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An Allen wrench, also known as a hex key or Allen key, is a tool used to drive bolts and screws with hexagonal sockets (recesses) in their heads.
- Shape and Design: Allen wrenches are typically L-shaped, although they can also come in straight versions or as T-handles. The L-shaped design provides leverage and allows for easy rotation when fastening or loosening bolts.
- Hexagonal Socket: At one or both ends, Allen wrenches have a hexagonal (six-sided) shape that matches the hexagonal socket of bolts or screws designed for them. This socket provides a precise fit and helps prevent stripping or damaging the fastener.
- Materials: Allen wrenches are commonly made from hardened steel or other metals to withstand high torque loads without bending or breaking. They may also have a coating or finish to improve grip and prevent corrosion.
- Sizes: Allen wrenches come in a variety of sizes, typically ranging from very small (e.g., 0.7 mm) to larger sizes (e.g., 19 mm or more). The size is determined by the width across the flats of the hexagonal socket.
- Applications: Allen wrenches are widely used in automotive, furniture assembly, bicycle maintenance, and machinery repair. They are especially common in applications where space is limited and a traditional socket wrench or screwdriver cannot fit.
- Advantages: The main advantages of Allen wrenches include:
- Precise fit and engagement with hexagonal fasteners.
- Ability to apply high torque without slipping.
- Compact size and versatility for use in various applications.
- Availability in metric and imperial (SAE) sizes to accommodate different fastener standards.
- Other Names: Allen wrenches are also referred to as hex keys or hex wrenches, reflecting their hexagonal shape and primary function.
Allen wrenches are essential tools for fastening and loosening bolts and screws with hexagonal sockets, offering efficiency, precision, and versatility across a wide range of mechanical and assembly tasks.
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