Spanner vs. Wrench
In the basic hand-tool sense, “spanner” is the usual UK term and “wrench” is the usual US term. “Wrench” also has verb and figurative noun senses, so the regional equivalence should not be extended beyond the tool meaning.
For the hand tool used to grip and turn nuts, bolts, or similar objects, use “spanner” in UK-oriented English and “wrench” in US-oriented English.
Key details
Choose the right form
| Audience / meaning | Preferred term | Decision |
|---|---|---|
| the general hand-tool sense in ordinary UK English | spanner | Use the usual UK term. |
| the corresponding general hand-tool sense in ordinary US English | wrench | Use the usual US term. |
| a verb or figurative noun sense of “wrench” | wrench | Do not substitute “spanner”; the regional equivalence is limited to the tool sense. |
| a specialized tool subtype | check the subtype name | Do not assume every specialized spanner and wrench label is interchangeable. |
Quick tests
Meaning / construction test
Are you naming the ordinary hand tool used to grip and turn nuts, bolts, or similar objects?
If yes: Match the term to audience: “spanner” in UK-oriented English and “wrench” in US-oriented English.
If no: Keep “wrench” where it has a separate verb/figurative sense, or check the specific technical subtype.
Caveat: The regional equivalence is general and limited to the shared hand-tool sense; specialized tool names can be more specific.
Examples
Use the correct spanner for the nut.
“Spanner” is the ordinary UK term in the shared hand-tool sense.
Use the correct wrench for the nut.
“Wrench” is the ordinary US term in the corresponding hand-tool sense.
Keep the tool vocabulary consistent with the audience throughout the manual.
The choice is regional vocabulary in the shared general tool sense, not a universal difference in function.
Further guidance
Core difference
“Spanner” is the standard UK term for the tool; “wrench” is the standard US term in the corresponding sense.
Fast Test
If you mean the hand tool, match the term to region; if “wrench” means twist/pull violently or an emotional wrench, there is no “spanner” substitution.
Usage Boundary
Different tool subtypes may have more specific names, so this regional equivalence is general rather than a claim that every specialized spanner and wrench is identical.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- spanner — Cambridge English Dictionary (opens in a new tab)Cambridge Dictionary · UK spanner tool sense and explicit US wrench equivalent
- wrench — Cambridge English Dictionary (opens in a new tab)Cambridge Dictionary · Mainly US wrench tool sense plus distinct verb and figurative noun senses