On Tue, 04 Feb 2014 16:18:04 +0000, Bob Lowe
wrote:

Hi again- Apparently there is no standard 'Grade' for Aircraft hardware
such as bolts and nuts, only Aircraft 'Quality'. Does anyone know of any
'Standards' for this 'Quality'? The best that I can determine is that
each manufacture of Aircraft Quality Hardware have their own standards and
are not made to any 'Industry' standards. I have found out that some
manufactures will not even give a PSI rating for their nuts and bolts,
only stating that they are of 'Aircraft Quality'. Can anyone put more
light on this?
Thanks,

Yes there are standards. I seem to remember a reference to "AN"
fastenings - the AN said to mean Army-Navy.

Do a bit more research. Perhaps check the McMasters or Aircraft Spruce
site.
--
Cheers,

John B.