Hex Nut, Hex Type Standard Hex, Finish Black Oxide, Material Grade/Class Grade 5, Material Steel, Thread Size 1 3/8 In.-6, Hex Width 2 1/32 in, Hex Height 1 11/64 in, Dimensional Standards ASME B18.2.2, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Removable Yes, Rockwell Hardness HRC 32, Thread Type Coarse, Package Quantity 5