What do you know about the hex key

It may be one of the simplest tools in your toolbox, but the hex key has a surprisingly interesting history. From factory safety to bicycles, furniture, cars, and even military equipment, this tiny L-shaped piece of steel became a worldwide standard.

• A Six-Sided Fit – A hex key has six contact surfaces that fit tightly into a matching hexagonal socket, allowing it to turn screws without needing a traditional external wrench.
• The Famous L-Shape – Most hex keys are made from a single piece of hard hexagonal steel rod bent into a 90° L-shape. The long arm gives you leverage, while the short arm is useful in tight spaces.
• Allen Is A Brand – “Allen key” sounds like the generic name of the tool, but Allen actually originated as a trademark of the Allen Manufacturing Company around 1910.
• Born Around 1910 – Hex socket screws were probably not manufactured until around 1910, although the basic idea of internal socket drives had been considered decades earlier.
• Safety Started It – One reason hex socket screws became attractive was workplace safety. Headless set screws were less likely to catch workers' clothing on rapidly rotating machinery.
• Two Ways To Twist – Use the long arm and you get more torque; use the short arm and you gain speed and access to awkward spaces. The same tiny tool can therefore behave quite differently depending on how you hold it.
• Tiny But Powerful – Hex keys can work with very small screw heads while remaining extremely simple, cheap, light, and easy to manufacture. That is one reason they are so often included with furniture and other products that require assembly.
• The WWII Connection – World War II's enormous expansion of industrial manufacturing helped bring hex socket drives into contact with ordinary people. After the war, their use continued spreading into everyday products.
• A Worldwide Tool – Different countries gave the same basic tool different names. In Germany it became known as INBUS, while in Italy it is commonly called brugola.
• You Can Repair It – A worn hex key does not necessarily need to be thrown away. The damaged end can be ground off, allowing the tool to be used again.

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