Jim Chandler wrote:

Speaking of which, does anyone know what "aircraft quality" aluminum
actually is? As far as I know, there is no such designation. The stuff
I've been using in my ultralight is 6061-T6 but I don't think it's
called "aircraft quality". Just another marketing ploy.

Jim

Bingo!

Wanna see someone get either wierded out, or just stare at you with a
blank look, ask for the certs that prove it is fit to use on airplanes.

Lot's of good stuff goes into some airplanes, and lots of low grade
cheseball **** gets used to! It's all aircraft grade, if it's the stuff
spec'd.

Same bull**** for Mil-Spec. There are mil specifications out there
that cover ALL sorts of junk.

Cheers
Trevor Jones