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Thread: threaded insert tap

  1. #1
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    Default threaded insert tap


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    I use 3mm threaded inserts, like helicoil but cheap no brand ones.
    The tap that came with the set is I think what's called a starter tap
    and does not thread the hole all the way to the end.
    I would like a tap that does, any ideas what I should search for ?

    On my tap is written: ST3X0.5 H2 HSS

  2. #2
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    Default Re: threaded insert tap

    A standard tap in your size. Or grind the blank bit off!

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    Default Re: threaded insert tap

    threaded insert taps dont have their size wrote on them
    and searching for 3mm threaded insert tap didn't help

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    Should Get Out More Ant's Avatar
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    Default Re: threaded insert tap

    Plug tap. Sometimes referred to as a bottoming tap.

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    Yma o Hyd Druid's Avatar
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    Default Re: threaded insert tap

    The taps that come with insert kits are stamped with the size of the insert they are used for, not the size of the thread they cut. We use a lot of them at work for M4, M5, M6, M8 and M10 and up to M6 the taps are 1mm larger than the insert. Based on this you will need an M4x0.5 tap. As Ant said you want a plug or bottoming tap

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    Default Re: threaded insert tap

    Thanks Druid and Ant , I will get a 4x0.5 bottom tap.

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    Default Re: threaded insert tap

    also these guys

    https://www.tracytools.com/

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    Default Re: threaded insert tap

    i think the taps are called STI taps , so you need an M4 STI bottoming tap.
    Re Coil do them cheaper than my link

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