hook spanner
Definition
Noun: A hook spanner is a type of wrench designed with a hook-shaped end. This hook is specifically engineered to fit over and engage with the notches or holes on the periphery of a nut or bolt head, allowing the user to apply torque for tightening or loosening.
Usage
A hook spanner is used to turn specialized fasteners, such as slotted nuts, ring nuts, or castellated nuts, which have notches or holes cut into their outer edges instead of flat sides. It is a common tool in mechanical and plumbing applications.
Examples
- The plumber used a hook spanner to adjust the large retaining ring on the pipe fitting.
- To remove the bearing locknut, you will need the correct size of hook spanner to fit its slots.
- The mechanic reached for his set of hook spanners to service the spindle assembly.
Advanced Usage
- Hook spanner wrenches are often sold in sets to accommodate different nut diameters and slot patterns.
- The effectiveness of a hook spanner depends on the precise fit of its hook into the fastener's notch; an ill-fitting hook can slip and damage the tool or the fastener.
Variants and Related Words
- Hook wrench: A common synonym for hook spanner.
- Pin spanner: A similar tool that uses pins instead of a hook to engage holes in a fastener. This is a distinct but related type of wrench.
- C-spanner (chiefly British English): Another term for a hook spanner, referring to its C-shaped profile.
Synonyms
- Hook wrench
- C-wrench
- C-spanner (UK)
Antonyms
- Open-end wrench: A wrench with fixed, parallel jaws for gripping the flat sides of a hex nut or bolt.
- Box-end wrench: A wrench with a enclosed ring that fits over the points of a hex nut or bolt.
Noun
-
a wrench with a hook that fits over a nut or bolt head
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