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I think the threads on those AN unions, the ones opposite the flare, are actually a straight (not tapered) pipe thread. That's why they need to be sealed with an o-ring. Some of them are very close to SAE screw threads, unfortunately only close, not exact. They were what fit the oil coolers on the Eagle540 (pic attached). A look at a Machinery's Handbook should answer the question definitively. I would also imagine there is a complete set of prints for AN fittings that outline the mil-specs they are built to somewhere on The Net. If I had some time I'd do the search, but I just got back to Orlando from LA, am on my way back to Ft Myers to bail my beast out of doggie jail, then back to Orlando... when I finally stop moving I'll check and report. (Unless someone beats me to the punch....)
<Marv>
> > > It's a mystery. The catalog where I found the specs was from 2002, so I was
afraid the NPT specs were the old ones. I got the adapter today, and I
don't have any fittings at home to try, but it's easy to see that the female
threads in the adapter are tapered, so they have to be NPT. That's good
news for me. Very nice adapter, but kinda pricy. < < <
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