Definition

Noun: A hand tool, typically L-shaped, with a hexagonal cross-section at one or both ends, designed to drive screws or bolts that have a matching hexagonal socket in their head.

Usage

An Allen wrench is used to tighten or loosen fasteners with an internal hexagonal drive, commonly known as Allen screws or socket head cap screws. It is a simple, durable tool often included with furniture or machinery for assembly.

Examples

• Noun:
  • You will need an Allen wrench to assemble the bookshelf.
  • The mechanic selected the correct size Allen wrench from the set.
  • I can't find the small Allen wrench that came with the bicycle.

Advanced Usage

• "Allen key": A common synonym, especially in British English.
  • The instructions specify that an Allen key is required for this step.
• "Hex key": A generic term for the tool, referring to its hexagonal shape.
  • A set of hex keys is essential for any basic toolkit.

Variants and Related Words

• Allen screw (n): The type of fastener designed to be used with an Allen wrench.
  • The frame is secured with several Allen screws.
• Hex wrench (n): Another term for Allen wrench, emphasizing the hexagonal shape.

Synonyms

• Hex key
• Allen key
• Hex wrench
• Socket wrench (Note: This is a broader category; a standard socket wrench uses external sockets, while an Allen wrench is a single, solid tool for internal sockets.)

Related Phrases

• Set of Allen wrenches: A collection of wrenches of various sizes, often held together on a ring or in a foldable holder.
  • He bought a complete set of Allen wrenches for his workshop.

Noun

1. a wrench for Allen screws