Solid Carbide Thread Mills were designed to cut high quality left or right hand threads in difficult to machine materials on a CNC Machine Center with helical interpolation. Internal and external threads can be cut with one tool and be more consistent than regular tapping. All tools are titanium nitride coated for maximum performance.
Solid Carbide Thread Mills page 250
Solid Carbide NPT Thread Mills page 251
NPT - Interrupted Thread page 251