I read somewhere that you don't need to anneal the ends at all. Because the screw is only case hardened, you can take another approach: On a "real" lathe, set the depth of cut for your first pass to be large enough to cut through the entire thickness of the hardened outer edge in one pass. Once that is done, machine it like any other soft steel.
This might seem counter-intuitive, but it does make sense. I have not personally done this. Has anyone here? Does it work? |