ACE is a three-letter acronym for the American chain of hardware stores, ACE Hardware. Founded in 1924, ACE Hardware is the largest retailer-owned hardware cooperative in the world, with over 5, 000 stores across the United States and 70 countries. ACE Hardware offers a wide variety of products, from home improvement supplies to lawn and garden equipment. The company also provides services such as key cutting, paint mixing, and small engine repair.