Allen wrench

== English == === Etymology === Allen, the name of Allen Manufacturing Company, and wrench. === Noun === Allen wrench (plural Allen wrenches) Synonym of hex head wrench. ==== Related terms ==== Allen bolt Allen key Allen screw ==== Translations ==== === Further reading === “Allen wrench”, in Collins English Dictionary. “Allen wrench”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present. “Allen wrench”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022. “Allen wrench”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.