Curious about tool holder hardness

dodgin said:

I'm going to attempt to modify the threads on the bottom of a brand new tool holder, and although it's easy enough to stick the tools in under the assumption that it's going to be around 50RC, my curiosity is getting the best of me and my forum searches have yielded nil. Seems like the information should be floating around out there though.

It seems like there'd be some variables involved, but is there any sort of industry standard, generally speaking, when it comes to tool holder hardness?

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litlerob1 said:

What kind of tool holders are you asking about? Stick tools for a Lathe? CAT/BT tools for a Mill? Capto? The part where the tool goes into the tool holder? The part where the pull stud goes in? Collet? Collet chuck? Collet nut? What are you asking?

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dodgin said:

I've been staring at the thing so long I thought you'd know.

Mill tool holder - I'm about to go to work on a 50 taper holder. I don't know what this one is right off hand but it strongly resembles an NMTB 50 holder.

The part where the tool goes into the tool holder and the part where the retention knob go in are what's kind of got me curious right now because that's what I'm going after, but the whole thing in general kind of interests me. I tried to pull any information I could out of the rep who gave us the holder, who is normally a really knowledgeable guy, but he didn't have anything for me in this case.

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