Banana plugs

Banana plugs are spring-loaded, single-wire (conductor) electrical test connectors used for joining wire to electrical equipment or electrical circuit boards. Banana connectors come in two forms, a banana plug or a banana socket. The banana plugs directly into a banana socket (often referred to as a banana jack). Popular testing equipment and test accessories such as leads and cables use a banana connection. A banana plug is considered a male connector and is called a banana because of its unique contact tip. The banana plug is a cylindrical pin that has “metal-leaves” that bulge outward to produce a strong connectivity contact (snug fit) in a socket to prevent the pin from disconnecting or falling out. Banana plugs often connect to wire that can be soldered, crimped, or screwed into place. Many banana plugs are also available as adapters, offering a plug to another connection style.