Kennametal 4109779 Grooving Insert NG4250 KCU25 Carbide Altin

Product Description

The KENNAMETAL 4109779 is a solid carbide grooving insert designed for the Top Notch series of grooving toolholders. It features an AlTiN (aluminum titanium nitride) PVD coating that improves wear resistance and extends tool life in demanding turning operations. With a 0.25 inch cutting width and a maximum depth of cut of 0.25 inches, this insert is suited for precision grooving work on ferrous and non-ferrous materials. The KCU25 grade designation indicates a tough carbide substrate optimized for interrupted cuts and challenging workpiece materials. Installation and setup is handled by machinists and CNC lathe operators working in production or job-shop environments.

This insert is intended for use in Top Notch series grooving toolholders accepting an insert seat size 4. The left-hand orientation determines proper toolholder compatibility and direction of cut. It is applicable in external grooving operations on CNC lathes and manual turning centers across light to medium-duty production runs. The neutral rake angle and 55-degree included angle support stable cutting geometry during the grooving pass. The 0.045 inch corner radius helps reduce stress concentration at the groove bottom.

Key Features

• Solid carbide construction with PVD-applied AlTiN coating for enhanced wear resistance
• 0.25 inch cutting width for precise groove sizing
• Maximum depth of cut range of 0.20 to 0.30 inches
• Left-hand insert orientation for correct toolholder pairing
• Top Notch series, insert seat size 4 compatibility
• Neutral rake angle and 0-degree lead angle for stable grooving geometry

Compatibility

Designed for use with Top Notch series grooving toolholders accepting seat size 4 inserts; MSC and manufacturer cross-reference number NG4250R/L confirms left-hand fitment.

Installation Notes

This insert is installed and replaced by machinists or CNC lathe operators. Power down and lock out the machine before seating or removing inserts. Use the appropriate Top Notch insert clamp and torx or hex key as specified by the toolholder manufacturer. Inspect the insert seat for chips or debris before seating the new insert to ensure proper contact and prevent premature breakage.