Kennametal 2429571 Carbide Thread Mill Insert Nptf 14 Tpi

Product Description

The KENNAMETAL 2429571 is a carbide thread mill insert designed for cutting NPTF tapered pipe threads in both internal and external applications. Manufactured to insert style STN and coated with TiAlN via a PVD process, this insert delivers wear resistance and thermal stability during thread milling operations. The KC635M grade carbide substrate is engineered for extended tool life in a range of workpiece materials. With 14 teeth per inch and a 3/8 inch (9.53 mm) inscribed circle, it suits precision thread milling on pipe fittings, manifolds, and similar components requiring NPTF thread forms.

This insert is suited for use in CNC machining centers and thread milling toolholders where NPTF tapered pipe thread profiles are required. It supports both internal and external thread milling in a single tool path, making it a practical choice for shops producing hydraulic fittings, fluid system components, and pipe connection hardware. The NPTF thread standard ensures pressure-tight joints without the need for sealants when properly milled. Typical users include machinists and tooling technicians in job shop, production, and maintenance environments.

Key Features

• KC635M carbide grade with TiAlN PVD coating for heat and wear resistance
• Cuts NPTF tapered pipe threads for pressure-tight connections
• Handles both internal and external thread milling applications
• 14 teeth per inch for accurate thread form reproduction
• 3/8 inch (9.53 mm) inscribed circle — STN insert style
• Non-conical geometry compatible with standard thread mill toolholders

Compatibility

Designed for use with thread milling toolholders accepting STN-style inserts with a 3/8 inch inscribed circle. Suitable for NPTF thread milling applications where KC635M grade carbide inserts are specified.

Installation Notes

Installation and replacement should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and the machine is in a safe state before changing inserts. Use the correct torque wrench and insert screw hardware specified by the toolholder manufacturer — do not overtighten or substitute fasteners. Verify thread form and taper accuracy with an appropriate NPTF gauge after setup.