What is the difference between AN and JIC?

[JBonpua]

Does anyone know? Also, is there a gauge available to tell what size An or JIC you have? Any help is appreciated.

 

[Garlic]

1/16" that is the size gauge that tells you what you have:

IE:

1/4" = #4 (4 - 1/16th's)

3/8" = #6 (6 - 1/16th's)

#8 = 1/2" (8 - 1/16th's)

#24 = 1 1/2" (24 - 1/16th's)

And so on...

These sizing methods are used in hoses and most fitting measurements.

 

[jwgary]

Here is a link to a page that shows the threads on those fittings. Just use some calipers on the outside of the threads to see what the major diameter is and that will tell you what the fitting is.
North American Coupling Types

 

[JBonpua]

What about the difference between AN vs JIC? In the military aerospace world we use AN but from looking at it, it looks very similar to JIC. Maybe the flare is different?

 

[MZupkow]

I don't know if this will help, but AN is usually used in aircraft-type fittings. JIC is more industrial hydraulic fittings. I believe that JIC uses a 37 degree (or 37. 5 degree, I can't remember which) flare, SAE used 45 degree, but I'm not sure what AN uses. I've also noticed that a lot of AN fittings are aluminum (Usually hardened), where JIC & SAE use steel & stainless steel.



I used to work for an auto parts store that made up hydraulic hoses & A/C lines. Although the JIC fittings were strong & serviceable, the anodized AN fitting were requested more because they were better looking. I often wondered if the close proximity of the Air Force base had anything to do with it.



I know that with all of the variables, including metric, that it kept getting more & more difficult to stock enough fittings to service the customers.

 

[nickleinonen]

AN stuff is speed shop stuff...

JIC is industrial stuff. .

they both share the 37° flare and 99% of them are completely interchangeable. given the choice, i'll go with JIC as i know it is rated for pressure [hydraulic systems] and they are cheaper to buy because they don't have the fancy names on them [earls, russell... ] and they are usually just steel or cad plated steel

i don't think you'll find the speedshop blue/red "an" fittings on any aircraft. .

oh, and there are a few sizes of SAE and JIC which are almost interchangeable, and they make interchangeable female fittings for those sizes [1/2"-20, 3/4"-16 & 7/8"-14 thread pitch]

 

[MZupkow]

i don't think you'll find the speedshop blue/red "an" fittings on any aircraft. .

Obviously you haven't met any people that are nuts for old planes. :-laf

 

[tgordon]

You can also take a JIC and cut the taper off it, slip an o-ring on it for an emergency fix, had to do that one once or twice at the dealership When a farmer is in a rush he doesn't care as long as you get him back into the field.

 

[nickleinonen]

i have seen jic fittings which had a groove cut in them to accept an o ring to assist in sealing [i believe champion use that in some of their road graders]. . then the industry got smart and made the orfs fittings... best for sealing and serviceability

 

[jwgary]

From what I understand AN and JIC are the same thing as 37 deg. flare. There might be minor differences like NPT vs. NPTF. Like tgordon said you can cut the flare off (or not) and use an o-ring. That is an SAE o-ring fitting with the same threads as a JIC, but the female has a countersunk entrance for sealing the o-ring. JIC fittings are used everywhere in industrial hydraulics.

 

[Scrappy]

the aircraft I work on (a fighter) uses blue anodized AN fittings for some systems. just not hydraulic systems.

 

[tgordon]

i have seen jic fittings which had a groove cut in them to accept an o ring to assist in sealing [i believe champion use that in some of their road graders]. . then the industry got smart and made the orfs fittings... best for sealing and serviceability

If you are talking about the ones that have the o-ring on the taper Deere has started using them on some of their equipment, what a PITA. they are fine until you get the slightest knick in the oring and then you are SOL. I would rather have flat face, o-ring, NPT, or one of the umpteen other ones they have.

 

[JBonpua]

1/16" that is the size gauge that tells you what you have:

IE:

1/4" = #4 (4 - 1/16th's)

3/8" = #6 (6 - 1/16th's)

#8 = 1/2" (8 - 1/16th's)

#24 = 1 1/2" (24 - 1/16th's)

And so on...

These sizing methods are used in hoses and most fitting measurements.

Garlic,

So with a caliper I can measure the outside thread of a male AN/ JIC and if it measures ¼” it is a #4 3/8” would be a #6 and so on? Do I measure the land or the groove of the thread? Is there a jig available where I just slip it on there and it would tell me what I have?

 

[Garlic]

Not really> The size number refers to the hose/tube ID of what the fitting is being mated to it. http://hydraulics.eaton.com/products/pdfs/fc/e-srov-ts009-e.pdf

go here to see and get all of the information about fitting measurements and sizing. It is the Aero Quip fitting reference. Hope this helps. I assemble about 20 miles of hydraulic hoses in my place of employment every year so I take some of this for granted.

 

[cruiser_2]

AN fittings are a military specification used mainly in aerospace fittings. The specifications were jointly agreed to by both the Air Force and Navy (hence the AN) It is a metal on metal flare fitting that utilizes a 37 degree flare. The industrial equilivant is a JIC fitting but are not held to the same inspection and certification requirements required for Aerospace applications.



Blue anodized fittings are aluminum, black fittings are Steel or Stainless steel for extreme pressures above 3000 psi, brass is a brassy colour.



I am an aircraft mechanic and the colours have a definate meaning. The fittings supplied by the speed shops are AN in appearance only (the red anodized parts of the fitting is mainly for colour contrast) and lack the certificaion necessary for use on an aircraft. Even though they may have come from the same lot as the Truly AN certificated fittings they are not trylu an AN fitting only an AN style fitting.

 

[obert]

You can also take a JIC and cut the taper off it, slip an o-ring on it for an emergency fix, had to do that one once or twice at the dealership When a farmer is in a rush he doesn't care as long as you get him back into the field.

JIC thread is common (or "close enough" :-laf ) to straight o-ring fittings. Those emergency repairs might well have been permanent, eh?

i have seen jic fittings which had a groove cut in them to accept an o ring to assist in sealing [i believe champion use that in some of their road graders]. . then the industry got smart and made the orfs fittings... best for sealing and serviceability

I agree with tgordon. If ever I open a JIC with o ring, and often do, I remove the o-ring and throw it away. The o-ring was put there with good intentions, but we all know about that road paved with good intentions :-laf