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 |
