an lines

The AN thread (also A-N) is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a US military-derived specification that dates back to World War II and stems from a joint standard agreed upon by the Army and Navy, hence AN.

What does an stand for in fittings?

Historical Context of the AN Fitting

AN stands for Air Force – Navy Aeronautical Design Standards (also known as “Army Navy”) that are used in U.S. Military aviation applications. These fittings are made to meet strict performance standards related to the aeronautical industry.

Where are AN fittings used?

AN fittings and hoses are often found installed on high performance and race cars.

The most common uses of AN hoses on race cars:
-3 AN fittings used for brake lines.-4 AN fuel hoses.-6 AN fuel or coolant hoses.-8 AN a very common size for coolant and oil.-10, -12 AN fittings are used on either coolant or vent hoses.

Why are AN fittings red and blue?

Traditionally, AN Fittings are produced in a red/blue color combination, which served as a nod to the origin in army and navy applications for many years.

What’s the difference between JIC and AN fittings?

The only difference between AN and JIC fittings is that AN fittings are manufactured as per more stringent tolerances for military applications.

What is 6AN hose?

The AN numbers refer to the tubing OD in sixteenths of an inch. For example, 8AN hose has the same ID as a 1/2″ nominal tube (8/16 = 1/2). 3AN hose has the same ID as a 3/16″ tube. This means that 6AN hose will not introduce any appreciable flow restriction in a fuel system designed around 3/8″ OD rigid tubing.

Why do some AN fittings have O rings?

Port fittings and adapter fittings using straight thread require use of an O-ring boss seal technique to seal against leakage.

What degree are AN fittings?

The U.S. Air Force, with help from Wright Patterson Air Force base, developed a fitting with 37° flare angle, before WWII, which became known as the “AN” fitting.

What is NPT fitting?

NPT (or National Pipe Taper) is a U.S. standard for tapered threads widely used on pipes and fittings for over 100 years. NPT connections rely on thread deformation- a metal to metal sealing design where the threads of the connectors themselves form together.

What is UNF and UNC thread?

There are two main kinds of threads in the Unified Screw Thread (UST) Standard—UNF and UNC. UNF is the designation for Unified Fine Threads. Meanwhile, UNC denotes Unified Coarse Threads. UNC threads are a type of coarse thread that has an unbroken series of right-hand turns with uniform geometry.

What is SAE thread?

What is SAE thread? SAE stands for the Society of Automotive Engineers. SAE fittings are mostly used in refrigeration, automotive piping systems and other low-pressure applications. It’s common for copper tubes to be used with SAE threads. SAE Flare (SAE J512)