castellated slot

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Castellated nut — A castellated nut (also called a castle nut or a slotted nut) is a nut with slots (notches) cut into one end. The name comes from the nut’s resemblance to the crenellated parapet of a medieval castle. The bolt or axle has one or two holes drilled … Wikipedia
Nut (hardware) — A nut threaded onto a bolt A nut is a type of hardware fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads… … Wikipedia
Edzell Castle — Near Edzell, Angus, Scotland grid reference NO584691 … Wikipedia
castellation — a unit of angle measure equal to 1/6 turn or 60°, used in mechanical engineering. A castellated nut is a locknut having a raised rim with a number of equally spaced slots, usually 6. A cotter pin fits into one of the slots and into a hole… … Dictionary of units of measurement

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