Lock Nut, Finish Zinc Plated, Material Steel, Material Grade/Class Grade 8, Thread Size 5/8 In.-18, Hex Width 15/16 in, Hex Height 3/4 in, Lock Type Nylon Insert, Dimensional Standards ASME B18.16.6, System of Measurement Inch, Hex Type Jam Hex, Thread Direction Right Hand, Pack Size Small Pack, Package Quantity 10