What’s the use of a screw thread

What’s the use of a screw thread?Let’s analyze it.

First, the screw thread are divided into fine thread, coarse thread, AB thread, high and low thread, triangular thread and so on. Respectively make an analysis:

★The spiral angle of fine thread is smaller, which is more conducive to the self-locking of threads. Therefore, fine thread are generally used in places that need to prevent loose. Fine thread pitch is small, on the same screw thread length, the number of screw in more thread, which can reduce the role of fluid leakage, so it is used in need of sealing.

★The number of thread with the same length of coarse thread is less, and the section size of each thread is larger, and the force is good, which is more suitable for bearing greater tension and impact force.

★The upper limit of AB thread is inclined to negative tolerance. It can attack the thicker plate

★Unique double thread design of high and low thread screw, high thread (with large thread outside diameter) has a flatter and sharper thread.The low-thread (with a small outer diameter of the thread) has a high thread Angle and the thread height is only half of that of the high-thread. The high-thread thread reduces the rotary torque, improves the pull-out strength and greatly reduces the risk of breakage of the combined workpiece.High and low thread screws are especially suitable for plastics, parts board and wood.

★The triangular thread has self-locking function. The locking process will have a thermal effect

Today we will analyze the screw thread, hoping to help you. kalyn@szsst88.com         annie.li@szsst88.com