DictionaryspannerNut-and-bolt tool
noun

spanner

SPAN-er/ˈspænər/

A tool that grips nuts or bolts for turning.

The spanner grips the hexagonal nut on the metal bracket.

A steel open-ended spanner snugly gripping a hexagonal nut on a simple bolted metal bracket, with its handle extending diagonally into white space.
Etymology

From spannen, “to fasten or extend,” a spanner was originally a tool for winding a firearm’s spring. The name later came to mean a mechanical wrench.

In context

Sampson Boat Co1:24
I'm gonna need to take the mast step out to get this nut off this keelbolt. But first, I'm gonna measure it. You know I was looking for a bigger spanner?
8. Removing her Keel ( & the return of the building inspector ) - Rebuilding Tally Ho EP8

More examples

  • Choose a spanner that fits snugly around the bolt head.
  • He turns the spanner slowly to tighten the nut.
  • The mechanic keeps several sizes of spanners in a drawer.

Forms

spanner · spanners

Similar words

wrench
The usual American term for a nut-and-bolt turning tool.