The Five Thread Elements of Triangular Screws

For the thread of a triangular screw, if the three elements of pitch, profile, and diameter can meet the requirements of a standard thread, it is called a standard thread. Standard threads have clear tolerance zones and thread marking requirements. As for the two elements of thread direction and number of threads, they are not fixed and unchanging. Generally speaking, if there is no special marking, it is usually a single line right rotation. If you want the internal and external threads of a screw to fit together, you must ensure that the five thread elements of tooth shape, diameter, direction, number of threads, and pitch are consistent.
Let's talk about the thread elements of triangular screws in detail below:
1. Tooth shape. What is tooth shape? It is through the profile of the thread axis that the contour and shape of the thread will have an angle between the adjacent sides of the two teeth, which is called the tooth angle. Generally, ordinary threads have a triangular tooth shape and a tooth angle of 60 °.
2. Diameter. The diameter of threads can be divided into major diameter, medium diameter, and minor diameter. When representing threads, the nominal diameter is used, which is the diameter of the thread size. Ordinary threads use a major diameter.
3. Rotation direction. When viewed along the axis, if the thread rotates clockwise, it belongs to right-handed threads, and vice versa, it belongs to left-handed threads.
4. Number of lines. The number of threads is actually the specific number of helical threads that form the thread. It can be divided into single thread and multi thread, and multi thread often needs to be evenly distributed in the section perpendicular to the axis.
5. Pitch. The axial distance between adjacent teeth on the same spiral line and the corresponding diameter line is the size of the screw pitch, which cannot be arbitrarily determined.
It can be known that the five major thread elements of triangular screws are tooth shape, diameter, direction of rotation, number of threads, and pitch. If producers want to produce screws that meet quality requirements, they should master these five thread elements.