A question about threads?
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One of the instrument interface pipes is connected by threads; the measurement data； The tooth angle is 55 degrees, the number of teeth per inch is 18, the size code is 1/4, and it has a taper. How to label it? NPT? But it’s 55 degrees. G? There is also a taper. And it has 18 teeth. I’d like to ask everyone for advice
Z refers to the cone type. For Z-1/4, first you need to determine what standard is being used: British or American, and whether it’s fine thread or coarse thread. This information can be found in the manual.
I wish I could be sure about what the standards are.
The inner diameter of the end cloth also needs to be measured; then, by referring to the Machinery Parts Manual (Volume 2), one can determine how to mark it.
Since it is possible to determine that the tooth angle is 55 degrees and there are 18 teeth per inch, it can be confirmed that this is a British system; therefore, it should be labeled according to the imperial standards