Kennametal 4176031 Threading Insert Stub Acme 5 Tpi KCU10

Product Description

The KENNAMETAL 4176031 is a carbide threading insert designed for cutting Stub Acme threads at 5 threads per inch (TPI). It carries the NAS3R5 insert style designation and features an AlTiN finish applied via PVD coating process, which improves wear resistance and heat tolerance during threading operations. With a 29-degree included angle and a right-hand orientation, this insert suits both internal and external thread forms. The KCU10 grade carbide substrate is engineered for consistent performance in threading applications where edge integrity and surface finish are critical. Licensed machinists and CNC operators install this insert in compatible Top Notch toolholders.

This insert fits residential and industrial machining environments alike, including job shops and production floors running CNC lathes or manual turning centers. It is sized as Insert Size 3 within the Top Notch series and is appropriate for operators cutting Stub Acme thread profiles on shafting, lead screws, or threaded components requiring a 29-degree flank angle. The right-hand cutting orientation covers the most common thread direction encountered in general machining work. Both internal and external threading applications are supported with this single insert geometry.

Key Features

• Stub Acme thread standard with 5 TPI internal pitch and 29-degree included angle
• KCU10 carbide grade with AlTiN finish via PVD coating for extended tool life
• Supports both internal and external thread cutting in a single insert
• Right-hand cutting orientation, NAS insert style designation
• Cutting tip width of 0.0793 inches (2.01 mm) for precise thread form control
• Corner radius of 0.0050 inches (0.13 mm) for sharp, defined thread root geometry

Compatibility

Designed as an OEM-style replacement insert for Top Notch series threading toolholders that accept Insert Size 3 NAS-style carbide threading inserts.

Installation Notes

This insert is installed and replaced by machinists or CNC tooling technicians. Power down and de-energize the machine spindle before changing inserts. Seat the insert firmly into the Top Notch toolholder pocket and verify clamp engagement before resuming cuts. Handle carbide inserts with care to avoid chipping the cutting edge during installation.