Home / News Center / Industry News / China's research and development of a new type of nut, surpassing Japan's "never loose" nut, used in the construction of the Qinghai-Tibet Railway

China's research and development of a new type of nut, surpassing Japan's "never loose" nut, used in the construction of the Qinghai-Tibet Railway

The so-called "Never Loose" nut was once popular all over the world, and some people say that China's high-speed rail is inseparable from Japan's nut. As everyone knows, China has already developed a self-locking nut to beat the opponent!

Let's first take a look at the strength of the nut that Japan claims to be "never loose". This kind of nut is made of Japan Hardlock Industry Co., Ltd. It’s not an exaggeration to say that almost every country in the world counted on this Only a few dozen employees "Never loosen" nuts produced by a small Japanese factory.

After the advent of the "never loose" nut in Japan, it was promoted all over the world. Railways in countries such as China, South Korea, the United Kingdom, and Poland often use this nut. In addition, the space shuttle launch pad in the United States, the Akashi Kaikyo Bridge, the longest suspension bridge in Japan, and the Tokyo Skytree, the world's tallest free-standing radio tower, all use this "never loose" nut.

What I want to say here is that, in fact, this kind of nut is not as powerful as the rumors, and it cannot truly "never loosen".

Why do you say this? This kind of nut mainly relies on the joint action of two nuts and uses eccentric pressure to fix the tightness of the nut. However, the nut manufactured by this principle will be affected by the eccentric force, so that the overall service life of the nut is not long, and it needs to be tightened and replaced regularly. Under normal circumstances, Japanese "never loosen" nuts require a tightening operation every few months.

So what is the level of nuts in our country today?

Many people may not know that China's nut industry has already reached the world's leading level. As early as 2002, China has developed a "Never Loose" nut that is unique to China—— Self-locking nut , And also used it on the extremely difficult Qinghai-Tibet Railway. Moreover, the one developed by our country is truly "never loose", because even if it is screwed out, the nut will not be loosened at all.

This self-locking nut consists of a nut and a washer, it has Anti-loose , shockproof Etc. It uses the spiral surface anastomosis structure between the nut and the washer to achieve self-tightening force. When the nut is loose, the washer will generate friction through friction with the nut, so as to achieve the effect of anti-loosening and anti-falling. Therefore, self-locking nuts can only be tightened but not loosened, and the nut can only be loosened by turning the washer. Moreover, the self-locking nut produced in our country also has a multi-section spiral support structure, which improves the stability of the nut, can evenly distribute the stress, greatly improves the bearing capacity of the nut and the screw, and reduces the nut during use. Damage. In addition, the self-locking nut also has a strong active self-tightening force, which is much stronger than the Japanese "never loosen" nut. The self-locking nut will produce greater reverse self-tightening force when rotating in the opposite direction, which is extremely safe, and it is not inferior even compared with welding.

Of course, the advantages of self-locking nuts in our country are more than these. As we mentioned earlier, Japan’s “never loose” nuts require a tightening operation every 6 months, but our country’s self-locking nuts don’t need it at all. , And it is precisely because of this that we dare to boldly apply it to the plateau railway.