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上海市松江区茸梅路345号3栋
British Standard Fine Thread Series (parallel,
cylindrical).
BSW and BSF are the Thread selections for commercial screws and nuts. The Fine
Thread, which is widespread in the Britisch machine tool industry, is
superseded by the American UNF Thread.
The flank angle is 55°
| Nominal | Major | Major | Tapping | TPI | Pitch |
| Diameter | Diameter | Diameter | Drill Size | mm | |
| Inch | mm | mm | |||
| BSF 3/16" | 0.1875 | 4.763 | 3.950 | 32 | 0.794 |
| BSF 7/32" | 0.2188 | 5.556 | 4.600 | 28 | 0.907 |
| BSF 1/4" | 0.2500 | 6.350 | 5.300 | 26 | 0.977 |
| BSF 9/32" | 0.2812 | 7.144 | 6.100 | 26 | 0.977 |
| BSF 5/16" | 0.3125 | 7.938 | 6.750 | 22 | 1.154 |
| BSF 3/8" | 0.3750 | 9.525 | 8.200 | 20 | 1.270 |
| BSF 7/16" | 0.4375 | 11.113 | 9.580 | 18 | 1.411 |
| BSF 1/2" | 0.5000 | 12.700 | 11.100 | 16 | 1.587 |
| BSF 9/16" | 0.5625 | 14.288 | 12.600 | 16 | 1.587 |
| BSF 5/8" | 0.6250 | 15.875 | 13.900 | 14 | 1.814 |
| BSF 11/16" | 0.6875 | 17.463 | 15.500 | 14 | 1.814 |
| BSF 3/4" | 0.7500 | 19.050 | 16.700 | 12 | 2.117 |
| BSF 7/8" | 0.8750 | 22.225 | 19.600 | 11 | 2.309 |
| BSF 1" | 1.0000 | 25.400 | 22.500 | 10 | 2.540 |
| BSF 1 1/8" | 1.1250 | 28.575 | 25.400 | 9 | 2.822 |
| BSF 1 1/4" | 1.2500 | 31.750 | 28.560 | 9 | 2.822 |
| BSF 1 3/8" | 1.3750 | 34.925 | 31.350 | 8 | 3.175 |
| BSF 1 1/2" | 1.5000 | 38.100 | 34.500 | 8 | 3.175 |
| BSF 1 5/8" | 1.6250 | 41.275 | 37.710 | 8 | 3.175 |
| BSF 1 3/4" | 1.7500 | 44.450 | 40.480 | 7 | 3.628 |
| BSF 2" | 2.0000 | 50.800 | 46.830 | 7 | 3.628 |
| BSF 2 1/4" | 2.2500 | 57.150 | 52.400 | 6 | 4.233 |
| BSF 2 1/2" | 2.5000 | 63.500 | 58.740 | 6 | 4.233 |
| BSF 2 3/4" | 2.7500 | 69.850 | 65.000 | 6 | 4.233 |
| BSF 3" | 3.0000 | 76.200 | 70.500 | 5 | 5.080 |
| BSF 3 1/4" | 3.2500 | 82.550 | 79.370 | 5 | 5.080 |
| BSF 3 1/2" | 3.5000 | 88.900 | 82.550 | 4.5 | 5.644 |
| BSF 3 3/4" | 3.7500 | 95.250 | 88.900 | 4.5 | 5.644 |
| BSF 4" | 4.0000 | 101.600 | 95.250 | 4.5 | 5.644 |
| BSF 4 1/4" | 4.2500 | 107.950 | 101.600 | 4 | 6.350 |
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