Neo -- AN couplings are
Army-Navy specification parts. This most commonly refers to an internally flanged nut and bushing (generally called a
B-Nut) that fits tubing to make a gas-tight seal. That is only one of the types of AN fittings. There are also swage fittings that
mate to the B-Nut fitting. I have all the data on them, but have not yet scanned them to PDF. If you can confirm the type of fitting you need to make, I have the data on it.
Military fittings developed by public investment of tax dollars have been being
privatized over the past 25 years. Even though most people in the field still say
MS33649 for the o-ring seal high pressure hydraulic port (developed for WWII), the geometry of such ports is now controlled by SAE and is
private intellectual property (identified as SAE
AS-5202 ports). Royalties are supposed to be paid for the use of such information (socialism for the rich, capitalism for the poor). This is part of the effort began in 1984 when the
National Bureau of Standards was "reformed" into the
National Institute of Standards Technology here in the U.S.
I do have quite a library of (U.S.) military specifications that are public domain. Printed on paper and bound in 3-ring notebooks they fill more than six feet of bookshelf -- though I also have many of them as PDF (when the grandkids get into trouble, scanning and formatting them into PDF is one of the punishments). If it is an actual
MS military specification and
FED or
DOD documents open to the public, you can generally download them from
https://assist.daps.dla.mil/quicksearch/ in PDF format. Branch-specific (Army, Navy, or Air Force) specifications were (mostly) removed prior to 1994.
I have something more than 600
AN specifications in my library. If we can figure out which one(s) you want, I will be happy to scan them in and post them -- or e-mail them privately. The copies ib]I[/b] have
are Public Domain documents!
