This was answered off list and this is such a great source I had to post it.
Thanks to Bruce McGuire and Randy Smith for the great lead.
Wow. An internet hardware store...with everything.
How about McMaster Carr www.mcmaster.com <http://www.mcmaster.com>
page 2970, Grade B16 Alloy Steel. 125,000psi tensile. Equal to grade 5
I usually cut this stuff in a lathe with a carbide parting tool, but an
abrasive wheel will work.
This is what I use on machining fixtures where the nuts must go on and
off thousands of times.
Bob Melusky
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