4.1.38 ISO Pipe threads, tapered: basic sizes

Terms relating to taper pipe threads

f04-45-9780750665087

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)
18si9_e6280.9070.5819.7289.1478.566
14si10_e8191.3370.85613.15712.30111.445
3810191.3370.85616.66215.80614.950 ...

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