1/2"-20, THK=7/16", A/F=3/4" Slotted Hex Nuts, Steel, Plain

Also known as castellated nuts.Designed to use a cotter pin that fits through the slots to prevent the nut from loosening.Diameter (Nominal): 1/2"Thread Pitch: 20Thickness (Nominal): 7/16"Across Flats (Basic): 3/4"Product Class: Internally Threaded...