Allied Machine HDTM18NPT Helical Flute Thread Mill Npt

Product Description

The ALLIED MACHINE AND ENGINEERING HDTM18NPT is a solid carbide helical flute thread mill designed for cutting both internal and external NPT threads in a single helical pass. It runs 18 teeth per inch (TPI) and produces a 0.363-inch cutting diameter with a 0.68-inch length of cut. The TiAlN coating improves heat resistance and extends tool life in ferrous and hardened materials. With a 3/8-inch shank diameter and a 3.5-inch overall length, this tool mounts in standard CNC machining centers and is handled by machinists and tool-and-die professionals working in precision threading applications.

This thread mill is suited for NPT thread applications in materials where a single-point or tap-style operation is less practical. The right-hand flute direction and 4-flute geometry provide chip evacuation and surface finish control during helical interpolation. It is appropriate for use on CNC machining centers capable of helical interpolation, covering internal bores with a minimum nominal diameter of 0.25 inches and compatible external thread profiles of the same standard.

Key Features

• Cuts both internal and external NPT threads with a single tool
• 18 TPI with 0.363-inch cutting diameter for consistent thread form
• TiAlN coating for improved heat resistance and extended tool life
• 4-flute right-hand helical geometry promotes chip evacuation
• Solid carbide construction for rigidity and dimensional stability
• No coolant-through requirement simplifies setup

Compatibility

Designed for NPT thread milling on CNC machining centers capable of helical interpolation, with a minimum nominal thread diameter of 0.25 inches for internal applications and equivalent external NPT profiles.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with CNC helical interpolation programming. Secure the 3/8-inch shank in a properly sized collet or tool holder rated for the intended RPM and feed rate. Confirm machine spindle and toolpath parameters match the NPT thread standard before cutting. Always inspect the tool edge for wear or chipping before each use and replace if damage is observed.