Kennametal 4175979 Threading Insert NT3LCK KCU10 Carbide

Product Description

The KENNAMETAL 4175979 is a carbide threading insert designed for precision thread-cutting operations on CNC lathes and turning centers. Manufactured in the NT3LCK style and offered in the KCU10 grade with a PVD-applied AlTiN finish, this insert handles both internal and external threading applications. The left-hand configuration suits specific spindle orientations and back-turning setups. With a 60-degree partial profile geometry and a Chipbreaker K designation, it produces consistent thread forms across a wide pitch range of 2.50 to 4.00 mm (6 to 11 TPI external) and 4.00 mm (6 TPI internal). Machinists and CNC operators working in job shops or production environments rely on this insert for repeatable thread quality in ferrous and difficult-to-machine alloys.

This insert belongs to the Top Notch series, a widely used indexable threading platform. It is suited for external pitch ranges of 2.50 to 4.00 mm (6 to 11 TPI) and internal pitch at 4.00 mm (6 TPI). The partial profile 60-degree thread standard makes it applicable to Unified, ISO metric, and similar 60-degree thread forms. Typical use cases include threading of shafts, couplings, fittings, and threaded bores on manual or CNC lathes in both production and maintenance-repair-operations environments. The AlTiN coating improves wear resistance and thermal stability, extending tool life in dry or semi-dry cutting conditions.

Key Features

• KCU10 carbide grade with PVD AlTiN coating for elevated wear resistance and thermal hardness
• Partial profile 60-degree geometry cuts multiple thread pitches without changing inserts
• Left-hand insert orientation for back-turning and specific machine configurations
• Chipbreaker K design promotes chip control during threading passes
• Handles both internal and external thread forms in a single insert style
• Top Notch series platform for secure, repeatable indexing in compatible toolholders

Compatibility

Designed for use in Top Notch series threading toolholders that accept NT3 size, left-hand inserts. Specific toolholder compatibility should be confirmed against KENNAMETAL Top Notch series toolholder specifications for NT3LCK insert style.

Installation Notes

Installation and indexing should be performed by a qualified machinist or CNC tooling technician with the machine powered off and the spindle locked. Use the appropriate torque wrench and KENNAMETAL-specified clamping hardware for Top Notch series toolholders to ensure proper seating. Inspect the insert pocket and clamping surfaces for chips or debris before seating a new insert. Confirm thread pitch and hand orientation against the workpiece drawing before initiating the threading cycle.