AN stands for??

[xxalexx at ix.netcom.com]

>   I am at a loss.  I can not find out what an 'AN' size fitting is/means.  I have found out that 'Boss' is the same thread size.  I can go into a parts store and ask for a #10 MB (Male Boss) fitting > Clarence
> 
AN is a military specification, I'm pretty sure means ArmyNavy.
The spec. was made before the airfarce existed.
There is usually a hydraulic hose store or Aeroquip dealer around,
or your a FBO (fixed base operator) AP mechanic at local airport,
that know there fittings.
alex