What Is An An Fitting

April 21, 2024 Post a Comment

What is an an fitting

AN stands for Army-Navy. AN fittings are a particular type of fitting used to connect flexible hoses and fluid-carrying metal tubing together. The name is derived from a standardized joint agreement between the Army and Navy during World War II regarding the size specification of the fitting.

How does an AN fitting work?

AN fittings feature a special 37 degree flare to create a metal to metal seal when they are connected, and are NOT the same as flare fittings you find at the hardware store. Those fittings have a 45 degree flare and WILL NOT WORK WITH AN! Don't use hardware store parts to plumb your next project!

ARE AN and NPT the same?

Aside from thread sizes, the most important difference between AN and NPT threaded fasteners is that NPT uses a tapered thread. That's a fancy way of saying the bolt is actually slightly smaller at the tip than the base. It's designed that way to firmly seat the male and female threaded ends together.

What thread is a an fitting?

AN fittings have straight thread, and use O-ring seals. The O-ring size is typically defined by the “AS” standard. Dash numbers are typically assigned based on the size. Boss-seal style O-rings are typically in the 900 series.

How big is a 6AN fitting?

Male Thread Size	AN Size*	Hose ID**
7/16-20	4AN	0.22"
9/16-18	6AN	0.34"
3/4-16	8AN	0.44"
7/8-14	10AN	0.56"

What size is a 6AN fitting?

Product detailsProduct details. Size: AN6 to 3/8 NPT,the thread size of 6AN is 9/16-18UNF.

ARE AN fittings reliable?

People use AN fittings because they look cool and provide a secure fitting that seals hoses better than traditional push on nipples and hose clamps. They form a serviceable connection that provides a reliable seal.

Can you use regular AN fittings on PTFE hose?

PTFE hose is too stiff for hose clamps. It won't “crush” onto a fitting to create a good seal, like a conventional clamp. So, unique aluminum AN fittings (developed by TechAFX) must be used to secure the new hoses.

ARE AN fittings reusable?

This Ferrule is what compresses within the fitting and creates the seal and prevents leaks. Note: That while these fittings are reusable the Ferrule is not, once the fitting has been tightened and the ferrule compressed you must use a new ferrule if you reinstall the fitting.

Can I use NPT on an fittings?

In a fuel system using AN Fittings, it is very common to use an “NPT” (Nation Pipe Thread) in conjunction with the AN fittings. These NPT threads DO require the use of a tape to create the seal, where the AN fitting do NOT. When using an NPT fitting, it is common for you to only get a few turns out of the fitting.

Why are an fittings better?

“People use AN fittings because they look cool and provide a secure fitting that seals hoses better than traditional push-on nipples and hose clamps,” explains Kanga Motorsports. “They form a serviceable connection that provides a reliable seal.”

Are SAE and NPT interchangeable?

What's the difference between SAE & NPT threads? The biggest difference is SAE is a straight thread, it needs additional O-ring, gasket or sealing surface to form a seal; NPT thread is a taper thread, it can form a seal using its thread pitch.

Why do some AN fittings have O rings?

When two parts of a fitting are joined, the O‑ring is compressed to create a tight, leak proof seal. While simple in design, O‑rings are a critical component in a variety of pressure systems found in industrial, agricultural, and automotive applications.

How does an AN fitting seal?

So how these fittings seal is actually by wedging. Themselves in there as you screw them down there

Why are AN fittings red and blue?

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. The Army-Navy involvement is also the origin of the red/blue color combination that was traditionally used in the anodized finishing process.

How do you tell what size a an fitting is?

As mentioned earlier, you can always identify AN fittings based on the male thread size (outside diameter). These sizes are constant regardless of brand, hose type, or fitting configuration. If your fitting has a convex 37 degree flare at the end, the threads will tell you the AN size (and vice-versa).

How big is 6AN hose?

Male Thread Size	AN Size*	Hose ID**
3/8-24	3AN	0.13″ **
7/16-20	4AN	0.22″
9/16-18	6AN	0.34″
3/4-16	8AN	0.44″

Is hose measured by ID or OD?

Hoses are measured by inside diameter, unlike tubes which are measured by outside diameter. As a matter of fact, that is how the hoses and tubes are differentiated.