Here's a breakdown:
* Shape: The most common shape is an L, but they also come in T-shapes and other variations.
* Material: Usually made from steel, but sometimes stainless steel or other materials.
* Function: Used to turn screws with hexagonal sockets (recesses in the screw head). These sockets have six sides.
* Sizes: Measured in millimeters (mm), with sizes ranging from 1.5mm to 10mm.
Why are they called Allen keys?
The Allen Manufacturing Company in Hartford, Connecticut, patented the hexagonal socket screw and wrench in the early 20th century. The term "Allen wrench" is a registered trademark of Allen Manufacturing, but the terms "hex key" and "Allen key" are often used interchangeably.
Uses:
Allen keys are widely used in various industries, including:
* Furniture assembly: Commonly used in IKEA furniture and other pre-assembled items.
* Bikes: Used to adjust and tighten components like handlebars, seats, and brakes.
* Electronics: Found in many electronic devices, including computers and appliances.
* Automotive: Used for various tasks, such as tightening lug nuts and securing engine components.
* Machinery: Used in industrial machinery and equipment for various applications.
Advantages:
* Stronger grip: The hexagonal shape provides a stronger grip on the screw, reducing the chances of stripping the screw head.
* Compact size: They're small and easy to carry, making them convenient for various tasks.
* Versatility: They're used in many different applications, making them a valuable tool to have.
Disadvantages:
* Limited availability: Some specific sizes may be harder to find compared to standard screwdrivers.
* Difficulty in accessing tight spots: The L-shape can make it difficult to access screws in tight spaces.