Perhaps Stauff Clamps makes something that will suit your needs.
John KK9A
From: Richard Smith N6KT
I'm involved in planning a station on PJ4, in which some yagis will be large
enough that a boom truss support will be needed. I would like to find a clamp
made of aluminum for connection to the aluminum boom. I'm hoping to find a
clamp that is all aluminum, or mostly aluminum (small amount of stainless
steel
hardware, none in direct physical contact with the boom). I have had some
of my
own experience, and have seen photos, of installations where a Stainless
Steel
or Galvanized Steel U-Bolt, Muffler Clamp, or bracket was used for attachment
of a truss to a boom. Dissimilar metal (galvanic action) at the attachment
point caused weakening of the boom, sometimes to the point where the boom
broke.
I have been searching online for a while and the links below show clamps that
are kind of close to, but not quite matching, my idea of an aluminum boom
clamp
for this application:
TETRIX® MAX Tubing Coupler (W39379)
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http://www.leetackle.com/clampaccessories.html
If anyone has already solved this design challenge, I would appreciate if you
would share the details.
Thanks and 73,
Rich, N6KT
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