Allen wrench

Allen, the name of Allen Manufacturing Company, and wrench.

Allen wrench (plural Allen wrenches)

2. Synonym of hex head wrench.

• Allen bolt
• Allen key
• Allen screw

• “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.