Kennametal 4109646 Grooving Insert KCU25 Solid Carbide Altin

Product Description

The KENNAMETAL 4109646 is a solid carbide grooving insert designed for precision external grooving and parting operations on CNC lathes and turning centers. Manufactured in the NF3125K style within Kennametal's Top Notch series, it carries a KCU25 grade designation and features a Physical Vapor Deposition (PVD) AlTiN coating for extended tool life in abrasive and interrupted-cut conditions. The insert delivers a cutting width of 3.18 mm (0.1252 inches) and a maximum depth of cut of 3.81 mm (0.15 inches), making it well suited for medium-depth grooving work. The positive rake geometry and K-style chip breaker promote controlled chip evacuation and reduced cutting forces. Machinists and toolroom professionals handling ferrous and non-ferrous turning applications are the primary installers.

This insert is intended for use in Top Notch series grooving toolholders that accept the NF3125 insert size. It is appropriate for external grooving, undercut, and light parting operations on CNC turning centers and manual lathes running at parameters consistent with carbide tooling. The right-hand orientation suits standard grooving approaches in conventional spindle setups. The insert is a metric-measurement-type part and is sold individually, though the minimum order quantity is 5 pieces per purchase.

Key Features

• KCU25 solid carbide grade with PVD AlTiN coating for heat and wear resistance
• 3.18 mm (0.1252 inch) cutting width for precise groove dimensioning
• Maximum depth of cut range of 3.00 to 4.00 mm (up to 0.15 to 0.20 inches)
• Positive 12-degree rake angle reduces cutting forces and improves chip flow
• K-style chip breaker supports controlled chip breaking in grooving operations
• Clamp-style insert holding method for rigid, repeatable seating in Top Notch toolholders

Compatibility

Designed for use with Top Notch series grooving toolholders accepting the NF3125 insert size. The MSC/Manufacturer cross-reference number for this insert is NF3125R/LK.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. The machine spindle must be fully stopped and the toolholder secured before seating or replacing the insert. Use the appropriate Kennametal Top Notch clamp screw and torque wrench per the toolholder manufacturer's documentation — do not substitute fasteners. Verify insert orientation and seating before resuming cutting operations; an improperly seated insert can cause premature edge failure or workpiece damage.