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In countries where the theft of alloy wheels is a serious problem, locking nuts (or bolts, as applicable) are available — or already fitted by the vehicle manufacturer — which require a special adaptor ("key") between the nut and the wrench to fit and remove. The key is normally unique to each set of nuts. Only one locking nut per wheel is ...
A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut, [1] stiff nut [1] or elastic stop nut, [2] is a nut that resists loosening under vibrations and torque. Prevailing torque nuts have some portion of the nut that deforms elastically to provide a locking action. [ 2 ]
The nuts themselves may have a mechanism that retains them inside the wheel once it is removed from the hub, to prevent loss and further streamline wheel changes. FIA rules also mandate an additional locking mechanism be included in F1 centerlock hubs, which manufacturers have implemented in different ways.
Standard nut employed as a jam nut against another standard nut. A jam nut is a low profile type of nut, typically half as tall as a standard nut. It is commonly used as a type of locknut, where it is "jammed" up against a standard nut to lock the two in place. It is also used in situations where a standard nut would not fit.
In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers, jam nuts, eccentric double nuts, [1] specialist adhesive thread-locking fluid such as Loctite, safety pins or lockwire in conjunction with castellated nuts, nylon inserts , or slightly oval-shaped threads.
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