Elliptical Offset Nuts
Elliptical offset nuts, also known as oval locknuts or non-slotted hex locknuts, is a nut that has been deformed at one end so that the threads are no longer perfectly circular. The deformed end is usually shaped into an ellipse or obround triangle. The nut is easily started on the male fastener as the bottom portion is not deformed. As the male fastener reaches the deformed section it deforms the threads of the nut elastically back into a circle. This action increases the friction between the nut and the fastener greatly and creates the locking action. Due to the elastic nature of the deformation the nuts can be reused indefinitely.
Read more about this topic: Distorted Thread Locknut
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