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Thread: Drill Bit Rockwell Hardness?

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    Gunco Regular smittygj's Avatar
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    Default Drill Bit Rockwell Hardness?

    What is the average Rockwell hardness of your average HS jobber drill bits?

    Specifically, ones like http://www.kbctools.com/usa/Main.cfm
    has on page 7 of their online catalog?

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    Unclear Engineer ozzy the nuke's Avatar
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    Here's a so so answer. I know that my cheap HHS bits will not drill a Ewbanks reciever. My good HSS drill bits have difficulty drilling them, and my cobalt bits go right through. IIRC, the recievers are "supposed" to be in the low 40s.
    No matter what happens, somebody will find a way to take it too seriously. ~Dave Barry, Dave Barry Turns 50

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    Gunco Rookie drhall762's Avatar
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    Default My Wilson Tester says...

    Just put a 5/16 bit on the Wilson Rockwell Tester. Got readings of 58 and 61 on the C Scale.

    Dave

  4. #4
    Gunco Veteran Steelcore1964's Avatar
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    I have noticed cobalt drill bits last about 4-5 times longer at about twice the cost. I also have noticed they almost never break like the HHS bits do.
    That which does not kill you, makes you stronger

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