Allen Keys (Hex Keys)

Allen keys, also known as hex keys, are essential tools for any tradesperson. Whether you’re assembling equipment, installing fittings or working on machinery, Allen keys are often your go-to fastening tool.

Allen keys: An essential part of any toolkit

An Allen key, professionally known as a hex key or hex wrench, is an essential fastening tool that many tradespeople rely on daily. This specialised hand tool is purpose-built to tighten or loosen hexagonal socket screws and bolts, common in construction, mechanical assembly and maintenance work. Its precision-shaped hexagonal shaft allows it to engage securely with fasteners, ensuring maximum torque with minimal slipping. Most Allen keys feature a distinctive L-shape, designed specifically to maximise usability and efficiency. The short arm provides exceptional torque, helping you tackle stubborn fixings without risk of damaging the tool or the fastener. The longer arm is ideal when you need to quickly spin bolts or reach fittings that are recessed or in awkward spots. Additionally, professional-grade Allen keys often feature ball-end tips. These innovative tips allow you to insert and operate the tool at angles up to 25 degrees. The design makes the Allen key ideal for tight, confined or difficult-to-reach spaces frequently encountered on the job At ITS, we stock an extensive range of Allen keys and Allen key sets suitable for professional construction workers and tradespeople. Our collection includes everything from single replacement keys to comprehensive sets with up to 30 pieces, so you’ll always have the size you need. We supply trusted, professional-quality brands like Vaunt, Milwaukee, Dewalt and Wera, Sealey and WORKPRO—brands you can always rely on to get the job done..

Types of Allen keys available at ITS

Choosing the right Allen key depends on your specific job requirements, and at ITS, we stock a wide selection to match every professional need.

Individual Allen keys

If you have a specific or occasional need, purchasing an individual Allen key is an efficient way to replace lost or damaged tools without buying an entire set. Ideal for specialised tasks or when you require uncommon sizes, individual Allen/hex keys ensure you always have exactly the right tool on hand.

Allen key sets

Allen key sets are practical and cost-effective for professionals who encounter varied tasks regularly and need multiple keys at hand. At ITS, we offer comprehensive sets ranging from compact 8-piece and 9-piece collections to extensive kits featuring up to 30 keys, covering every common size you'll need on-site. Having a full set eliminates downtime spent searching for the correct size, letting you get the job done efficiently.

Colour-coded Allen key sets

For fast-paced working environments, colour-coded Allen key sets are invaluable. Each size is clearly marked with a distinct colour, allowing quick identification and selection. This feature is particularly beneficial when working at height or in conditions where visibility or speed matters, reducing mistakes and improving safety.

Fold-out Allen key sets

Fold-out Allen keys are designed with portability and convenience in mind. Their compact, foldable design ensures all keys stay secure, preventing loss and clutter. Professionals working across multiple locations or mobile workstations prefer fold-out sets for their ease of storage and immediate accessibility. The ergonomic handle doubles as storage, providing a comfortable grip for extra leverage when needed.

Choosing the right tip: Flat-end, ball-end and Torx

The tip of your Allen key can make all the difference on-site, especially when space is tight or torque matters. Some of the most common tips you’ll come across include:

Flat-end Allen keys

Flat-end tips are the go-to for applying high torque. They seat fully inside the fastener head, providing maximum contact and grip. If you're working with tight bolts or need to apply serious turning force (like when fitting metal brackets, assembling heavy-duty kits or working with industrial machinery) this is your safest, most stable option. They're also less likely to strip fastener heads, which saves you time and hassle on rework.

Ball-end Allen keys

Ball-end tips are designed for access, not brute force. They allow you to work at angles, usually up to 25 degrees. That’s a game-changer when you’re reaching behind panels, under units or into tight service spaces. You won’t get the same torque, but they’re ideal for starting threads or finishing in awkward spots.

Torx keys

Torx or star-shaped tips aren’t technically Allen keys, but they show up in many modern tool sets for good reason. You’ll come across these more often in automotive, electrical and appliance work. They offer better grip than standard hex keys and are less prone to cam-out, especially under load. Torx tips are essential if you’re working on high-precision components where repeated access is needed without wearing out the fastener or tool.

Choosing an Allen key with the right type of tip can mean the difference between a job that flows smoothly and one that fights you every step of the way. Luckily, you can find many editions of Allen keys that include both a flat-end and ball-end tip in each end, giving you added flexibility in their usage.

Order your Allen key online at ITS.co.uk

With over 45 years of experience serving professionals, we understand the demands of trade work and the importance of having the right tool at the right time. We carefully handpick every Allen key and set in our range to ensure you get the best. Whether it’s a single key or a comprehensive set, we stock a large variety of top-quality tools from the most popular brands among professionals. If you have any questions about our products, our team of experts is here to help - contact us here. Need your tools fast? We offer next-day delivery on thousands of products, including our entire range of Allen keys, so you’re never left waiting when there’s work to do.

Common questions about Allen keys (hex keys)