Jam Nut, Hex Type Jam Hex, Finish Black Oxide, Material Steel, Material Grade/Class Grade A, Thread Size 1/4 In.-28, Hex Width 7/16 in, Hex Height 5/32 in, Dimensional Standards ASME B18.2.2, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Thread Type Fine, Package Quantity 100