Variable tooth lock nut is a thread geometry redesigned by American engineers after studying the shape and stress of fastener thread. In the late 1970s, the locking thread technology as internal thread was invented. American military standard # MIL-N-85353, the bottom of the female thread has a 30-degree wedge bevel. When the bolt and nut are tightened, the tip of the bolt tightly abuts against the wedge-shaped inclined plane of the variable tooth locking thread, resulting in a large size. Due to the change of tooth profile angle, the normal force generated by the contact between threads makes an angle of 60 with the bolt shaft, instead of 30 like ordinary threads. Obviously, the normal pressure of the variable tooth locking thread is much greater than the fastening pressure, so the locking friction will inevitably increase greatly.
The variable tooth lock nut should be used on heavy equipment with large vibration environment, such as construction machinery, mines, crushers, vibrating screens, port machinery, wind energy, automobile axles, etc. And the locking effect is very good. Large companies such as Xugong, Zhonglian and Yun Tong are all using this variable tooth lock nut. At present, there are only two or three domestic enterprises that can produce 30-degree variable-tooth nuts. Prices are higher than ordinary ones?
What are the advantages of 30-degree variable tooth lock nut?