The Nylok® provide a powerful anti-loosening function. In the second part of this article, we will introduce the fastening principle of the Nylok® technology.

How screws can be fasten and loosen?

For you to understand how Nylok® works, firstly you need to know "why screws can be fastened?" and "why they become loosen?" This is because all anti-loosening function products, including Nylok®, they follow the principle of screw fastening.

Screws can remain fastened with the axial force and frictional force generated when they are fastened. When screw is fastened, the screw will be pulled from the place where it has been. From that moment, a force that causes the screw return to its original state, which is an axial force will be generated. When this axial force is generated, the frictional force is also generated on the faced surface (surface or threaded part) of the male and female threads, then the screws can be fastened.

So, on the other hand, why do screws come loose? It occurred when its axial force and frictional force drop. There is always a gap between male and female threads. Without the gap, it cannot be fit or insert. However, if there is vibration, shaking, or impact occurred after the screw is fastened, there will be invisible power that reduce the force. The reduction in the axial force causes the frictional force to decrease and the screw to loosen.

Principle of Nylok®'s fastening

Nylok® is balancing "axial force" and "frictional force" when fastening. All types of anti-loosening screws, such as spring washers, flat washers, and those with flanges are also use this principle. Nylok® is a technology which designed to increase and maintain the frictional force and to make it as easy as possible to install.

As shown in the figure below, Nylok® is not apply all around but it is basically applied on partial thread only.

▲ Standard male screw - Nylok® processing position

Standard male screw - Nylok® processing position

When a screw with Nylok® is fastened, it will be become very tight so that it cannot be fasten by hand from the point of engagement. It can be tightened with a tool such as a screwdriver, wrench, or spanner, but for Nylok® which is made of nylon, it is softer than metal and spread the shape along the threads. It can be tightened by hand, but once the Nylok® is spread over the thread, there is a force of returning occurred. For example, when a rubber ball is squeezed with a hand, it will shrink and sudden return its shape we undid, also a great force will be returned to the hand. That force is generated in the gap between the male and female threads.

When the screw is pushed into the opposite direction where Nylok® is not applied, also the frictional force will be generated on the metal-to-metal contact surface, creating a locking effect. The Nylok® processing is also reduces the original gap between the male and female threads, which makes it difficult to move in the return direction even if there are vibration or shaking occurring.

Nylok® processed products can be sold in Thailand as in few as just as one piece!

Nylok® processed products are coated at the factory before being supplied to customers. Generally, unit price will be higher when the quantity is small because there are a fixed cost for the process. However, at Hanshin Neji, we have created a standard specification that can be used for general purposes by many of our customers, and Nylok® processed products are stocked in advance at our head office in Japan and ready to ship from Japan to Thailand.

We can supply even from one piece, so please feel free to contact us for more information.
If you are considering using our products in security concerned areas such as for railroad vehicles or nuclear power plants, please be sure to let us know.

If you are looking for anti-loosening screws (Nylok®) or have any other concerns about loosening screws, please feel free to contact us using the form as below.