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Bill,
"Case hardened" or "Through-hardened"? Either way, ditto on the cobalt drill bits, or for hole sizes larger than #20, maybe even "solid carbide".
FWIW, I do case hardening. It is typically done to give a wear-resistant surface on a part that otherwise needs to be somewhat ductile underneath - which won't be the metal's strongest state.
Dale R.
wrjjrs@aol.com wrote:
Kelly,
That is true "except" that the better quality allen bolts, Holo-Chrome, SPS, etc are case hardened. Be sure you get cobalt drills!
Bill Jepson
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