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There are three ways to do this:
(1) Measurement by the three-needle method
JIS B0271
(2) Calibration
(3) Judgment by wear inspection ring gauge
The wear inspection screw ring gauge is a ring gauge that checks whether the effective diameter of the limit plug gauge for screws is within the tolerance range including the wear allowanc
For NPTF gauges for U.S.-type pipes, the central notch of the L1 gauge (three-stage notch) indicates the reference diameter, and the other two notches indicate the maximum and minimum allowable notches.
To use the gauge, screw it into the gauge until the screw stops, and if the pipe end of the screw to be inspected is within the range of the maximum and minimum notches, it
The use of screw gauges is determined by JIS standards.
Use the accuracy grade of the drawing instruction and inspect the screws according to the prescribed method.
[Limit gauge for screws types and how to use them]
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