Universal Hexagonal Allen Key Set 2.5mm to 8mm
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Prices updated: 12 Oct 2026
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About this product
A universal hexagonal (Allen) key set for tightening and loosening hex socket screws in electronics, robotics and 3D printer assembly. The listing offers several size combinations, including 2.5, 3 and 4 mm, and other variants that go up to 8 mm.
Specifications
- Drive type
- Hexagonal (Allen)
- Sizes
- 2.5 / 3 / 4 / 5 / 6 / 8 mm (varies by set)
Frequently asked questions
Which key size matches a specific screw?
Match the key to the hex socket of the screw head. For ISO socket head cap screws, M3 uses 2.5 mm, M4 uses 3 mm, M5 uses 4 mm, M6 uses 5 mm and M8 uses 6 mm. A loose fit can round the socket.
Can these keys be used on 3D printer frames and robot chassis?
Yes, as long as the screws have hex socket heads of the matching size. Use the key fully seated in the socket and turn it steadily.
