Kennametal 4109789 Grooving Insert KCU25 Altin Top Notch

Product Description

The KENNAMETAL 4109789 is a solid carbide grooving insert in the Top Notch series, designed for external grooving and parting operations on CNC lathes and turning centers. The insert carries a KCU25 grade with a PVD-applied AlTiN coating, delivering heat and wear resistance suited to interrupted cuts and moderate-to-hard workpiece materials. It features a right-hand cutting orientation, a 2.24 mm cutting width, and a maximum depth of cut of 2.39 mm. The 55-degree included angle and 0.19 mm corner radius make it appropriate for tight-tolerance groove profiles in production turning environments. Machinists and CNC operators working in job shops or production facilities are the primary installers of this insert type.

This insert is used in external grooving, recessing, and light parting applications on turning centers where the Top Notch clamping system is in use. It is suited for ferrous and non-ferrous materials where an AlTiN-coated carbide grade is appropriate. The 2.00 mm to 3.00 mm maximum depth-of-cut range and the 8.74 mm cutting height define the envelope of operations this insert handles. It is sold individually with a minimum order quantity of 5 units per purchase.

Key Features

• KCU25 solid carbide grade with PVD AlTiN coating for wear and heat resistance
• 2.24 mm cutting width with a maximum depth of cut of 2.39 mm
• Right-hand cutting orientation for standard external grooving setups
• 0.19 mm corner radius for controlled groove profile geometry
• Clamp-style insert holding method compatible with Top Notch toolholders
• 55-degree included angle for precise groove wall definition

Compatibility

Designed for use with Top Notch series clamping-style toolholders that accept NG3088 insert geometry. The MSC and manufacturer cross-reference number for this insert is NG3088R/L.

Installation Notes

This insert is installed by machinists or CNC operators using the clamp-style Top Notch toolholder system. Power down and lock out the machine spindle before seating or replacing inserts. Use the correct torque wrench and clamping hardware specified by the toolholder manufacturer — do not substitute fasteners. Inspect the insert pocket and clamp for chips or damage before each insert change to maintain secure seating and dimensional accuracy.