It is advertised that it is the “Hard Lock nut” invented by a Japanese company. It is also controversial that it is the “eccentric self-locking nut” invented in China. Well, it doesn’t matter what its name is, or whether it is made in China or in Japan. Only by seeing the existence of this kind of nut in major bridges and buildings around the world, let’s talk about its principle and structure.
The principle and structure of the nut are relatively simple. First of all, this kind of nut is used in pairs. It is divided into a concave nut and a convex nut. Pay attention to the order when installing. The convex nut is installed at the bottom and the concave nut is installed at the top. The eccentric processing used in the manufacture of the convex nut, the concave nut is a normal center round processing, when two convex and concave nuts are screwed together, it is like inserting a wedge into the nut, thereby achieving the effect of preventing loosening.
In simple terms, its principle is a two-in-one nut with a wedge and a hammer , as shown in the figure above;
It fundamentally solves the problems of insufficient anti-loose strength of the existing nut anti-loose, and its structure is reasonable. It has the advantages of convenient disassembly and assembly, repeated use, reliable anti-loose, and is not restricted by any use conditions. Lock performance and service life.
This nut is used by the world’s largest aircraft manufacturer Boeing in the United States, Rolls Royce in Europe, railways in Australia, Britain, Poland, China, and South Korea, and the Shinkansen (Taiwan High Speed Rail) in Taiwan. When the high-speed rail is in operation, the high-speed train and the rail are in constant contact, and the resulting vibration is very large, and ordinary screws will be loosened and flew in this kind of vibration. If you don’t want to be shaken off, then you need this kind of nut that never loosens.
It is also said that domestic manufacturers do not have this kind of technology, even if they understand the principle of this kind of nut, they cannot produce it. Many companies in Japan have this kind of unique technology that you will never learn. This is the key to technology. Although you know the principle and structure of this kind of nut with tenon, you just can’t produce a nut that will never loosen. This is the skill of others.
In fact, this is all bullshit. A certain domestic manufacturer (which is definitely not advertising here) has already achieved mass production and also has invention patents. It has been mass-produced and serialized. There is even dispute that this nut was invented in China. Of course These are not topics we discussed, we are just explaining this product to increase our knowledge and understanding of it.