Kennametal 4109681 Grooving Insert NG2125 KCU25 Carbide

Product Description

The KENNAMETAL 4109681 is a solid carbide grooving insert in the Top Notch series, designed for precision grooving and parting operations on CNC lathes and turning centers. Built to the NG2125 insert style with a KCU25 grade and PVD-applied AlTiN coating, this insert delivers reliable wear resistance and thermal stability in demanding interrupted-cut and high-speed turning applications. The left-hand configuration provides a 3.18 mm cutting width and a maximum depth of cut of 2.79 mm. The 55-degree included angle and 0.19 mm corner radius support controlled chip formation in metalcutting environments where dimensional consistency is critical. Installed by machinists and CNC setup technicians across job shops and production facilities.

This insert is suited for metric-dimensioned grooving applications on ferrous and non-ferrous workpieces where a left-hand cutting orientation is required. The Top Notch series uses a clamp-style insert holding method, making it compatible with Top Notch toolholders designed for NG-style inserts. Typical applications include external grooving, undercut profiling, and light parting on small-diameter workpieces. The AlTiN PVD coating extends tool life in dry and semi-dry cutting conditions, reducing the need for coolant in many operations.

Key Features

• Solid carbide substrate with KCU25 manufacturer grade for toughness and edge retention
• PVD AlTiN coating for high-temperature wear resistance in dry or semi-dry cutting
• Left-hand cutting orientation with 3.18 mm cutting width
• Maximum depth of cut 2.79 mm, rated for the 2.00 to 3.00 mm depth-of-cut range
• 0.19 mm corner radius for controlled workpiece surface finish
• Clamp-style retention compatible with Top Notch series toolholding systems

Compatibility

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

Installation Notes

This insert is installed by qualified machinists or CNC tooling technicians. Before changing inserts, power down the machine spindle and engage all axis locks per standard lockout/tagout procedures. Seat the insert fully in the toolholder pocket before tightening the clamp to ensure proper cutting geometry and edge presentation. Inspect the toolholder pocket for wear or debris before each insert change to avoid seating errors.