Metric Cut Tap Drills
46 rows
Cut-tap drill sizes for ISO metric threads, with the percentage of thread each drill gives. For another thread percentage, or the drills either side, use the Tap Drill Calculator.
| Tap | Pitch | Cut tap drill | Thread % |
|---|---|---|---|
| M1.6 | 0.35 | 1.25 mm | 77% |
| M1.8 | 0.35 | 1.45 mm | 77% |
| M2 | 0.4 | 1.6 mm | 77% |
| M2.2 | 0.45 | 1.75 mm | 77% |
| M2.5fine | 0.35 | 2.15 mm | 77% |
| M2.5 | 0.45 | 2.05 mm | 77% |
| M3fine | 0.35 | 2.65 mm | 77% |
| M3 | 0.5 | 2.5 mm | 77% |
| M3.5 | 0.6 | 2.9 mm | 77% |
| M4fine | 0.5 | 3.5 mm | 77% |
| M4 | 0.7 | 3.3 mm | 77% |
| M5 | 0.8 | 4.2 mm | 77% |
| M6fine | 0.75 | 5.25 mm | 77% |
| M6 | 1.0 | 5.0 mm | 77% |
| M7fine | 0.5 | 6.5 mm | 77% |
| M7 | 1.0 | 6.0 mm | 77% |
| M8fine | 1.0 | 7.0 mm | 77% |
| M8 | 1.25 | 6.8 mm | 74% |
| M10fine | 1.0 | 9.0 mm | 77% |
| M10fine | 1.25 | 8.75 mm | 77% |
| M10 | 1.5 | 8.5 mm | 77% |
| M12fine | 1.25 | 10.75 mm | 77% |
| M12fine | 1.5 | 10.5 mm | 77% |
| M12 | 1.75 | 10.2 mm | 79% |
| M14fine | 1.5 | 12.5 mm | 77% |
| M14 | 2.0 | 12.0 mm | 77% |
| M16fine | 1.5 | 14.5 mm | 77% |
| M16 | 2.0 | 14.0 mm | 77% |
| M18fine | 1.5 | 16.5 mm | 77% |
| M18 | 2.5 | 15.5 mm | 77% |
| M20fine | 1.5 | 18.5 mm | 77% |
| M20 | 2.5 | 17.5 mm | 77% |
| M22fine | 1.5 | 20.5 mm | 77% |
| M22 | 2.5 | 19.5 mm | 77% |
| M24fine | 2.0 | 22.0 mm | 77% |
| M24 | 3.0 | 21.0 mm | 77% |
| M27fine | 2.0 | 25.0 mm | 77% |
| M27 | 3.0 | 24.0 mm | 77% |
| M30fine | 2.0 | 28.0 mm | 77% |
| M30 | 3.5 | 26.5 mm | 77% |
| M33fine | 2.0 | 31.0 mm | 77% |
| M33 | 3.5 | 29.5 mm | 77% |
| M36fine | 3.0 | 33.0 mm | 77% |
| M36 | 4.0 | 32.0 mm | 77% |
| M39fine | 3.0 | 36.0 mm | 77% |
| M39 | 4.0 | 35.0 mm | 77% |
Sizes and pitches: ISO 261. Drill = major diameter − pitch.