Metric Coarse / Fine Thread Reference
Printable shop wall chart: Metric Coarse / Fine Thread 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 |
All values in mm. M10 alone means coarse (M10 x 1.5); a fine pitch must always be written. Tap drill = D - P is a rule of thumb for about 75% thread (some shops use 6.7 mm for M8 x 1.25).
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
METRIC COARSE M10 x 1.5
METRIC FINE M10 x 1.25
ISO metric threads · pitch and tap drill (drill = diameter - pitch)
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
All values in mm. M10 alone means coarse (M10 x 1.5); a fine pitch must always be written. Tap drill = D - P is a rule of thumb for about 75% thread (some shops use 6.7 mm for M8 x 1.25).
The Fastener App | TheFastenerApp.com
Fastener Guide reference FG-67115A · thefastenerapp.com/fastener-guide/wall-charts/metric-coarse-fine-thread-reference · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
