There are many types of double ended threaded bar. According to the direction of rotation of the double ended threaded rod home depot. there are two types: the same direction and the reverse direction. 　　1. The effect of the double sided threaded rod in the same direction:(1) When the main body is large scale equipment, it needs to install accessories, such as sight glass, mechanical seal seat, reduction frame, etc. This is the double end threaded stud bolts used, one end is screwed into the main body, and the other end is attached after the accessories are installed. Nuts, because the accessories are often disassembled, the threads will be worn or damaged, and it is very convenient to use studs to replace them. 　　(2) When the thickness of the connecting body is very large, and the length of the bolt is very long, stud bolts are used, which is more convenient to manufacture. 　　2. The two double ended threaded stud have the opposite direction of rotation, which is mainly used to connect two relatively fixed components. The distance or tension between the two components can be adjusted simply and conveniently.