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Hardness of needle

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  • Hardness of needle

    A friend wanted to know what the hardness of a sewing machine needle is. First of all, are they made of hardened stainless steel? What would it be on HRC scale?

    Also, how would you measure hardness on a sample that small?


    [This message has been edited by rotate (edited 09-01-2004).]

  • #2
    Usually high carbon steel wire, chrome and sometimes platinum plated.
    Free software for calculating bolt circles and similar: Click Here

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    • #3
      I've used them for screwdriver blades.(small blades, as in watch size)

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      • #4
        With the ends ground off square and set into a 3/8 cold rolled handle the machine needles make excellent miniature pin punches.

        I'm thinking the harness must be around 55-58c,any hrder and they would break like glass.
        I just need one more tool,just one!

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        • #5
          PSD Ken, thanks for the tip on using needles for small screwdrivers.
          THAT OLD GANG 'O MINE

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