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The nylon lock nut is a round nut, and in the four small slots that are open to the outside, a crescent wrench screw can be used on the stud, and the lock nut should be equipped with a shaft washer, which can be used to make small groove studs .It is relatively fixed with its peripheral groove to prevent it from loosening. The nuts on the bolts are embedded on the nylon extrusions to make the nylon deform. After installation, the nylon and the threads are completely pressed and contacted. The elastic force of extruding the nylon to the bolt is very large, which increases friction and makes the bolts less likely to loosen.