I'm using Sumitomo CCMT32.52ESU AC52OU. Most of these numbers mean something but I always have to look it up. This is the style and size of insert holder I have for external and some internal tools. Not very expensive either. I got 10 for $60 at my local tooling store (Nates Industrial Tools in Torrance CA).? I can walk there if i want but rarely do. Online I belive they are even cheaper. The inserts I had originally came from The Little Machine Shop which were fine for regular mild steel but didn't like the stainless.
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Bill From Socal
