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| THREAD DATA CHART | ||||||||
|---|---|---|---|---|---|---|---|---|
| British Thread (British Standard Fine) — Fine Pitch | ||||||||
| Nominal Size BSF | 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 |
| 3/16″ | BSF | 4.763 | 0.794 | 32 | 4.255 | 3.747 | 0.508 | 4.00 |
| 7/32″ | BSF | 5.556 | 0.907 | 28 | 4.975 | 4.394 | 0.581 | 4.60 |
| 1/4″ | BSF | 6.350 | 0.977 | 26 | 5.725 | 5.100 | 0.625 | 5.30 |
| 9/32″ | BSF | 7.142 | 0.977 | 26 | 6.518 | 5.893 | 0.625 | 6.10 |
| 5/16″ | BSF | 7.938 | 1.156 | 22 | 7.199 | 6.459 | 0.739 | 6.80 |
| 3/8″ | BSF | 9.525 | 1.27 | 20 | 8.712 | 7.899 | 0.813 | 8.30 |
| 7/16″ | BSF | 11.113 | 1.411 | 18 | 10.209 | 9.304 | 0.904 | 9.70 |
| 1/2″ | BSF | 12.700 | 1.588 | 16 | 11.684 | 10.668 | 1.017 | 11.10 |
| 9/16″ | BSF | 14.288 | 1.588 | 16 | 13.272 | 12.256 | 1.017 | 12.70 |
| 5/8″ | BSF | 15.875 | 1.814 | 14 | 14.712 | 13.549 | 1.162 | 14.00 |
| 11/16″ | BSF | 17.463 | 1.814 | 14 | 16.300 | 15.137 | 1.162 | 15.50 |
| 3/4″ | BSF | 19.050 | 2.117 | 12 | 17.693 | 16.336 | 1.355 | 16.75 |
| 13/16″ | BSF | 20.638 | 2.117 | 12 | 19.281 | 17.924 | 1.355 | 18.25 |
| 7/8″ | BSF | 22.225 | 2.309 | 11 | 20.747 | 19.269 | 1.479 | 19.75 |
| 1″ | BSF | 25.400 | 2.54 | 10 | 23.774 | 22.148 | 1.627 | 22.75 |
| 1-1/8″ | BSF | 28.575 | 2.822 | 9 | 26.769 | 24.963 | 1.807 | 26.50 |
| 1-1/4″ | BSF | 31.750 | 2.822 | 9 | 29.944 | 28.138 | 1.807 | 28.75 |
| 1-3/8″ | BSF | 34.925 | 3.175 | 8 | 32.893 | 30.861 | 2.033 | 31.50 |
| 1-1/2″ | BSF | 38.100 | 3.175 | 8 | 36.068 | 34.036 | 2.033 | 34.50 |
| 1-5/8″ | BSF | 41.275 | 3.175 | 8 | 39.243 | 37.211 | 2.033 | 38.00 |
| 1-3/4″ | BSF | 44.450 | 3.629 | 7 | 42.126 | 39.802 | 2.324 | 40.50 |
| 2″ | BSF | 50.800 | 3.629 | 7 | 48.476 | 46.152 | 2.324 | 47.00 |
| 2-1/4″ | BSF | 57.150 | 4.234 | 6 | 54.440 | 51.730 | 2.711 | 53.00 |
| 2-1/2″ | BSF | 63.500 | 4.234 | 6 | 60.790 | 58.080 | 2.711 | 59.00 |
| 2-3/4″ | BSF | 69.850 | 4.234 | 6 | 67.140 | 64.430 | 2.711 | n/a |
| 3″ | BSF | 76.200 | 5.08 | 5 | 72.946 | 69.692 | 3.253 | n/a |
| 3-1/4″ | BSF | 82.550 | 5.08 | 5 | 79.296 | 76.042 | 3.253 | n/a |
| 3-1/2″ | BSF | 88.900 | 5.645 | 4 1/2 | 85.285 | 81.670 | 3.614 | n/a |
| 3-3/4″ | BSF | 95.250 | 5.645 | 4 1/2 | 91.635 | 88.020 | 3.614 | n/a |
| 4″ | BSF | 101.600 | 5.645 | 4 1/2 | 97.985 | 94.370 | 3.614 | n/a |
| 4-1/4″ | BSF | 107.950 | 6.35 | 4 | 103.886 | 99.822 | 4.066 | n/a |
Weights are in kilograms per 1,000 pieces unless otherwise specified. All weights are approximations and strictly informative.