 7/16 in, Hex Height 13/64 in, Lock Type Nylon Insert, Dimensional Standards IFI-100/107, System of Measurement Inch, Hex Type Standard Hex, Thread Direction Right Hand, Insert Material Nylon, Maximum Temperature 250 Degrees F, Pack Size Small Pack, Rockwell Hardness C28 Max., Package Quantity 100. This item has been restricted from sale in the following state (s): []