43 TPI

This topic has 25 replies, 12 voices, and was last updated 27 December 2021 at 19:49 by Chris Trice.

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27 December 2021 at 19:49 #577017
Chris Trice
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@christrice43267
Yes, it says so in Tubal Cain's excellent book on Drills, Taps and Dies.
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43 TPI

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