Elements Of Hexagon Bolts

Tooth type: On the section passing through the thread axis, the profile shape of the thread is called the tooth type. The angle between two adjacent flanks is called the profile angle. Commonly used common thread has a triangular profile with a profile angle of 60°. Major diameter, minor diameter and intermediate diameter: Major diameter refers to the diameter of an imaginary cylindrical or tapered surface that coincides with the top of the external thread and the bottom of the internal thread. The major diameter is represented by D. Number of threads: The number of spiral threads forming a thread is called the number of threads. There are single-thread and multi-thread threads. Multi-thread threads are evenly distributed in a section perpendicular to the axis. Lead: The axial distance between two adjacent teeth on the pitch line corresponding to two points is called the pitch. On the same spiral line, the axial distance between two adjacent teeth on the median diameter line corresponding to two points is called the lead. The relationship between the number of wires n, the pitch P, and the lead S is: S=n·P. Rotation direction: viewed along the axis, the clockwise rotation of the hexagonal bolt becomes a right-hand thread, and the counterclockwise rotation is called a left-hand thread.