SNIP

They are aluminum, I have them and the top side is already
welded.  It looks like the default is 356-F aluminum, but the
starred items are 6061-T6.  If 6061-T6 is better then the
full couplings could be used and cut down.  Any drawbacks
to using the 356-F?
--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

356 (don't know about the "F") is a good, strong casting alloy.
6061 is usually extruded.  I would expect the 6061 items are
made from bar stock on a screw machine and the 356 items
are machined from castings.  Both are good alloys, medium
high strength, weldable.

Bill

 
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