BSPP Pipe Threads: Dimensions of 'G' Threads
| Dimensions Of 'G' Threads (BSPP) Pipe Threads | ||||||||||||
| Size | External Threads | Internal Threads | ||||||||||
| Major Ø | Pitch Ø | Pitch Ø | Minor Ø | Minor Ø | Pitch Ø | Major Ø | ||||||
| Class 'A' | Class 'B' | |||||||||||
| Max. | Min. | Max. | Min. | Max. | Min | Max. | Min. | Max. | Min. | Max. | Min. | |
| G 1/16 | 7.723 | 7.509 | 7.142 | 7.035 | 7.142 | 6.928 | 6.561 | 6.561 | 6.843 | 7.142 | 7.249 | 7.723 |
| G 1/8 | 9.728 | 9.514 | 9.147 | 9.04 | 9.147 | 8.933 | 8.566 | 8.566 | 8.848 | 9.147 | 9.254 | 9.728 |
| G 1/4 | 13.157 | 12.907 | 12.301 | 12.176 | 12.301 | 12.051 | 11.445 | 11.445 | 11.89 | 12.301 | 12.426 | 13.157 |
| G 3/8 | 16.662 | 16.412 | 15.806 | 15.681 | 15.806 | 15.556 | 14.95 | 14.95 | 15.395 | 15.806 | 15.931 | 16.662 |
| G 1/2 | 20.955 | 20.671 | 19.793 | 19.651 | 19.793 | 19.509 | 18.631 | 18.631 | 19.172 | 19.793 | 19.935 | 20.955 |
| G 5/8 | 22.911 | 22.627 | 21.749 | 21.607 | 21.749 | 21.465 | 20.587 | 20.587 | 21.128 | 21.749 | 21.891 | 22.911 |
| G 3/4 | 26.441 | 26.157 | 25.279 | 25.137 | 25.279 | 24.995 | 24.117 | 24.117 | 24.658 | 25.279 | 25.421 | 26.441 |
| G 7/8 | 30.201 | 29.917 | 29.039 | 28.897 | 29.039 | 28.755 | 27.877 | 27.877 | 28.418 | 29.039 | 29.181 | 30.201 |
| G 1 | 33.249 | 32.889 | 31.77 | 31.59 | 31.77 | 31.41 | 30.291 | 30.291 | 30.931 | 31.77 | 31.95 | 33.249 |
| G 1.1/8 | 37.897 | 37.537 | 36.418 | 36.238 | 36.418 | 36.058 | 34.939 | 34.939 | 35.579 | 36.418 | 36.598 | 37.897 |
| G 1.1/4 | 41.91 | 41.55 | 40.431 | 40.251 | 40.431 | 40.071 | 38.952 | 38.952 | 39.592 | 40.431 | 40.611 | 41.91 |
| G 1.1/2 | 47.803 | 47.443 | 46.324 | 46.144 | 46.324 | 45.964 | 44.845 | 44.845 | 45.485 | 46.324 | 46.504 | 47.803 |
| G 1.3/4 | 53.746 | 53.386 | 52.267 | 52.087 | 52.267 | 51.907 | 50.788 | 50.788 | 51.428 | 52.267 | 52.447 | 53.746 |
| G 2 | 59.614 | 59.254 | 58.135 | 57.955 | 58.135 | 57.775 | 56.656 | 56.656 | 57.296 | 58.135 | 58.315 | 59.614 |
| G 2.1/4 | 65.71 | 65.276 | 64.231 | 64.014 | 64.231 | 63.797 | 62.752 | 62.752 | 63.392 | 64.231 | 64.448 | 65.71 |
| G 2.1/2 | 75.184 | 74.75 | 73.705 | 73.488 | 73.705 | 73.271 | 72.226 | 72.226 | 72.866 | 73.705 | 73.922 | 75.184 |
| G 2.3/4 | 81.534 | 81.1 | 80.055 | 79.838 | 80.055 | 79.621 | 78.576 | 78.576 | 79.216 | 80.055 | 80.272 | 81.534 |
| G 3 | 87.884 | 87.45 | 86.405 | 86.188 | 86.405 | 85.971 | 84.926 | 84.926 | 85.566 | 86.405 | 86.622 | 87.884 |
| G 3.1/2 | 100.33 | 99.896 | 98.851 | 98.634 | 98.851 | 98.417 | 97.372 | 97.372 | 98.012 | 98.851 | 99.068 | 100.33 |
| G 4 | 113.03 | 112.596 | 111.551 | 111.334 | 111.551 | 111.117 | 110.072 | 110.072 | 110.712 | 111.551 | 111.768 | 113.03 |
| G 4.1/2 | 125.73 | 125.296 | 124.251 | 124.034 | 124.251 | 123.817 | 122.772 | 122.772 | 123.412 | 124.251 | 124.468 | 125.73 |
| G 5 | 138.43 | 137.996 | 136.951 | 136.734 | 136.951 | 136.517 | 135.472 | 135.472 | 136.112 | 136.951 | 137.168 | 138.43 |
| G 5.1/2 | 151.13 | 150.696 | 149.651 | 149.434 | 149.651 | 149.217 | 148.172 | 148.172 | 148.812 | 149.651 | 149.868 | 151.13 |
| G 6 | 163.83 | 163.396 | 162.351 | 162.134 | 162.351 | 161.917 | 160.872 | 160.872 | 161.512 | 162.351 | 162.568 | 163.83 |