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- Metric Tapping Drills - coarse
- Metric Tapping Drills - fine
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British Standard Fine (BSF) tapping drill sizes.
| Nominal Dia Pitch | Pitch TPI | Tapping drill Dia mm |
|---|---|---|
| 3/16" | 32 | 4.00 |
| 7/32" | 28 | 4.60 |
| 1/4" | 26 | 5.30 |
| 9/32" | 26 | 6.10 |
| 5/16" | 22 | 6.80 |
| 3/8" | 20 | 8.30 |
| 7/16" | 18 | 9.70 |
| 1/2" | 16 | 11.10 |
| 9/16" | 16 | 12.70 |
| 5/8" | 14 | 14.00 |
| 11/16" | 14 | 15.50 |
| 3/4" | 12 | 16.75 |
| 7/8" | 11 | 19.75 |
| 1" | 10 | 22.75 |
| 1.1/8" | 9 | 25.50 |
| 1.1/4" | 9 | 28.50 |
| 1.3/8" | 8 | 31.50 |
| 1.1/2" | 8 | 34.50 |