Thanks for that.

Arent they bastards. I read this evening that american companies, like Miller and so tend to use metric or rare threads. Why? To f___ck their customers and discourage them from "this fits to that"

9/16"-18 UNF, i hear for that one for first time in my life :-). I also concluded that that M14 is a worthy candidate. As there are some Chinese adapters on the market that fit China plasma torches to 14x1.5 machines. Unfortunately the opposite to what i am going to do.

Will go tomorrow again to the local industrial supply to see what was the one that fit. A bit shameful having a lathe and don't know how to make the adapter myself , but don't have the time to dig into that