The data chart below shows the standard metric ‘coarse’ threads and their drill holes sizes were are most commonly used when tapping sheet metal fabrications.
METRIC COARSE THREAD SIZES in mm |
Tap Size |
Drill size |
M2 x 0.4 |
1.6 |
M2.5 x 0.45 |
2.05 |
M3 x 0.5 |
2.5 |
M3.5 x 0.6 |
2.9 |
M4 x 0.7 |
3.3 |
M4.5 x 0.75 |
3.7 |
M5 x 0.8 |
4.2 |
M6 x 1.0 |
5.0 |
M7 x 1.0 |
6.0 |
M8 x 1.25 |
6.8 |
M9 x 1.25 |
7.8 |
M10 x 1.5 |
8.5 |
M11 x 1.5 |
9.5 |
M12 x 1.75 |
10.2 |
M14 x 2.0 |
12 |
M16 x 2.0 |
14 |
M18 x 2.5 |
15.5 |
M20 x 2.5 |
17.5 |
As well as being able to drill holes are then tap put threads we can also CNC punch and cut threads on our Trumpf 3000 CNC punch press.
For more information on CNC punching please take a look at our “What is CNC Punching page“.