Thread rolling fittings.
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Previously:
https://www.homemadetools.net/forum/...161#post141528
https://www.homemadetools.net/forum/...3730#post99885
https://www.homemadetools.net/forum/...855#post175335
https://www.homemadetools.net/forum/...931#post175666
https://www.homemadetools.net/forum/...210#post169082