Kennametal 4176164 Threading Insert Ndc KCU10 Carbide Altin

Product Description

The KENNAMETAL 4176164 is a carbide threading insert designed for cutting NPT (National Pipe Taper) threads on both internal and external profiles. Built to the Top Notch series standard, this insert carries the NDC style designation and is manufactured from carbide substrate with a PVD-applied AlTiN finish for improved heat resistance and tool life at elevated cutting speeds. It is configured for left-hand thread cutting with an included angle of 60 degrees and an internal pitch of 11.5 TPI, making it a precise fit for NPT pipe thread applications. Machinists and toolroom technicians working on pipe fitting and valve components will find this insert well suited to production and maintenance turning operations.

This insert is used in threading operations on lathes and CNC turning centers where NPT pipe threads are required on ferrous and non-ferrous workpieces. The AlTiN coating performs well in dry or semi-dry cutting environments, making it a common selection for shops running higher spindle speeds without flood coolant. Both internal bore threading and external pipe thread turning are supported. The insert seats into compatible Top Notch series toolholders accepting the 3115 insert size.

Key Features

• Carbide substrate with PVD-applied AlTiN coating for extended tool life in high-temperature cutting
• NDC insert style in the Top Notch series, compatible with 3115-size Top Notch toolholders
• Cuts NPT threads at 11.5 TPI with a 60-degree included angle
• Left-hand configuration for reverse-thread applications
• Supports both internal and external thread profiles in a single insert geometry
• Corner radius of 0.0039 inches (0.1 mm) for controlled thread form accuracy

Compatibility

Designed for use in Top Notch series toolholders accepting the 3115 insert size. Verify toolholder designation and clamping configuration before ordering.

Installation Notes

Threading inserts should be seated and clamped by a qualified machinist following the toolholder manufacturer's torque and clamping specifications. Confirm the insert orientation matches the required thread hand before beginning a cut. Inspect the insert pocket for chips or debris before seating to ensure proper contact and avoid insert rocking. Replace the insert at the first sign of chipping or edge wear to maintain thread form accuracy.