AN-Fittings in cars

10 October, 2019 0 By mildy33

When building a car for use in car racing, drag racing or drifting, you’re not allowed to use normal types of hose fittings. This is because of the risk that regular hose fittings might break under the high pressure achieved in race car fuel systems. An AN fitting gets your fuel and fluids where they need to go, safely.

The term “AN” in AN-Fitting comes from the US Army and is Army Navi in short. AN-fittings were invented by the US Army as they needed a reliable fitting that could be used by both the Navy as well as the Army. Because they are easy to install, reliable and sturdy, the AN-fittings became popular and something of a necessity in motorsports. The fittings were originally compliant with the specification MIL-F-5509 but are now controlled under SAE ASS (Aerospace Standards) specifications AS4841. This guarantees the high quality of the fittings.

The different sizes of an AN-Fitting

There’s a number of sizes that are standard when it comes to AN-fittings for use in cars. The sizes range from AN4-20, usually in the steps of 4, 6, 8, 10, 12, 16 and 20. The number before AN stands for parts of 1/16 of an inch. For example, the AN8 fitting is 8 x 1/16= 8/16 or 1/2 inch or if converted to millimeters 12,7 mm.

The advantages of using AN-Fittings

Due to the configuration of the fitting where the hose gets clamped together with the fitting via a steel bracket, the couplings hold their connection even when exposed to extreme pressures. The screwable connections between different AN-fittings make it easy to customize ur fuel or fluid lines without needing to cut and extend hoses. When racing your car, the fuel and fluid lines (water for the cooler, oil etc.) become a vital part of the reliability of the car itself. As the consequences of a broken hose might be the breaking of ur engine.