Thread: AN Fittings?

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Hey guys, I am looking into learning about AN fittings. My first question is-Where do the sizes come from? 6AN, 8AN etc. Are they metric sizes? Or are they on a whole different size system? Next, are they All aluminium? And, how do they mate to the hose? Can you cut steel braid hose to length and put on the AN fittings yourself?

Originally Posted by josh bichard

Hey guys, I am looking into learning about AN fittings.

Pretty good explanation here: http://en.wikipedia.org/wiki/AN_thread
And yes, you can make up your own hoses.

Bob

Hi Josh,
I haven't gone to an yet myself so I can't answer the 1st 3 questions but yes, you can cut the hose and do it yourself. It does have to be done properly however and there are several sources for doing this. Google "AN hose assembly" and see what you get. I believe Street Rodder did a article on this awhile back and may have the procedure on their web site.

Jack.

“Army-Navy” (AN) sizes were established by the aircraft industry to meet military standardization for aircraft. The numbers are equal to the outside diameter (OD) of the tubing in sixteenths. Since tubing and hoses can have different wall thicknesses, the size number does not necessarily tell you how large the inside diameter will be.

AN sizes are really quite simple, the dash number, ie -4, -6, -8 etc refers to the hose size in sixteenths of an inch.... A -8 hose is 8/16", or 1/2". A -4 is 4/16", or 1/4". When you buy the components, it's best to keep them all the same brand and the same product line to ensure compatibility....

Not hard to make up your own, do some studying on the various manufacturer's sites and there are some very good instructions....

Oooh - great minds think alike, but Evo's fingers are faster!

Originally Posted by Evolvo

Glenn, thats really pretty funny. I guess that typing class I took in 8th grade has finally paid off, although I see Prof Severson got in a little ahead of both of us. What's even more amazing is that we all AGREED!!

Agreed???? Man, we better not let that ever happen again!!!!!

While we are on the subject of An fittings, whats the best way to cut the stainless lines. I have the fitting ready to go, but need to cut the hoses to length!

Originally Posted by stovens

While we are on the subject of An fittings, whats the best way to cut the stainless lines. I have the fitting ready to go, but need to cut the hoses to length!

the best way i have found is to use a air cut off with a thin cut off wheel one thing i will add i did not see anyone one add this ?? is why i do not care much for the braided ss hose it makes a great hack saw so if you lay the hose up on any thing with out clamps it well cut in things like valve covers ect. my next job dry sump pan engine. i save up my milk money for starlite hose

The summit cutter seems the way to go. Eventually I will use all braided lines for bling value( I know pure stupidity) but it's just one of those things like a little billet in the right place, makes the job look a little neater!

Originally Posted by stovens

The summit cutter seems the way to go. Eventually I will use all braided lines for bling value( I know pure stupidity) but it's just one of those things like a little billet in the right place, makes the job look a little neater!

cut off wheel will not go dull

Originally Posted by Evolvo

Look at that, now Pat and I are on the same page!!!!!!!

after the smell of burning rubber i washer with dawn dish soap and blow dry dawn works good on oily ducks to.if you need to wash any i have used dawn soap as well to put the fitting s on the hose as well works good .just do not wash the new lines with the dishes OH you have not made very many lines till you jamed some of the SS wire under your finger nails

Dave, Do you recall what the length of the triangular bars are?

Thanks, Ed

Lotta good info. Thanks guys.

One more question. I just ordered a fuel line from russel for my holley 4150 that says it has a 6AN inlet. My mechanical fuel pump has 1/4 inch npt inlet. So would I need a hose with a 6an on one end and a 4an on the other? If so, what size hose should I use?