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A hex key, also known as an Allen Key, Allen wrench or hex wrench is a small L shaped or T shaped tool with a 6-sided hexagonal tip which is used to loosen hex socket screws or bolts.

### Types of Hex Key

**L-Shaped Hex Keys:** L Shaped Hex Keys or [L Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294379624) are the most common type of hex key with a hexagonal tip at each end

**T-Shaped Hex Keys:** T-shaped hex keys or [T bar Allen Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294379631) have a crossbar or T shaped handle at the end which provides a better grip

**Folding Allen Key Sets:** [Folding Allen Key Sets](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4290511960) consist of an outer casing from which a selection of different sized Allen keys can be unfolded, a bit like a penknife or multi-tool

Hex keys or Allen keys are available in metric sizes and imperial sizes [Imperial Allen Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294407154). They are also available in [Allen Key Sets](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=xyz) which include a range of popular hex key sizes including [12mm Allen keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4291389928). RS also supply Allen keys from leading brands such as [Wera Allen Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294964448), [Wera Allen Key Sets](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=xyz) and [Bondhus Allen Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294966929)

For more information please refer to our [Hex Keys Guide](https://uk.rs-online.com/web/content/discovery/ideas-and-advice/hex-keys-guide)

For our range of hex socket screws please see [Socket Screws](https://uk.rs-online.com/web/c/fasteners-fixings/screws-bolts/socket-screws/)



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