Metric Tap Drill Quick Reference
Printable shop wall chart: Metric Tap Drill Quick Reference. Free letter-size PDF to print and post at the counter; 25 x 36 inch poster version available.
| Size | Coarse pitch | Coarse tap drill | Fine pitch | Fine tap drill |
|---|---|---|---|---|
| M2 | 0.4 | 1.6 | - | - |
| M2.5 | 0.45 | 2.05 | - | - |
| M3 | 0.5 | 2.5 | - | - |
| M4 | 0.7 | 3.3 | - | - |
| M5 | 0.8 | 4.2 | - | - |
| M6 | 1.0 | 5.0 | 0.75 | 5.25 |
| M8 | 1.25 | 6.8 | 1.0 | 7.0 |
| M10 | 1.5 | 8.5 | 1.25 | 8.8 |
| M12 | 1.75 | 10.2 | 1.25 | 10.8 |
| M14 | 2.0 | 12.0 | 1.5 | 12.5 |
| M16 | 2.0 | 14.0 | 1.5 | 14.5 |
| M18 | 2.5 | 15.5 | 1.5 | 16.5 |
| M20 | 2.5 | 17.5 | 1.5 | 18.5 |
| M22 | 2.5 | 19.5 | 1.5 | 20.5 |
| M24 | 3.0 | 21.0 | 2.0 | 22.0 |
| M30 | 3.5 | 26.5 | 2.0 | 28.0 |
Rule of thumb: drill = D - P gives about 75% thread. Thread-forming taps need larger drills.
These tables carry the same figures as the printed sheet below.
The printed sheet
25 x 36 inch poster version
For the full-size shop poster, tell us where to send it.
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Text version of this sheet
TAP DRILL
TAPPED THREAD
Tap drill = nominal diameter minus pitch · millimetres
Size
Coarse pitch
Coarse tap drill
Fine pitch
Fine tap drill
M2
0.4
1.6
-
-
M2.5
0.45
2.05
-
-
M3
0.5
2.5
-
-
M4
0.7
3.3
-
-
M5
0.8
4.2
-
-
M6
1.0
5.0
0.75
5.25
M8
1.25
6.8
1.0
7.0
M10
1.5
8.5
1.25
8.8
M12
1.75
10.2
1.25
10.8
M14
2.0
12.0
1.5
12.5
M16
2.0
14.0
1.5
14.5
M18
2.5
15.5
1.5
16.5
M20
2.5
17.5
1.5
18.5
M22
2.5
19.5
1.5
20.5
M24
3.0
21.0
2.0
22.0
M30
3.5
26.5
2.0
28.0
Rule of thumb: drill = D - P gives about 75% thread. Thread-forming taps need larger drills.
The Fastener App | TheFastenerApp.com
Fastener Guide reference FG-0AAF21 · thefastenerapp.com/fastener-guide/wall-charts/metric-tap-drill-quick-reference · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
