, I already started this project using plain 1020, so why would you say chrom-moly-nickel would be better choise? Also I did cut ID threads, it was exactly what I had measured and its perfect fit.
Minor Dia Pitch Dia Major Dia Tap Drill
Class min. max. min. max. min. max.
M39x1.5 6 H 37.376 37.676 38.026 38.226 39 39.417 37.5
Just hate to start allover when I'm almost done...