Kennametal 4109774 Grooving Insert NG4189 KCU25 Left Hand

Product Description

The KENNAMETAL 4109774 is a solid carbide grooving insert in the Top Notch series, designed for precision grooving and parting operations on CNC lathes and turning centers. It carries a PVD-applied AlTiN coating over a KCU25 carbide grade substrate, providing thermal resistance and edge hardness suited for interrupted cuts and moderate-to-high cutting speeds. The insert has a left-hand orientation with a 4.8 mm cutting width and a maximum depth of cut of 6.35 mm. A 0.57 mm corner radius reduces chipping at entry and exit. Clamped into a compatible Top Notch toolholder, this insert is a direct fit for shops running metric-dimensioned grooving applications.

This insert is intended for use in turning and grooving applications where consistent groove width and controlled chip formation are required. The NG-style insert geometry and 55-degree included angle make it well suited for external grooving on ferrous and non-ferrous materials. The AlTiN finish extends tool life in dry or semi-dry cutting conditions. It is typically installed by machinists and CNC tooling technicians in production turning environments, both job shop and production floor settings. The Top Notch series is a widely used clamping system across multiple toolholder platforms.

Key Features

• Solid carbide construction with PVD AlTiN coating for extended wear resistance
• Left-hand insert orientation for specific toolholder configurations
• 4.8 mm cutting width with a maximum depth of cut of 6.35 mm
• 0.57 mm corner radius for improved edge stability at groove entry
• 55-degree included angle with NG4189 insert geometry
• Clamp-held mounting method compatible with Top Notch series toolholders

Compatibility

Designed for use with Top Notch series clamping toolholders that accept insert seat size 4 and NG-style grooving inserts. MSC and manufacturer cross-reference number is NG4189R/L.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician with the machine powered off and the spindle locked. Seat the insert fully into the clamp pocket and verify the clamp screw is torqued according to the toolholder manufacturer specifications. Inspect the insert seat for chips or debris before seating a new insert. Do not exceed the maximum depth of cut range of 5.00 mm to 10.00 mm as specified for this insert geometry.