*All measurements in millimeters (mm)*
| d |
a approx. |
z approx. |
| M0.8 |
0.46 |
0.12 |
| M1 |
0.48 |
0.15 |
| M1.5 |
0.62 |
0.23 |
| M2 |
0.78 |
0.3 |
| M2.5 |
0.95 |
0.4 |
| M3 |
1.1 |
0.45 |
| M4 |
1.4 |
0.6 |
| M5 |
1.7 |
0.75 |
| M6 |
2.1 |
0.9 |
| M8 |
2.6 |
1.2 |
| M10 |
3 |
1.5 |
| M12 |
3.8 |
1.8 |
| M14 |
3.8 |
2 |
| M16 |
4.7 |
2.5 |
| M20 |
6 |
3 |
ISO-Tolerances for Metric Fasteners
| Nomimal Dimension |
Tolerance Zone in mm (external measurements) |
| Over |
To |
h6 |
h8 |
m6 |
| 0 |
1 |
0 |
-0.006 |
0 |
-0.014 |
+0.002 |
+0.008 |
| 1 |
3 |
0 |
-0.006 |
0 |
-0.014 |
+0.002 |
+0.008 |
| 3 |
6 |
0 |
-0.008 |
0 |
-0.018 |
+0.004 |
+0.012 |
| 6 |
10 |
0 |
-0.009 |
0 |
-0.022 |
+0.006 |
+0.015 |
| 10 |
18 |
0 |
-0.011 |
0 |
-0.027 |
+0.007 |
+0.018 |
| 18 |
30 |
0 |
-0.030 |
0 |
-0.033 |
+0.008 |
+0.021 |
*All information is strictly informative |
