Kennametal 5914889 Grooving Insert NGD4K KCU25 Carbide

Product Description

The KENNAMETAL 5914889 is a solid carbide grooving insert in the NGD series, designed for external grooving and parting operations on CNC lathes and turning centers. This left-hand insert carries a KCU25 grade designation and features a PVD-applied AlTiN coating for improved wear resistance and heat management at the cutting edge. The insert delivers a maximum depth of cut of 0.375 inches with a 4 mm cutting width and a corner radius of 0.57 mm, making it well suited for precision groove profiles in ferrous and difficult-to-machine materials. Machinists and toolroom technicians install this type of insert during tooling setup or insert indexing routines.

This insert is intended for grooving applications where left-hand orientation is required. The NGD4K geometry with K chip breaker configuration helps manage chip flow in tight groove profiles. It is applicable to external grooving operations on steel, stainless, and similar materials in both production and job-shop environments. The insert seat size is 4, matching NGD-series toolholders designed for that seat designation. Typical use is in CNC turning operations requiring controlled chip breaking at moderate to aggressive feed rates.

Key Features

• KCU25 carbide grade with PVD AlTiN coating for elevated heat and wear resistance
• Left-hand insert orientation for specific toolholder configurations
• 4 mm cutting width with a maximum depth of cut of 0.375 inches
• Corner radius of 0.57 mm (0.0225 inches) for controlled groove geometry
• K chip breaker design for effective chip management in grooving operations
• Rake angle and internal and external relief angles all at 3 degrees for balanced cutting geometry

Compatibility

Designed as an OEM-style replacement insert for NGD-series toolholders requiring an insert seat size of 4 and left-hand cutting orientation.

Installation Notes

Insert indexing and installation should be performed by a qualified machinist or toolroom technician with the machine fully powered down and the spindle locked out per facility lockout/tagout procedures. Use the appropriate torque wrench and insert screw specified by the toolholder manufacturer to seat the insert securely. Inspect the insert pocket and clamping surfaces for chips or debris before seating the new insert. Do not exceed the maximum depth of cut rating for this insert geometry.