Lug nut
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A lug nut is a nut with one rounded or conical (tapered) end, typically used to attach wheels to axles and prevent rim theft. Some designs use a bolt screwing into a tapped hole (bolted joint) rather than a nut and protruding stud. The tapered end is designed to centre the wheel accurately on the axle, and to reduce the tendency for the screw to loosen.