ISO 7-1 Tapered Threads | |||||||||||
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Pipe Size (inches) | Threads per Inch P (TPI) | Lead p (mm) | Outside Diameter d = D (mm) | Pitch Diameter d2 = D2 (mm) | Minor Diameter d1 = D1 (mm) | Rp/Rc R | a | Tolerances of Internal Thread | Tolerances of External Thread | ||
(mm) | Pitch Diameter (mm) | turns | turns | (mm) | |||||||
1/16 | 28 | 0.907 | 7.723 | 7.142 | 6.561 | 1/16 | 4 | ± 0.071 | ± 1 1/4 | ± 1 | ± 0.9 |
1/8 | 28 | 0.907 | 9.23 | 9.147 | 8.566 | 1/8 | 4 | ± 0.071 | ± 1 1/4 | ± 1 | ± 0.9 |
1/4 | 19 | 1.337 | 13.157 | 12.301 | 11.445 | 1/4 | 6 | ± 0.104 | ± 1 1/4 | ± 1 | ± 1.3 |
3/8 | 19 | 1.337 | 16.662 | 15.806 | 14.950 | 3/8 | 6.4 | ± 0.104 | ± 1 1/4 | ± 1 | ± 1.3 |
1/2 | 14 | 1.814 | 20.955 | 19.793 | 18.631 | 1/2 | 8.2 | ± 0.142 | ± 1 1/4 | ± 1 | ± 1.8 |
5/8 | 14 | 1.814 | 22.911 | 21.749 | 20.587 | ||||||
3/4 | 14 | 1.814 | 26.441 | 25.279 | 24.117 | 3/4 | 9.5 | ± 0.142 | ± 1 1/4 | ± 1 | ± 1.8 |
7/8 | 14 | 1.814 | 30.201 | 29.039 | 27.877 | ||||||
1 | 11 | 2.309 | 33.249 | 31.770 | 30.291 | 1 | 10.4 | ± 0.18 | ± 1 1/4 | ± 1 | ± 2.3 |
1 1/8 | 11 | 2.309 | 37.897 | 36.418 | 34.939 | ||||||
1 1/4 | 11 | 2.309 | 41.910 | 40.431 | 38.952 | 1 1/4 | 12.7 | ± 0.18 | ± 1 1/4 | ± 1 | ± 2.3 |
1 1/2 | 11 | 2.309 | 47.803 | 46.324 | 44.845 | 1 1/2 | 12.7 | ± 0.18 | ± 1 1/4 | ± 1 | ± 2.3 |
1 3/4 | 11 | 2.309 | 53.746 | 52.267 | 50.788 | ||||||
2 | 11 | 2.309 | 59.614 | 58.135 | 56.656 | 2 | 15.9 | ± 0.18 | ± 1 1/4 | ± 1 | ± 2.3 |
2 1/4 | 11 | 2.309 | 65.710 | 64.231 | 62.752 | ||||||
2 1/2 | 11 | 2.309 | 75.184 | 73.705 | 72.226 | 2 1/2 | 17.5 | ± 0.216 | ± 1 1/2 | ± 1 1/2 | ± 3.5 |
2 3/4 | 11 | 2.309 | 81.534 | 80.055 | 78.576 | ||||||
3 | 11 | 2.309 | 87.884 | 86.405 | 84.926 | 3 | 20.6 | ± 0.216 | ± 1 1/2 | ± 1 1/2 | ± 3.5 |
Nominal Pipe Size (inches) | Length of Thread (inches) |
---|---|
1/8 | 0.27 |
1/4 | 0.39 |
3/8 | 0.41 |
1/2 | 0.53 |
3/4 | 0.55 |
1 | 0.66 |
1 1/4 | 0.68 |
1 1/2 | 0.68 |
2 | 0.70 |
2 1/2 | 0.93 |
3 | 1.02 |
4 | 1.09 |
5 | 1.19 |
6 | 1.21 |