The locking nut of the standard type is a round nut with four small slots around it. A crescent wrench can be used to tighten the screw. The locking nut should be equipped with a shaft washer, which can make the small slot on the screw body relatively fixed with the small slot around it to prevent its loosening. At present, lock nut has a variety of new design, different, but its purpose is to prevent looseness.
[VIP第7年] 指数:7
