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This post was last edited by Thank goodness you're here on 2016-11-29 at 16:21: http://yafan1.gz005.abaizx.com/upload/image/20161128/20161128183133_8581.png Lock nut: Other names include root nut, anti-loosening nut, and retaining nut. Use: To secure threaded outer fittings or other pipe fittings. The working principle of a nut is self-locking through the friction between the nut and the bolt. However, the reliability of this self-locking mechanism decreases under dynamic loads. On some important occasions, we take certain anti-loosening measures to ensure the reliability of nut locking. Using lock nuts is one such anti-loosening measure. There are also three types of lock nuts: The first type uses two identical nuts screwed onto the same bolt, with a tightening torque applied between the two nuts to ensure a reliable bolt connection. The second type are specialized locknuts, which need to be used together with a lock washer. The special anti-loosening nut is not a hexagonal nut, but rather a round nut with 3, 4, 6, or 8 notches around its circumference (depending on the size of the nut and the manufacturer’s product line). These notches serve as the points where the tightening tool exerts force, as well as the places where the anti-loosening washer is secured in place. The third type features through-threaded holes drilled from the outer circular surface of the nut to its inner threaded surface (usually 2 holes, arranged at 90 degrees to each other on the outer surface), which are used to insert small-diameter set screws. The purpose of this is to apply a force in a centripetal direction to the threads, thereby preventing the lock nut from coming loose. High-quality locking nuts available on the market have small copper pieces embedded in their inner circular surface, matching the threads of the nut; these pieces are used to prevent the screw used for radial tightening from coming into direct contact with the threaded part being secured, thereby avoiding damage to the latter. This type of lock nut has begun to be used increasingly in applications where it is necessary to secure the shaft ends of components that undergo rotational motion, such as for preventing loosening of the bearings at the installation end of ball screws. The second anti-loosening method is more reliable than the first, but its structure is relatively complex. Compared to the first two types, the third type offers better anti-loosening performance, a simpler and more aesthetically pleasing design, as well as a smaller axial dimension.