Kennametal 4176208 Threading Insert 9 Tpi Carbide Altin

Product Description

The KENNAMETAL 4176208 is a carbide threading insert in the Top Notch series, designed for external thread cutting on UN-standard threads at 9 TPI. The insert carries the KCU10 manufacturer grade and features an AlTiN finish applied via PVD coating process, which provides elevated heat resistance and wear performance in demanding threading applications. It is a right-hand insert with a 60-degree included angle and a 0.0140-inch corner radius, giving consistent thread form on external profiles. Machinists and toolroom operators install this insert into compatible Top Notch threading toolholders on CNC lathes and turning centers.

This insert is suited for external threading operations on UN-standard workpieces in production turning environments. The NTC3R9E style designation identifies the insert geometry, hand, and pitch class, making it a direct selection for shops running 9 TPI UN external thread programs. It is appropriate for both production runs and job-shop threading work where carbide with PVD AlTiN coating is specified for longer tool life on ferrous and difficult-to-machine materials.

Key Features

• Carbide substrate with PVD-applied AlTiN coating for heat and wear resistance
• 9 TPI external UN thread standard, right-hand cut
• 60-degree included angle for standard UN thread form
• Corner radius of 0.0140 inches (0.36 mm) for controlled thread root geometry
• Insert size 3, Top Notch series for direct toolholder compatibility
• Insert thickness of 0.195 inches (4.95 mm)

Compatibility

Designed for use in Top Notch series threading toolholders that accept size 3 NTC-style inserts. Specific toolholder compatibility should be verified against KENNAMETAL Top Notch toolholder documentation prior to installation.

Installation Notes

Threading inserts of this type are installed and replaced by machinists on CNC or manual turning equipment. Power down and lock out the machine spindle before changing inserts. Use the appropriate torque wrench and insert-clamping hardware specified for the toolholder to avoid insert seating errors. Handle carbide inserts carefully to prevent chipping of the cutting edge prior to use.