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 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) | |||
 | 6 | 28 | 0.907 | 0.581 | 9.728 | 9.147 | 8.566 |
 | 8 | 19 | 1.337 | 0.856 | 13.157 | 12.301 | 11.445 |
| 10 | 19 | 1.337 | 0.856 | 16.662 | 15.806 | 14.950 ... | |
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