Allen keys, also known as hex keys or hex wrenches, are simple yet essential tools designed for tightening or loosening screws and bolts that feature hexagonal recesses. They are characterized by their L-shaped design, which provides leverage and torque when turning fasteners.

Design and Functionality

An Allen key is typically made from a single piece of hardened steel, shaped into a hexagonal rod with blunt ends that fit snugly into the corresponding hexagonal sockets of screws. The tool's L-shape allows users to grip the longer arm for maximum torque while the shorter arm can be used for quicker turns in tight spaces. This design is particularly effective for accessing recessed screws, where traditional screwdrivers may struggle.

Historical Context

The term "Allen key" originates from the Allen Manufacturing Company, which patented the design in the early 20th century. While "Allen" is a trademarked name, it has become a generic term widely used in English-speaking countries. The tool has evolved over the years, with advancements in materials and design enhancing its durability and versatility, making it a staple in both professional and DIY toolkits.

Sizes

1 x 1.5 mm

5 x 2 mm

3 x 3.2 mm

6 x 4 mm

8 x 5 mm

3 x 5.5 mm

4 x 6.3 mm

3 x 8 mm

2 x 10 mm

1 x 12.8 mm