Kennametal 4109683 Grooving Insert NG2125 KCU25 Carbide Altin

Product Description

The KENNAMETAL 4109683 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 KCU25 manufacturer grade with a PVD-applied AlTiN coating, delivering thermal resistance and extended tool life in demanding cutting conditions. The insert features a 3.18 mm cutting width and a maximum depth of cut of 2.79 mm, making it well suited for shallow-to-medium groove profiles. Right-hand orientation and a clamp-style holding method allow secure, repeatable seating in compatible Top Notch toolholders. Material grades C2 and C6 reflect its suitability across a range of ferrous and non-ferrous workpiece materials.

This insert is used in production turning environments where consistent groove geometry and surface finish are required. Typical applications include external grooving, undercut operations, and parting on small-to-medium diameter workpieces. The 55-degree included angle and 0.19 mm corner radius support controlled chip formation in both roughing and finishing passes. It is used by CNC machinists and toolroom operators in job shops, aerospace, automotive, and general manufacturing settings.

Key Features

• KCU25 carbide grade with PVD AlTiN coating for elevated heat resistance and wear performance
• 3.18 mm cutting width with a maximum depth of cut range of 2.00 to 3.00 mm
• Right-hand insert orientation for standard external grooving setups
• Clamp-style holding method ensures rigid, positive insert location in Top Notch toolholders
• 0.19 mm corner radius and 55-degree included angle for precise groove geometry
• Full-radius designation: No — suitable for flat-bottomed groove profiles

Compatibility

Designed for use in Top Notch series grooving toolholders that accept NG-style inserts. The MSC and manufacturer cross-reference number for this insert is NG2125R/L.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician with the machine spindle fully stopped and the machine in a locked-out, de-energized state. Seat the insert firmly in the Top Notch clamp holder before torquing the clamp screw — do not force the insert or use impact tools on the clamping hardware. Inspect the insert pocket for chips or debris before seating a new insert, as contamination will affect cutting geometry and surface finish. Always verify insert orientation matches the programmed tool path before resuming operations.