Nylok® is a technology which nylon patch is applied to screw threads to provide a powerful anti-loosening function. Among the various types of anti-looseness screws, it has many unique features, such as the fact that it can be processed for both male and female screws, and that it can be used repeatedly. This is a product that Hanshin Neji are proud to offer to customer. In this article, we will introduce the mechanism of the Nylok® technology and its awesomeness in two issues.

Nylok® can be apply in a wide range of industries and application due to their high safety level

Nylok® has been using by NASA satellites and many of the world's leading automobile, aircraft, machinery, and electrical appliance manufacturers. It also passed the Food Sanitation Law of Japan, this made Nylok® can be distribute to various industries application in Japan, including food manufacturing machinery, medical equipment, and nursing care equipment. It is used in many parts of Japan's Shinkansen bullet trains, such as windshield wipers at the very front of the train, door parts, screws that fasten to window frames, piles that fasten railroad tracks, overhead wires, and many other parts. Shinkansen trains run at speed exceeding 300 km/h, which causes tremendous vibration, but we have rarely heard of a serious accident caused by loosing screws. From the high safety and high quality of Nylok®'s products, it is a remarkable result of how effective they are in anti-loosening screw function.

▲ Nylok® technology supports the safe operation of the Shinkansen

“Anti-loosening Screws function” that can be used repeatedly

The greatest feature of Nylok® is "Anti-loosening Screw function" that can be used repeatedly. The ISO standard for "Anti-loosening Screws" explained that after tightening a screw, the return torque (torque when loosening the screw) must be measured and must be above a certain value. The blue line in the figure below shows that the torque value of the Nylok® applied screw decreases from the first time to the second time, then to the third time, and then, but the value is constant from about the seventh time. The reason why the value decreases from the first to the second time and then because Nylok® is made of nylon, Nylok®'s shape after fastened will become flatter and cover the thread of the screw, this made the very first value reduce greatly. However, this value is much higher than the minimum return torque value set by the ISO. This means that even after repeated use, the screw remains highly effective as an anti-loosening screw.

▲ Graph of change in torque values resulting from repeated testing of a hexagonal bolt with the Nylok® processing
Information materials provided by Taiyo Sanko Co., Ltd.

Can be apply for many types of fasteners in various sizes and materials

Another feature of Nylok® is, It can be apply for many types fasteners in various sizes and materials. Anti-loosening screws are often made on nuts and washers, but Nylok® can be applied to either male or female threads. Nylok® can be processed with not only general standard products such as cap screws, set screws, small screws, and hexagon bolts but also with customized products. Also, depending on the shape, it is possible to apply on fine M1 screws and also large screws such as M24, alloy steels such as iron, SCM435, and stainless steel.

▲ Sample of Nyloc processed products
*Application for special material is required consult from us first, such as brass which are difficult to apply.

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.