Which Allen Key should I use for the Socket Screw I am using?

 

 

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

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UNIT 2-3 FORD LANE INDUSTRIAL ESTATE
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