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Old 01-20-2010, 02:43 PM   #1
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Measuring AN fittings

I have a set of AN fittings on my tranny to connect my tranny lines to but i dont know the size. Is there a way to measure the fitting to know what size hose to buy?

Thanks for the help,
Chas
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Old 01-20-2010, 03:00 PM   #2
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Re: Measuring AN fittings

Measure the thread on the fitting. Chances are it's 9/16-18, which is -6.
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Old 01-20-2010, 03:01 PM   #3
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Re: Measuring AN fittings

They're most likely -6.

Here's a tech article I wrote for my own site. Sorry the table comes out a little crappy. I have no other way to post it here. You'll have to count cells.

The AN system is often a source of confusion. It however is, a real handy and easy to understand system once you understand how, and especially why it's used the way it is.

The AN sizes are shown as dash #, for example -6. The numeral represents a fraction of 16. So -6 stands for 6/16 = 3/8.

What this means is, that a -6 AN sized piece of hardware is compatible with a 3/8 OD hard line. This makes figuring out what combination of hard line, flare size, tube (b-) nuts & sleeves and adapters you will need to mate it to a flexible line using hose ends.

The dash size does NOT mean your flexible line has an ID represented by the dash size. What it does mean is, that the hose and hose end have an ID comparable to the ID of a 3/8 OD hard line.

So, if for example you want to plumb a system starting out with a 3/8 OD sized hard line, you will need -6 sized components.
You will need one -6 flare (b-) nut and one -6 flare sleeve and a 3/8 sized 37 degree (double) flare to create your hard line coupling. This will then mate to a -6 sized male adapter or hose end (provided you have a male ended hose end). In case you have an ordinary female ended hose end, you will need a -6 flare union to hook the hard line to your -6 sized hose with the -6 hose end.

Some sizes are uncommon in automotive applications, an example is the 5/16 or -5 size. 5/16 is commonly used for fuel lines and automatic transmission cooler lines. The problem is, a -5 hose and hose end is impossible to find. What you need is a -5 flare (b-) nut and sleeve and a -5 to -6 flare union. Aeroquip sells these.

Here's a stainless tube, single flared for a 37 degree flare (this is seamless aircraft quality tubing, a double flare is only needed on non seamless tubing) with (from left to right) a flare (b-) nut, a flare sleeve and on the right an an adapter fitting (with in this case some custom fabbed breather gizmo)

Click the image to open in full size.

For low pressure applications you can also get away with using a tubing or hard line adapter. These are usually (the popular automotive ones) pretty anodized aluminium fittings with a brass ferrule. Because of this they don't bite the steel tubing well enough to be used in high pressure applications. An automatic transmission cooler line however can be easily plumbed with them, and the neat thing is, they come in male and female, so if you want to use hose ends make sure you use the male type.

Some manufacturers (like Russell) have a tech paper on their site instructing that the fractional sizes directly represent the hose sizes. This is wrong (and I have no idea why they print that)

AN Size - 2 - 3 - 4 - 5 - 6 - 8 - 10 - 12 - 16 - 20 - 24 - 28 - 32
Tube OD 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 1" 1-1/4" 1-1/2" 1-3/4" 2"
SAE Thread Size 5/16-24 3/8-24 7/16-20 1/2-20 9/16-18 3/4-16 7/8-14 1-1/16-12 1-5/16-12 1-5/8-12 1-7/8-12 2-1/4-12 2-1/2-12
B-Nut Size ... ... 9/16" ... 11/16" 7/8" 1" 1-1/4" 1-1/2" 2"
Pipe Thread Size (NPS) 1/8-27 1/4-18 3/8-18 1/2-14 3/4-14




Here's the table shown on the Russell and Edelbrock site. This is wrong!

Click the image to open in full size.
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Old 01-25-2010, 05:01 PM   #4
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Re: Measuring AN fittings

Great Info! You don't really touch on the soft hose (the type I will be using for my application.) Will it be the same as using a hard line?

The lines are going to be ran from the tranny to my tranny cooler so im not running hard lines.

I'm guessing that I need different hardware for the flexible/soft hose (Braided stainless steel) hose?
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Old 01-25-2010, 05:06 PM   #5
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Re: Measuring AN fittings

You didn't read it all. The sizes are all by hard line. So a -6 soft line will have the same ID as a 3/8 OD hard line. It may sound confusing but once you understand why it's done that way it's actually pure genius. no need to think twice about what to select. 5/8 hard line? Ok, -10 AN it is for hoses, fittings, flare nuts and sleeves. No clowning around with all different sizes like the funky NPT sizing.
OEM tranny lines are 5/16, -5AN is a weird size. You can get -5 tube nuts and sleeves from aeroquip or a hydraulics supply, aeroquip also sells a -5 to -6 union so you can hook it to a -6 sized hose w/ hose ends. If you want soft line all the way from the tranny simply use -6 hose. Similar to a 3/8 hard line, that's obviously larger than stock 5/16 and as such more than adequate. Tranny adapters are said to be 1/4 NPT but they actually are not they are not a tapered thread. The 1/4 NPT to -6 Adapters will work, just don't over tighten then and crack the case. You could also retain the stock brass inverted flare adapters, you'll have to get a proper inverted flare to -6 AN adapter. Forgot which size the threads are though so I can't help you there.
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Old 01-25-2010, 05:12 PM   #6
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Re: Measuring AN fittings

Quote:
Originally Posted by Twin_Turbo View Post
You didn't read it all. The sizes are all by hard line. So a -6 soft line will have the same ID as a 3/8 OD hard line. It may sound confusing but once you understand why it's done that way it's actually pure genius. no need to think twice about what to select. 5/8 hard line? Ok, -10 AN it is for hoses, fittings, flare nuts and sleeves. No clowning around with all different sizes like the funky NPT sizing.
OEM tranny lines are 5/16, -5AN is a weird size. You can get -5 tube nuts and sleeves from aeroquip or a hydraulics supply, aeroquip also sells a -5 to -6 union so you can hook it to a -6 sized hose w/ hose ends. If you want soft line all the way from the tranny simply use -6 hose. Similar to a 3/8 hard line, that's obviously larger than stock 5/16 and as such more than adequate. Tranny adapters are said to be 1/4 NPT but they actually are not they are not a tapered thread. The 1/4 NPT to -6 Adapters will work, just don't over tighten then and crack the case. You could also retain the stock brass inverted flare adapters, you'll have to get a proper inverted flare to -6 AN adapter. Forgot which size the threads are though so I can't help you there.

oooo ok i get it now...took me a min, I did read the entire post just didn't understand what it was saying at first...thanks for clearifying tho .
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Old 01-25-2010, 05:15 PM   #7
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Re: Measuring AN fittings

and now that you understand how it works you can clearly see why the little table from russel/edelbrock is incorrect. 1/4 hose is not -4. 1/4 OD hard line = -4 and a hose w/ the same ID as a 1/4 hard line as such will have a larger OD than 1/4. This bad info is all over the place.
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Old 01-25-2010, 05:15 PM
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