### 4.1.38 ISO Pipe threads, tapered: basic sizes

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

Table 1

 Nominal (bore) size of pipe a Number of threads per inch Pitch of thread (mm) Depth of thread (mm) Basic diameters at gauge plane in. mm Major (gauge) diameter (mm) Pitch (effective) diameter (mm) Minor diameter (mm) $18$ 6 28 0.907 0.581 9.728 9.147 8.566 $14$ 8 19 1.337 0.856 13.157 12.301 11.445 $38$ 10 19 1.337 0.856 16.662 15.806 14.950 ...

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