Threadmilling problem

[Matthew Hajicek - Conventus 4,087]

Did you use the sharp pointed Harvey threadmill, or the "tipped off" one for "hard materials"?  The sharp pointed ones break down much faster.

[taperlength 104]

For a UNJC  thread make it the max minor hole diameter,  .094 inch.    Another trick is to run progressively bigger passes,  starting .001 higher each time so its cutting on one side like a lathe threading tool.

[Sumac Andy 7]

 A bit late to the party, but.....

I'm with the tapping guys here - we use WNT and tap 316etc... with this tap - Blind hole – Machine taps, right hand | CERATIZIT | WNT | KOMET - and it works with a decent oil.
Unsure if you can get these tools in th US though?