spanner
noun
°A hand tool for adjusting nuts and bolts.
"Pass me that spanner, Jake; there's just one more nut to screw in."
°A hand tool shaped like a small crank handle, for winding the spring of a wheel lock on a musket.
"1786, Fig. 10. The spanner for spanning or winding up the spring of the wheel lock. — Francis Grose, A Treatise on Ancient Armour and Weapons, page xvi."
synonyms: wrench