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What needs to be paid attention to during the operation of the lock nut

Update:06-09-2021
Summary:

The anti-loosening effect of the lock nut mainly depend […]

The anti-loosening effect of the lock nut mainly depends on the interaction force between the nut and the bolt engaging thread. There are many ways to improve the interaction force between meshing threads, such as structural improvement of nut threads, nylon roughening of nylon nuts, and surface treatment of threads.
Points to note during the operation of the lock nut:
1. Use two same nuts to screw on the same bolt, and add a tightening torque between the two nuts to make the bolt connection reliable.  
2. A threaded hole is drilled from the outer surface of the nut to the inner thread surface for screwing in small-diameter countersunk screws. The purpose is to apply a centripetal force to the thread to prevent the lock nut from loosening.

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