Kennametal 4109850 Grooving Insert KCU25 Solid Carbide

Product Description

The KENNAMETAL 4109850 is a solid carbide grooving insert designed for precision external grooving and parting operations on CNC lathes and turning centers. Built to the Top Notch series standard, this insert features an AlTiN (aluminum titanium nitride) coating applied via PVD process, which delivers enhanced heat resistance and wear performance in demanding cutting conditions. The left-hand orientation, 4.80 mm cutting width, and 6.35 mm maximum depth of cut make it well suited for controlled grooving passes where dimensional accuracy is critical. It is installed and used by machinists and toolroom professionals working in production turning environments.

This insert is intended for use in Top Notch series toolholders that accept the NGD-style clamp-mount insert. The left-hand configuration suits applications where the tool approaches the workpiece from the right side of the turret. Typical use cases include external groove profiling, undercut operations, and part-off sequences on bar-fed or chucked workpieces in ferrous and non-ferrous materials. The KCU25 grade is formulated for a broad range of workpiece materials, making this insert a practical choice across general-purpose turning applications.

Key Features

• Solid carbide construction with PVD-applied AlTiN coating for extended tool life
• 4.80 mm cutting width with a 0.57 mm corner radius for controlled groove geometry
• 6.35 mm maximum depth of cut supports deep grooving within the 5.00 to 10.00 mm depth range
• Left-hand insert hand for right-to-left grooving approach
• K-style chip breaker geometry promotes chip control during grooving passes
• Clamp-style insert holding method ensures rigid, repeatable seating in the toolholder

Compatibility

Designed for use with Top Notch series toolholders accepting NGD-style inserts with clamp-type retention. Confirm holder geometry and insert pocket dimensions against the NGD3189 insert specification before installation.

Installation Notes

Installation of grooving inserts should be performed with the machine spindle stopped and all motion axes locked. Seat the insert fully into the toolholder pocket and verify clamp torque using the toolholder manufacturer's recommended procedure. Inspect the insert seat and clamp for debris or wear before each insert change. Do not exceed the maximum depth of cut rating for the insert or the toolholder to avoid insert fracture or toolholder damage.