Self-locking nuts or lock nuts employ a locking device in their design to keep them from coming loose. However because there are several different types of lock nuts, you must be certain that the proper locknut is used in a given application. Failure to do so could result in failure of the locking provision. The two general types of self-locking nuts used in aviation are the fiber or nylon type and the all metal type. Figure below shows examples of self-locking nuts.
(Figure 1)
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