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Drill Sizes for Metric Taps
The table below shows the drill hole sizes for standard metric (coarse) threads and metric fine threads.
Metric & Metric Fine Tap Drill Chart
| Ø | Metric | Metric Fine | ||||
|---|---|---|---|---|---|---|
| Pitch | Drill Size | Pitch | Drill Size | |||
| mm | in | mm | in | |||
| M1.6 | 0.35 | 1.25 | 3/64 | – | – | – |
| M1.8 | 0.35 | 1.45 | 0.059 (#53) | – | – | – |
| M2 | 0.4 | 1.6 | 0.063 (#52) | – | – | – |
| M2.2 | 0.45 | 1.75 | 0.070 (#50) | – | – | – |
| M2.5 | 0.45 | 2.05 | 0.081 (#46) | – | – | – |
| M3 | 0.5 | 2.5 | 0.099 (#39) | – | – | – |
| M3.5 | 0.6 | 2.9 | 0.116 (#32) | – | – | – |
| M4 | 0.7 | 3.3 | 0.128 (#30) | – | – | – |
| M4.5 | 0.75 | 3.7 | 0.147 (#26) | – | – | – |
| M5 | 0.8 | 4.2 | 0.166 (#19) | – | – | – |
| M6 | 1 | 5 | 0.199 (#8) | – | – | – |
| M7 | 1 | 6 | 0.238 (B) | – | – | – |
| M8 | 1.25 | 6.8 | 0.266 (H) | 1 | 7 | 0.277 (J) |
| M10 | 1.5 | 8.5 | 0.339 (R) | 1.25 | 8.8 | 11/32 |
| M12 | 1.75 | 10.2 | 0.404 (Y) | 1.5 | 10.5 | 0.413 (Z) |
| M14 | 2 | 12 | 15/32 | 1.5 | 12.5 | 1/2 |
| M16 | 2 | 14 | 9/16 | 1.5 | 14.5 | 37/64 |
| M18 | 2.5 | 15.5 | 39/64 | 1.5 | 16.5 | 21/32 |
| M20 | 2.5 | 17.5 | 11/16 | 1.5 | 18.5 | 47/64 |
| M22 | 2.5 | 19.5 | 49/64 | 1.5 | 20.5 | 13/16 |
| M24 | 3 | 21 | 53/64 | 2 | 22 | 7/8 |
| M27 | 3 | 24 | 61/64 | 2 | 25 | 63/64 |
| M30 | 3.5 | 26.5 | 1-3/64 | 2 | 28 | 1-7/64 |
| M33 | 3.5 | 29.5 | 1-11/64 | 2 | 31 | 1-7/32 |
| M36 | 4 | 32 | 1-17/64 | 3 | 33 | 1-19/64 |
| M39 | 4 | 35 | 1-25/64 | 3 | 36 | 1-27/64 |