| British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) | ||||||||||
| Nominal Size BSPP/BSPF |
Thread Form Type |
Major Diameter mm d=D |
Pitch mm p |
Threads per inch tpi |
Pitch Diameter mm d2=D2 |
Minor Diameter Male Thd. d3 |
Thread Height H1 |
Tap Drill Diameter mm |
||
| 1/8" | BSPP/BSPF | 9.728 | 0.907 | 28 | 9.147 | 8.566 | 0.581 | 8.70 | ||
| 1/4" | BSPP/BSPF | 13.157 | 1.337 | 19 | 12.301 | 11.445 | 0.856 | 11.60 | ||
| 3/8" | BSPP/BSPF | 16.662 | 1.337 | 19 | 15.806 | 14.950 | 0.856 | 15.00 | ||
| 1/2" | BSPP/BSPF | 20.955 | 1.814 | 14 | 19.793 | 18.631 | 1.162 | 19.00 | ||
| 5/8" | BSPP/BSPF | 22.911 | 1.814 | 14 | 21.749 | 20.587 | 1.162 | 20.75 | ||
| 3/4" | BSPP/BSPF | 26.441 | 1.814 | 14 | 25.279 | 24.117 | 1.162 | 24.50 | ||
| 7/8" | BSPP/BSPF | 30.201 | 1.814 | 14 | 29.039 | 27.877 | 1.162 | 28.00 | ||
| 1" | BSPP/BSPF | 33.249 | 2.309 | 11 | 31.770 | 30.291 | 1.479 | 30.50 | ||
| 1 1/8" | BSPP/BSPF | 37.897 | 2.309 | 11 | 36.418 | 34.939 | 1.479 | 35.00 | ||
| 1 1/4" | BSPP/BSPF | 41.910 | 2.309 | 11 | 40.431 | 38.952 | 1.479 | 39.50 | ||
| 1 3/8" | BSPP/BSPF | 44.323 | 2.309 | 11 | 42.844 | 41.365 | 1.479 | 41.50 | ||
| 1 1/2" | BSPP/BSPF | 47.803 | 2.309 | 11 | 46.324 | 44.845 | 1.479 | 45.00 | ||
| 1 3/4" | BSPP/BSPF | 53.746 | 2.309 | 11 | 52.267 | 50.788 | 1.479 | 51.00 | ||
| 2" | BSPP/BSPF | 59.614 | 2.309 | 11 | 58.135 | 56.656 | 1.479 | 57.00 | ||
| 2 1/4" | BSPP/BSPF | 65.710 | 2.309 | 11 | 64.231 | 62.752 | 1.479 | 63.00 | ||
| 2 1/2" | BSPP/BSPF | 75.184 | 2.309 | 11 | 73.705 | 72.226 | 1.479 | 72.50 | ||
| 2 3/4" | BSPP/BSPF | 81.534 | 2.309 | 11 | 80.055 | 78.576 | 1.479 | 79.00 | ||
| 3" | BSPP/BSPF | 87.884 | 2.309 | 11 | 86.405 | 84.926 | 1.479 | 85.50 | ||
| 3 1/4" | BSPP/BSPF | 93.980 | 2.309 | 11 | 92.501 | 91.022 | 1.479 | 91.00 | ||
| 3 1/2" | BSPP/BSPF | 100.330 | 2.309 | 11 | 98.351 | 97.372 | 1.479 | 97.75 | ||
| 3 3/4" | BSPP/BSPF | 106.680 | 2.309 | 11 | 105.201 | 103.722 | 1.479 | 104.00 | ||
| 4" | BSPP/BSPF | 113.030 | 2.309 | 11 | 111.550 | 110.072 | 1.479 | 110.50 | ||
| 4 1/2" | BSPP/BSPF | 125.730 | 2.309 | 11 | 124.251 | 122.772 | 1.479 | 123.00 | ||
| 5" | BSPP/BSPF | 138.430 | 2.309 | 11 | 136.951 | 135.472 | 1.479 | 136.00 | ||
| 5 1/2" | BSPP/BSPF | 151.130 | 2.309 | 11 | 149.651 | 148.172 | 1.479 | 148.50 | ||
| 6" | BSPP/BSPF | 163.830 | 2.309 | 11 | 162.351 | 160.872 | 1.479 | 161.50 | ||