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Wood Screws thread main elements

2018-05-18


The main thread elements of the triangular screw include: six types of elements: tooth type, large (medium/small) diameter, number of threads, lead, rotation direction and working height. The thread profile is used to determine the thread geometry. Only when these six elements are identical, the internal and external threads can be screwed together.
1. Profile: In the section passing through the thread axis, the profile of the thread is called profile. The angle between two adjacent flank faces is called the angle of the tooth. The common thread has a triangular shape and a tooth angle of 60°.
2. Large diameter, small diameter, and medium diameter: Large diameter refers to the diameter of the imaginary cylinder or cone that coincides with the crest of the external thread and the bottom of the internal thread. The large diameter of the external thread is denoted by d. The major diameter is represented by D. The small diameter refers to the diameter of an imaginary cylinder or cone that coincides with the top of the external thread and the top of the internal thread. The minor diameter of the external thread is denoted by d1, and the minor diameter of the internal thread is denoted by D1. Between the large diameter and the small diameter, it is assumed that there is a cylinder (or cone). In the section of the shaft, the tooth width and the groove width on the plain line are equal. The diameter of the imaginary cylinder is called the middle diameter. Use d2 ( Or D2).
3. Number of lines: The number of spirals forming a thread is called the number of lines. There are single- and multi-thread threads, and the multi-thread threads are evenly distributed in the section perpendicular to the axis.

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