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测量外螺纹中径除用三针量法以外,也可用双针量法来测量,如图所示。双针量法的用途比三针量法还要广泛,如螺纹圈数很少的螺纹,以及螺距大的螺纹(螺距大于6.5mm),都不便用三针量法测量,而用双针量法测量则简便可行。目前有关螺纹测量的书籍中,都有用双针量法测量螺纹中径的计算公式,现列出如下:对普通螺纹,牙形角α=60°
In addition to measuring the diameter of the external thread in addition to the three-needle method, it is also possible to measure the double-needle method as shown in the figure. The use of double-needle method than the three-needle method is also more widely used, such as the thread a small number of threads, as well as large pitch thread (pitch greater than 6.5mm), are not easy to measure with the three-pin method, Measurement method is simple and feasible. The current thread measurement books, there are two-way method of measuring the diameter of the thread diameter calculation formula is as follows: For ordinary thread, tooth angle α = 60 °