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We are often asked what size hex Allen key wrench will fit a certain socket screw. Below is a conversion chart to help:
Metric Socket Cap Screws
| Thread Diameter Size | Allen Key Wrench Size |
|---|---|
M2 |
1.5 |
M2.5 |
2.0 |
M3 |
2.5 |
M4 |
3.0 |
M5 |
4.0 |
M6 |
5.0 |
M8 |
6.0 |
M10 |
8.0 |
M12 |
10.0 |
M14 |
12.0 |
M16 |
14.0 |
M20 |
17.0 |
M24 |
19.0 |
M30 |
22.0 |
M36 |
27.0 |
M42 |
32.0 |
M48 |
36.0 |
M56 |
41.0 |
M64 |
46.0 |
Metric Socket Set (Grub) Screws
| Thread Diameter Size | Allen Key Wrench Size |
|---|---|
M2 |
0.9 |
M2.5 |
1.3 |
M3 |
1.5 |
M4 |
2.0 |
M5 |
2.5 |
M6 |
3.0 |
M8 |
4.0 |
M10 |
5.0 |
M12 |
6.0 |
M14 |
6.0 |
M16 |
8.0 |
M20 |
10.0 |
M24 |
12.0 |
M27 |
14.0 |
M30 |
14.0 |
M36 |
17.0 |
Metric Socket Button Screws
| Thread Diameter Size | Allen Key Wrench Size |
|---|---|
M3 |
2.0 |
M4 |
2.5 |
M5 |
3.0 |
M6 |
4.0 |
M8 |
5.0 |
M10 |
6.0 |
M12 |
8.0 |
M14 |
8.0 |
M16 |
10.0 |
M20 |
12.0 |
M24 |
14.0 |
Metric Socket Button Screws
| Thread Diameter Size | Allen Key Wrench Size |
|---|---|
M3 |
2.0 |
M4 |
2.5 |
M5 |
3.0 |
M6 |
4.0 |
M8 |
5.0 |
M10 |
6.0 |
M12 |
8.0 |
M14 |
8.0 |
M16 |
10.0 |
M20 |
12.0 |
M24 |
14.0 |
