Posted by 550Doug on May 10, 2017 at 15:30:49 from (23.239.41.228):
I bought a tap & die set years ago and haven't really had a need to use it, until today.I have a piece of 3/4 inch partially threaded rod in which I had to extend the thread another 2 inches. So I went to this tap & die set and found a die labeled as 3/4 NC10. I put it on the existing thread and BINGO, it fits. So I proceed to cut about 2 inches of extra thread. I do a few passes and then test with a nut. The nut of course runs over the original thread nicely but it stops at the new thread. It will not thread onto the new threads even with elbow grease.
So I looked at the original threads and they seem to have a sharp point where as the new threads have a rounder top profile. Then I checked the die more closely and found the word Tungsten M20 2.5 and then it dawned on me that this die might be METRIC!!
If that is the case is there anything that can be done to get the correct threading?
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