Seco 17004489 Thread Mill 1/4-18 Npt 3 Flutes Solid Carbide

Product Description

The SECO 17004489 is a straight flute thread mill designed for cutting NPT threads in both external and internal configurations. Built from solid carbide and finished with an AlCrN coating, this tool delivers wear resistance and thermal stability in demanding machining environments. It mills 1/4-18 NPT threads at 18 teeth per inch (TPI) using 3 flutes, with a cutting diameter of 0.305 inches and a length of cut of 0.625 inches. The 5/16-inch shank diameter and 3-inch overall length make it compatible with standard CNC milling setups. Machinists and tool and die professionals working in precision threading applications will find this a reliable single-tool solution for NPT thread forms.

This thread mill is suited for shops producing NPT-threaded pipe fittings, fluid system components, and pneumatic ports in materials where solid carbide tooling is specified. It handles both internal and external thread profiles in a single tool, reducing tool changes and setup time. The AlCrN coating improves performance in dry or minimum-quantity lubrication (MQL) cutting conditions and extends tool life in abrasive or high-temperature alloys. It is appropriate for use on CNC machining centers capable of helical interpolation.

Key Features

• Cuts 1/4-18 NPT threads — external and internal — in a single tool
• 3-flute straight flute geometry for consistent chip evacuation
• AlCrN coating for heat resistance and extended tool life
• Solid carbide construction for rigidity and dimensional accuracy
• 0.305-inch cutting diameter with 0.625-inch length of cut
• No coolant-through design — suited for dry or MQL applications

Compatibility

Designed for use on CNC machining centers capable of helical interpolation for NPT thread milling in external and internal thread applications requiring 1/4-18 thread form.

Installation Notes

This tool is installed by qualified machinists or CNC programmers on milling centers with helical interpolation capability. Confirm spindle taper and collet chuck compatibility with the 5/16-inch shank before mounting. Verify that machine programming follows correct helical interpolation parameters for the NPT thread pitch and diameter. Do not use this tool on manual mills without CNC thread-milling capability.