Lock Nut, Finish Zinc Plated, Material Steel, Material Grade/Class Grade 2, Thread Size 5/16 In.-18, Hex Width 9/16 in, Hex Height 7/16 in, Lock Type Nylon Insert, System of Measurement Inch, Hex Type Standard Hex, Thread Direction Right Hand, Insert Material Nylon, Pack Size Small Pack, Rockwell Hardness B68-C32, Package Quantity 100