What is a cable lug?

Cable lugs are devices used to connect cables to electrical appliances, other cables, surfaces, or mechanisms. A common example of a cable lug is the clamp that connects wires to an automotive battery, as well as the ends of battery jumper cables. These lugs are designed to be easily installed and removed for repairs or maintenance, especially when permanent, direct-fastening methods are not feasible or necessary.

(For clarification, a cable is made up of multiple wires stranded together, while a single wire has only one conductor.)  It's important to note that the terms "cable" and "wire" are sometimes used interchangeably.

Both cables and wires can be used with cable lugs of a suitable type. One end of a cable lug is typically used for connecting a cable, which can be soldered, welded, or crimped, depending on the type. The connected end of the lug is then fastened to a matching terminal or connection point using a bolt, screw, or spring clip. There are numerous sizes, configurations, and material types available to suit particular applications, but metal is the predominant material used. Depending on industry jargon and application, a cable lug may also be referred to as a "cable connector" or "cable anchor."

The connector end of a cable lug is chosen based on its compatibility with the terminal type or anchoring method. For example, fork or U-shaped lugs are used for screw terminals, closed-ring or O-type lugs are used for bolt-on applications, and pin or spade lugs are used for press-on pin or blade terminals. Additionally, a cable lug can serve as a cable-size reducer, allowing thick cables to be attached to a connector with a smaller diameter.