Captdave
Titanium
- Joined
- Sep 24, 2006
- Location
- Atlanta, GA
I’m searching for a source for thread and also geometry for machining AN fitting. Thanks.
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I don't have any specs on hand, but include JIC in your searches. JIC and AN are exactly the same thing as far as I've ever been able to find.
Charles, you can look up all the specs if you really want to verify this article, but this is essentially the same thing I've been reading about JIC vs AN fittings for years:
http://www.mechanicsupport.com/articleStronger.html
Cliff notes: Same exact specs except AN fittings have a tighter thread tolerance. Interchangeable in other-than aerospace-type applications.
SuperDave, what spec do Earl's, Aeroquip and the like make their fittings to? I know they're sold as AN fittings, but that could be just because the racecar world, for the most part, has no idea what a JIC fitting is.
SuperDave, do you know where the 40% reduction in strength comes from or is this an arbritary number that somewhat applies? Also on the link above, it states the root radius is decreased on the UNJF threads...I looked them up in a Sandvik catalog and the root radius is larger in comparison to standard UN 60 deg, not smaller, which would make much more sense than a sharp root for strength - which is correct? I also presume that UNJ's must be done with a thread specific insert to have the proper root radius, is this what you do?
I had a friend wanting to have me make up some -24's and -32's a while ago...kinda died out, but I did have a bit of a problem finding dimensions for these (and all fittings for that matter). I know they exist out there, just haven't spent too much time looking into it.
I have seen some really inexpensive "AN" fittings out there for the racecar crowd (well, I'm sure they are not real AN though)...I doubt if they 6 step their pipe threads, and most likely they are not UNJ 3A threads either...the price I have seen some of these wouldn't even cover the inspection costs.
SuperDave, set us straight!
Steve
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