The lock nut is a round nut with four small grooves on its outer periphery. It can be screwed on the stud body with a crescent wrench. The peripheral small groove is relatively fixed to prevent it from loosening. At present, lock nuts have a variety of new designs, each of which is different, but their purpose is to prevent loosening. There are threaded holes drilled from the outer surface of the nut to the inner thread surface (usually two, on the outer surface). 90 distribution), used to screw in small-diameter countersunk screws, the purpose is to apply a centripetal force to the thread to prevent the lock nut from loosening.
At present, the lock nuts with better quality on the market are inlaid on the inner surface of the nut with a copper piece consistent with the thread of the lock nut, which is used to prevent the radial jacking screw from directly contacting the locked thread and causing damage. By. This kind of lock nut has gradually begun to be applied in the occasion of the shaft end locking of rotating parts, such as the anti-loosening of the bearing at the mounting end of the ball screw.
Nuts that rely on nylon washers for locking are called nylon lock nuts, usually referred to as caps in the industry. It is mainly used in conjunction with threaded screws or bolts and other connecting parts. After locking, the nylon ring will deform, filling the gaps between the two ends of the connecting parts, thereby achieving a locking effect, and the shape is like the figure upstairs.
Generally, nuts and bolts are processed by press-fitting. After tightening with a nut, it actually depends on the friction force generated by the elasticity of the bolt and the nut to be tightened. This friction force will be affected by vibration and temperature, such as being tightened. When the parts are cold-shrinked, the friction between the nut and the bolt will be greatly reduced, causing looseness.
