? American NPT For CNC Machining Centers and Milling Machines ? Need to make a thread on a non-rotatable bulky part ? In order to avoid thread distortion and insure thread quality we recommend that for standard thread profiles such as ISO, UN & Whitworth, the tool diameter should not exceed 70% of the bore diameter. ? Higher machine speeds ? Multi-tooth type inserts ? Less downtime and tooling changes ? Cost saving tooling system less expensive than HSS Taps and Dies ? Less machine power required ? Better thread surface finish yields better sealing and engagement ? No undercut is necessary due to CNC control accuracy ? Carbide inserts for a wide variety of workpiece materials