Calibration method of threaded plug

Threaded plug is a tool for measuring internal screw thread size standard.

1, the appearance of inspection: with a magnifying glass or tool microscope, check whether there is a broken tooth or tooth deformation damage.

2, to be a school micrometer measuring GP and IP (or WP) diameter, read and record the measured value.

3, screw gauge of GP and IP (or WP) outside diameter specifications.

4, the difference between the measured value and the measured value as the basis for the judgment.

5, check unqualified, shall make correction to this gauge instrument, according to the check procedures.

6, if it can not be amended, it is necessary to limit the use or scrap.

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