Tapping Wrench

by 4ndy, published

Tapping Wrench by 4ndy Jul 6, 2011

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For holding hole-tapping bits.
Cheaper than any other wrench if you only want to get a couple of specifically-sized taps made from good steel.


  • Print out the two parts, heavy infill would be a good idea.
    ---(Ideally you could cast or machine the pinching block out of scrap metal, though the block might not even be necessary)
  • Ream out the 8mm hole with a drill bit, or tap it with your bolt itself.
  • Insert your bolt or studding.
    ---(Optional step for studding: drill a hole in it and stick something like a pin in it as a handle - pictured for an idea)
  • Use the bolt to drag an M8 nut into the captive nut slot.
  • Clamp it onto the square end of a tap, and go cut some threads!

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I'll make a simpler one.

4ndy - in reply to hintss

That's the spirit!

Nice and simple! Depending on how standardized your tap collection is I have been able to get by with an even simpler design (e.g. http://www.thingiverse.com/thing:5672http://www.thingiverse.com/thi... or maybe you could whip off a printable equivalent) which I think might be a bit more resistant to wear in the long term(?) - having said that I haven't printed your design here so maybe it's a non-issue...

Tap handle
by MarkU

if you are using a bolt, you may want to print this as well:


Cheers, I knew there had to be something out there to stick on the end of an M8 bolt, like wade's gear but with far less plastic. :-D