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In the first place, a special wear inspection gauge is required to check the wear condition of the gauge .
Originally, if the effective diameter of the internal thread is not larger than that of the external thread , it will not fit together as a screw.
The effective diameter tolerance range is larger for GP, which measures the minimum effective diameter of internal thread , than for GR, which measures the maximum effective diameter of external thread .
Therefore, they usually do not fit together.
In the unlikely event that they do fit, it indicates an abnormality in accuracy.
(FAQID:231)