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Thick stubby drills

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sparky961:
See if you can find some 4140HT or 4340HT. Its a bit tough to break the chip at lower feed/DOC but getting a nice finish is relatively easy. You also end up with a part thats moderately hard but not brittle. This is my go-to material for one-off thread gauges and other tooling.

PekkaNF:
As luck would have it, I have 42CrMo4. Tempered form.

36CrNiMo4 is whole lot harder to work with, specially internal threading or long holes. Makes very nice shaft though.

Pekka

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