National Taper Pipe, NPT Internal Threads, Bore Diameter

We use this chart when making female NPT threads in our fittings. The data is based on practical experience with Go/No-Go gauges fitting threads. If you use reamer having the target diameter, your CNC operator can figure out the rest of the taper machined into the fitting. Use the Target Dia. from the attached table; your product will fit and will pass the inspection with the gauges.

We made a video about it.

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