Thread description
October 20, 2021
Thread 1. Thread is a shape with uniform helix protrusion on the section of the outer or inner surface of the solid. According to its structural characteristics and uses, it can be divided into three categories: (1) ordinary thread: the tooth shape is triangular, which is used to connect or fasten parts. Ordinary thread can be divided into coarse thread and fine thread according to pitch. Fine thread has high connection strength. （2） Transmission thread: tooth shapes include trapezoid, rectangle, saw shape and triangle. （3） Sealing thread: used for sealing connection, mainly pipe thread, conical thread and conical pipe thread.
A spiral shaped continuous convex part with a specific section made on the surface of a cylindrical or conical matrix. Threads are divided into cylindrical threads and conical threads according to their parent shape; It is divided into external thread and internal thread according to its position in the mother body, and it is divided into triangular thread, rectangular thread, trapezoidal thread, serrated thread and other special shape threads according to its section shape (tooth profile). Triangular thread is mainly used for connection, and rectangular, trapezoidal and serrated thread are mainly used for transmission; According to the helix direction, it is divided into left-hand thread and right-hand thread, generally right-hand thread; According to the number of helix, it can be divided into single thread, double thread and multi thread thread; The connection is mostly single wire, and the transmission is double wire or multi wire; According to the size of teeth, it can be divided into coarse thread and fine thread. According to different application occasions and functions, it can be divided into fastening thread, pipe thread, transmission thread, special thread, etc
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October 20, 2021
