AN stands for "Army-Navy" or "Aircraft Number" and is a designation system originally developed to identify standardized components used in military and aerospace applications, including wire sizes.
The AN designation system was created by the U.S. Army and Navy to streamline and unify part identification across multiple military branches. Within wire and cabling applications, “AN” is often followed by a numerical value (e.g., AN-6), which corresponds to the American Wire Gauge (AWG) size of the conductor. For example, AN-6 identifies a wire with a conductor size equivalent to 6 AWG.
Although initially developed for military and aviation use, some AN designations and component standards have been referenced in broader industrial and commercial environments. In cabling, the term may appear in documentation, labeling, or legacy systems when referencing specifications or compliance based on military-grade wiring.
While not commonly used in modern commercial building projects, understanding AN classifications can be relevant when working with legacy systems, government contracts, or specifications calling for military-grade components. The system emphasizes uniformity, ruggedness, and reliability, often indicating wires and components suited for extreme conditions or critical infrastructure.
The AN system was developed during the early 20th century as a collaborative effort between the U.S. Army and Navy to standardize part numbers for aviation and defense components. It simplified logistics and maintenance across branches and laid the foundation for many modern military specifications (MIL-SPECs). Over time, elements of the system have been adopted into civilian manufacturing and documentation standards, especially for high-performance applications.