Definition

Noun: A hand tool, specifically a wrench, characterized by having a fixed, U-shaped opening (jaws) at one or both ends of its handle. The jaws are parallel and set at a fixed width, designed to grip two opposite sides of a fastener, such as a nut or bolt head.

Usage

An open-end wrench is used for tightening or loosening nuts and bolts. It is applied by fitting the U-shaped opening over the fastener and turning the handle. The fixed size means a user typically needs a set of wrenches for different fastener sizes. - It is a common tool in mechanical work, automotive repair, and general maintenance. - The design allows for quick engagement with a fastener, often where there is sufficient clearance to slip the wrench on and off.

Examples

Advanced Usage

• Dual-end design: Many open-end wrenches have a different sized opening on each end of the handle, effectively providing two tools in one.
  • This wrench has a 10mm open-end on one side and a 12mm on the other.

Variants and Related Words

• Wrench (spanner): The general category of hand tools used for turning fasteners.
• Box-end wrench: A wrench with a closed loop that fully encircles a fastener, often offering more grip and less likelihood of slipping.
• Combination wrench: A single tool that has an open-end on one end of the handle and a box-end on the other.
• Adjustable wrench (Crescent wrench®): A wrench with one movable jaw, allowing it to fit a range of fastener sizes, unlike the fixed-size open-end wrench.

Synonyms

• Spanner (primarily British English): The general term for a wrench.
• Open-ended spanner: The direct British English equivalent for "open-end wrench."

Notes on Meaning

The term specifically refers to the fixed-jaw, open-sided design. It is distinct from adjustable wrenches or socket wrenches. The "open-end" describes the fact that the gripping end is not a closed circle.

Noun

1. a wrench having parallel jaws at fixed separation (often on both ends of the handle)