Interrupted Thread NPT Taps
Special purpose pipe tap, appropriate for threading a wide variety of materisl both ferrous and non-ferrous where chip disposal is a problem. The first few threads on an Interrupted Thread Pipe Tap are full. The balance of the threads are interrupted to reduce drag while taper pipe threading. These pipe taps are standard having an odd number of flutes.
For matching drill bit information, please check the NPT Tap Drill Chart