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By klaas0639
For a wood working project, I want to make specially shaped chisels from O1 steel. To fix these small chisels I want to make threaded holes in it (diameter 5 mm). Can this be successful or will the thread seriously be affected by the hardening process (corrosion or what so ever).

kind regards
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By Pete Maddex
No problem at all, I made a spokeshave blade the same way.

ImageRosewood Spokeshave by Pete Maddex, on Flickr

And their is no way you are going to be able to tap the threads afterwards.