Lock Nut, Finish Zinc Yellow, Material Steel, Material Grade/Class Grade 8, Thread Size 9/16 In.-18, Hex Width 7/8 in, Hex Height 31/64 in, Lock Type Nylon Insert, Dimensional Standards ASME B18.16.6, System of Measurement Inch, Hex Type Standard Hex, Thread Direction Right Hand, Pack Size Small Pack, Rockwell Hardness C26--34, Package Quantity 25