The thread gauge half-angle error Δα/2 refers to the difference between the actual tooth half angle α'/2 and the basic tooth half angle α/2, that is, Δα/2=α'/2-α/2 has the tooth half angle error, Interference occurs on the flank to affect the screw-in property, affecting the contact area between the flank, and reducing the joint strength. Therefore, the half-angle error of the thread gauge must be controlled. In the actual measurement, in order to eliminate the non-parallel caused by the axis of the thread gauge and the longitudinal guide of the instrument.
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