Kennametal 2429566 Carbide Thread Mill Insert Npt

Product Description

The KENNAMETAL 2429566 is a carbide thread mill insert designed for precision thread milling in both internal and external applications. Manufactured in the KC635M grade and finished with a PVD-applied TiAlN coating, this insert delivers wear resistance and thermal stability during aggressive thread milling operations. It is configured for NPT (National Pipe Taper) threading at 11.5 TPI and features a 5/8-inch (0.6250 inch) inscribed circle diameter. Licensed machinists and toolroom professionals use this insert in CNC machining centers where helical interpolation replaces traditional tapping for greater process control and tool life.

This insert is suited for shops producing NPT-threaded features in production or job-shop environments. Its STN insert style accommodates standard thread mill toolholders configured for that geometry. The TiAlN coating makes it appropriate for dry or near-dry cutting conditions as well as operations involving harder workpiece materials where heat generation is a concern. Both pipe fitting component manufacturers and maintenance machining operations will find this insert applicable for producing leak-free NPT-standard threads.

Key Features

• KC635M carbide grade with PVD TiAlN coating for extended tool life in demanding thread milling
• NPT thread standard at 11.5 TPI for pipe thread applications requiring taper conformance
• Compatible with both internal and external thread milling operations
• STN insert style geometry for use in matching thread mill bodies
• 5/8-inch (0.6250 inch) inscribed circle diameter for consistent seating and repeatability
• Lightweight at 0.0269 pounds, suitable for high-speed rotating tooling assemblies

Compatibility

Designed as an OEM-style replacement or direct-fit insert for thread mill bodies accepting the STN insert style. Confirm toolholder compatibility by insert style designation and inscribed circle diameter before ordering.

Installation Notes

Installation of thread mill inserts should be performed by a qualified machinist with the machine spindle fully stopped and the machine in a locked-out, tagged-out state. Use the correct torque wrench and insert screw specified by the toolholder manufacturer — do not overtighten, as carbide inserts are brittle and can fracture under excessive clamping force. Verify insert seating and runout before initiating a thread milling cycle. Program helical interpolation parameters according to the thread mill body manufacturer specifications and the NPT taper requirements of the application.