1. In Asia, Japan does have certain advantages in science and technology, and it has always been envied and even sought after by many people. In fact, Japan is outstanding in some aspects, but it does not mean that it is outstanding in all aspects of science and technology.
2. This Japanese non-loosening screw is a fastener called Hadelok, which was developed by a small company with only 40 people. Moreover, this fastener is said to never loosen, and other countries, including China, have not mastered the core technology of this fastener. Even if the data and objects of this fastener are given, other countries can't develop it. It can be said that Hadelok fastener plays wonderfully.
3. In fact, this Hadelok fastener is not as perfect as everyone thinks. This fastener also has disadvantages. Mainly rely on two nuts to work together. The second nut locks the first nut through eccentric pressure, and finally achieves the purpose of preventing it from loosening. There is a problem, because of the eccentricity of the second nut, the engagement between the nut and the bolt will inevitably be biased to one side. This eccentric stress will affect the fatigue strength of fasteners for a long time, leading to the decrease of the overall life of fasteners. Therefore, this kind of screw cannot be called a fastener that never loosens. It is only suitable for objects with low fatigue strength requirements, such as connecting rods in engines and key parts of aircraft, and it is not suitable for using this fastener.
4. It's not that China can't develop this kind of fastener, but it doesn't want to use it. Total * * * already has its own better fasteners. When the Qinghai-Tibet Railway was built in 2002, it was required that the fasteners on the elastic fasteners for rail pressing should be free of maintenance all the year round. After repeated research and development by professionals, the fasteners that meet the requirements have been developed. For more than ten years, there has been no fastener loosening accident. Therefore, China has its own core technology in fasteners, so why study Japanese Hadelok?