There are threads that do not loose, but the female screw, the male screw, and all the materials are made of special items and are very costly and not easy to use.It is very difficult for the existing loose thread to enter the right and left sides of the screw. To solve this problem, the diameter of the forward screw portion is increased, and the diameter of the reverse screw portion is reduced. By doing this, the nut for the forward screw can reach the forward screw, and the thing having the same effect is completed. In addition, I want to use an ordinary nut so that it is not loosened by connecting two nuts with a hexagon protection cover.Diagram
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