box spanner

British

noun

a spanner consisting of a steel cylinder with a hexagonal end that fits over a nut: used esp to turn nuts in positions that are recessed or difficult of access

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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To facilitate the quick closing of the doors, plates were affixed in suitable positions on the sides of the alleyways, indicating the positions of the deck plates, and a box spanner was provided for each door, hanging in suitable clips alongside the deck plate.

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023