The Swedes invented a small washer that keeps the nut from loosening!

The role of fasteners is self-evident, especially in the major engineering and mechanical manufacturing, the requirements for fasteners are very demanding. Under the strong vibration, you can't loose it!

A few days ago we briefly introduced two kinds of relaxation bolts in Japan. Today we will take a deeper look at their background and principles.

First, the principle that the anti-loose washer is not loose

This anti-loose washer consists of two identical washers, each with different serrations on the top and bottom. One side is a cam-shaped large tooth whose slope angle α is larger than the bolt thread angle β and the other side is a denser small tooth. When the gasket is installed, the large tooth faces are opposite and installed in pairs. The small flank faces are in contact with the nut and the fastener, respectively.

After tightening the bolt connection fasteners, when the vibration occurs, the large tooth surface will be moved up and down, and the bolt will be locked by the principle that the angle α is larger than the angle β so that it cannot be loosened.

When the bolt or nut is tightened, the radial serrations bite the contact surface tightly, holding the NORD-LOCK washer in place, allowing only relative movement between the large flank surfaces. Any loosening tendency of the bolt or nut is prevented by this wedging effect of the large serration. The lifting distance between the two NORD-LOCK washers is greater than the distance the bolt or nut is lifted due to the sliding of the thread.

When the nut is removed with a wrench, the clamping force rises significantly, which is a good proof of the superior locking function of the NORD-LOCK washer.

The hard lock nut invented by Japanese Jolin Kyuhwan, known as the never loose nut, is simple in principle and structure, but it is not easy to manufacture. He can use "different eccentricity for different sizes and materials" as his exclusive . It has become the only manufacturer and enterprise in the world that can successfully produce such “never loose” nuts.

Not only China, but also the screws used in the high-speed railroads built in countries around the world need to be imported from Japan, which is not complicated. It cannot be said that it is not a very unbelievable situation.

Second, the wedge and the hammer combo nut

The concept of the "Hard Lock Nut" is very simple, that is, the wedge is inserted between the nut and the screw to prevent loosening. However, if the wedges are broken into the nut to be used at the construction site, it is neither efficient nor realistic. How can we make the nut have the function of a wedge? Ruolin had a hard time thinking about it.

The method he thought of was to use two nuts in a "concave" "convex" shape on a screw. The nut below the convex shape is slightly displaced (eccentrically processed) during machining, and acts as a wedge. The nut with a concave shape on the top is not subjected to the off-center machining (circular machining), thus forming the function of the hammer to beat the wedge. The two nuts are combined into one, and the loosening problem is solved.

They created Superbolt - Super Bolt Multi-Pushing Pretensioners (MJTs)

It can directly replace hex nuts, cap nuts, bolts, etc. They are screwed onto your existing bolts or studs and provide a better way to tighten your connections. It consists of three parts:

1. A hard gasket protects your equipment and provides a hard, flat surface for the push screw to "push".

2. Manually screw the nut body over the existing bolt or stud and press it onto the washer (the nut body is usually circular).

3. Using a common hand tool, screw the jackscrew into the nut body and lock the connector to the pure tension.

In the world's major industrial sectors, from space to deep sea, from small to large, super bolts are currently the preferred solution for bolting! It can be said that it is a huge innovation, no need for professional technology and heavy tools!

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