Allen key

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