4.1.38 ISO Pipe threads, tapered: basic sizes

Terms relating to taper pipe threads


ISO pipe threads, tapered: basic sizes (see Tables 1 and 2).

Table 1

Nominal (bore) size of pipe aNumber of threads per inchPitch of thread (mm)Depth of thread (mm)Basic diameters at gauge plane
in.mmMajor (gauge) diameter (mm)Pitch (effective) diameter (mm)Minor diameter (mm)
3810191.3370.85616.66215.80614.950 ...

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