What type of fitting is this? (trans oil cooler))

[Fred_M1010]

I'm about to order an oil cooler for my transmission,
and would like to make sure I get all the right fittings and stuff right away...

What type of fitting is it that connects the stock lines to the radiator:

I thought it was a NPT-thread, but it doesn't make sense.
The size doesn't correspond to any pipe thread I know of...

I've measured the diameter of the threads to ~0.49"
and the pitch is 20tpi.
(1/2" UNF!!!???)

And it seems to have a slight taper but I'm not 100% sure

 

[76zimmer]

Its a tapered seat flare, fitting I believe for 3/8" i.d. tubing.
there should be a pipe thread to flare fitting adapter in the trans case, you could take one out to a parts house for proper fit.

 

[Fred_M1010]

OK, thanks!
The lines seems to be 5/16" o.d. though.

But I see now that the cooler I looked at, comes with adapters
with compression fitting in one end and barbed hose fitting in the other end.
So maybe I don't have to think about the radiator fittings.
I'll just cut of the return line and install the hoses with the adapters.

Derale Atomic-cool 13950:

http://www.summitracing.com/parts/DER-13950/?rtype=10

Now I just have to make sure the compression fittings fits my lines...

 

[wasted wages]

aka....an inverted flare...

 

[76zimmer]

OK, thanks!
The lines seems to be 5/16" o.d. though.

But I see now that the cooler I looked at, comes with adapters
with compression fitting in one end and barbed hose fitting in the other end.
So maybe I don't have to think about the radiator fittings.
I'll just cut of the return line and install the hoses with the adapters.

Derale Atomic-cool 13950:

http://www.summitracing.com/parts/DER-13950/?rtype=10

Now I just have to make sure the compression fittings fits my lines...

That would be correct Fred....I was

 

[y5mgisi]

AKA double flare.

 

[sweetk30]

doubble 45* flare 5/16" line fitting.

if we add up all the info in one line.

 

[Fred_M1010]

Great thanks

 

[folkenheath]

Yes, it's called an "inverted flare" or IF fitting as these guys have stated, which is actually a double flare (buckled and then folded over itself). Single flares were not reliable because they could split the line when it was tightened enough to punch the steel line. The threads are straight because the line itself is pinched in the tapered fitting it screws into. You can buy tools to make the double flare for about $30-$50 (aptly called a "double flaring tool"). Its the same tool you need to double flare the high pressure brake lines if you make your own lines. That one will be 1/2" thread for a 5/16" line. But they also have 3/16", 1/4" and 3/8" lines as well. All of them have slightly larger threads. Pretty inexpensive, reliable, and withstands very high pressure.

 

[Fred_M1010]

Yeah I thought they looked a lot like brake-lines...
But I still don't know where to get a female adapter for it.
Derale claims to have it on page 34 in this catalog:
http://inet.derale.com/clientdocs/Derale-Catalog-2009.pdf
(part.no.13018)
But they say it's 5/8 inverted flare fittings...
And to add to the confusion, Summit sells the same part.no as 3/8 NPT...

So I'll probably use compression fittings on the lines instead.
But there as well I've found conflicting information.
If you check out page 19 in the same pdf-catalog,
it says that they include the following:
"two compression fittings (3/8” x 3/8” hose barb OR 1/2” x 1/2” hose barb)"

From that I drew the conclusion that #13950 came with 3/8",
and 15950 comes with 1/2"....


But when i read about the 13950 on their web-site it says:
"5/16" AND 3/8" compression fittings"

So now I've e-mailed Summit customer service about it...

 

[folkenheath]

Yeah I thought they looked a lot like brake-lines...
But I still don't know where to get a female adapter for it.
Derale claims to have it on page 34 in this catalog:
http://inet.derale.com/clientdocs/Derale-Catalog-2009.pdf
(part.no.13018)
But they say it's 5/8 inverted flare fittings...
And to add to the confusion, Summit sells the same part.no as 3/8 NPT...

Adapted to what type? The 5/8" IF are usually for 3/8" lines.

Also, I think the summit title is wrong, if you look at the overview it says IF, but it say 3/8" IF, which is probably wrong. I think they have some typos there.

http://www.summitracing.com/parts/DER-13018/

As for the female end, I just cut it off, remove the fitting, and double flare it again, then slide the hose over the double flare. No need for a fitting. Or just bend it back and push the fitting out of the way, you can always return it to stock again then if you have a hose blow out. And "double clamp" those hoses, I have had them blow off before, and it's not good.

 

[sweetk30]

i wouldnt use comp fittings.

thay make brass pipe thread to doubble flare adaptors for 2-3 bucks each . i get them from the local napa parts store all the time.

 

[Fred_M1010]

Adapted to what type? The 5/8" IF are usually for 3/8" lines.

Also, I think the summit title is wrong, if you look at the overview it says IF, but it say 3/8" IF, which is probably wrong. I think they have some typos there.

http://www.summitracing.com/parts/DER-13018/

As for the female end, I just cut it off, remove the fitting, and double flare it again, then slide the hose over the double flare. No need for a fitting. Or just bend it back and push the fitting out of the way, you can always return it to stock again then if you have a hose blow out. And "double clamp" those hoses, I have had them blow off before, and it's not good.

I was thinking adapter to brittish pipe thread.
But you have a good point, the flare would probably be enough to hold a hose with double clamps.
But I'd like to stay on the safe side...
Once i used a straight pipe with no barbs or flare to temporary fix a broken oil hose for the turbo in my tractor...
Then I totally forgot about it, until a year later when it slipped of and I had to rebuild the engine

I got an answer from Summit now also, the 13950-kit included two 5/16 fittings and two 3/8 fittings

i wouldnt use comp fittings.

thay make brass pipe thread to doubble flare adaptors for 2-3 bucks each . i get them from the local napa parts store all the time.

Problem is we use brittish pipe thread here, and I'm not sure there are adapters for that, but I I'll look into that later.
But now I know I can use whats in the kit if all else fails.