Castle Nut, Zinc-Plated, Material Steel, Material Grade/Class Grade 2, Thread Size 1/2 In.-13, Hex Width 3/4 in, Hex Height 7/16 in, Hex Type Standard Hex, Lock Type Slotted Castle, Dimensional Standards ASME B18.2.2, Material Quality Standards ASTM 563, System of Measurement Inch, Thread Direction Right Hand, For Pin Diameter 9/64 in, Includes Pin No, Maximum Slot Width 0.18 in, Pack Size Small Pack, Package Quantity 25.