Minimum Hole Distance to Edge

That's a DOH! for me. I should have thought of that. Now I can center the threaded hole in the available material. Thanks
 
Shorter version.jpg

This is what it would look like with a 2 - 56 x 3/8.
Are you tapping blind or can you do a through hole?
 
I was planning on tapping blind. I just burned the end off a #50 HSS drill bit. Looking for something that will drill the stainless.
 
I like carbide but HSS will work. Keep the rpm's down and the feed higher than you would for steel.
Lots of coolant as the stainless will work harden.
 
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