How to Calculate Thread Length on a Bolt
At Arun Fasteners we are often asked about the thread length on differing size Hex Head Bolts. Below is a helpful guide. NOTE: It is
We are often asked what size hex Allen key wrench will fit a certain socket screw. Below is a conversion chart to help:
| 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 |
| 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 |
| 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 |
| 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 |
At Arun Fasteners we are often asked about the thread length on differing size Hex Head Bolts. Below is a helpful guide. NOTE: It is
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