ねじ・ゲージ | オーエスジー

The limit gauge measures the fit, not the length correctly.
Since there is a chamfer and an incomplete pile at the tip of the thread, it is not possible to make an accurate judgment.

For example, the imperfection of both end faces of a parallel screw gauge depends on the size and pitch, but is not less than 3/4 turn and no more than 1 turn.
Tape

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

For NPT 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 is ju

It is not available as a standard product, but will be handled as a special product. In addition, we generally recommend straight holes for pilot holes during tapered tapping processing.

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]

In gauge inspection, the accuracy of the drawing indication cannot be substituted for gauges of other precision.

This is true even if the gauge to be substituted is within the specified tolerance of accuracy.

 

As a rule for using gauges, the accuracy of the thread gauge must be consistent with the drawing instructions.

Only one accuracy c