Universal Hexagonal Allen Key Hand Tool, Metric 3mm 4mm 5mm
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Prices updated: 13 Oct 2026
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About this product
A universal hexagonal (Allen) wrench hand tool for turning socket-head screws and hex-socket fasteners in metric sizes. The listing offers several size sets, and this one covers 3 mm, 4 mm and 5 mm. Useful for assembling robots, 3D printers, enclosures and electronics projects.
Specifications
- Type
- Hexagonal (Allen) key
- Sizes in this set
- 3 mm, 4 mm, 5 mm
- Unit system
- Metric
- Other size sets offered
- 2.5-3-4 mm, 3-4-5 mm, 4-5-6 mm, 5-6-8 mm
Frequently asked questions
Which size do I need for my screws?
The hex key size is the width across the flats of the socket. 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.
Which sizes are included?
The title specifies 3 mm, 4 mm and 5 mm. The listing also shows other set options, so confirm the sizes of the selected variant.
