Thread diameter is an important indicator of thread interchangeability. The calculation of the thread pitch error and the half-angle error of the tooth diameter is essential for judging the qualification of the thread diameter. In this paper, the calculation formula of the pitch error and the half-angle error of the tooth type is given, which has certain reference value for the correct implementation of the thread standard and the accurate thread diameter. Since the thread tolerance standard specifies the tolerances of the top, middle and bottom diameters of the thread, the thread diameter is a measure of the thread interchange.
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