Kennametal 4109651 Grooving Insert NFD3125K KCU25 Carbide

Product Description

The KENNAMETAL 4109651 is a solid carbide grooving insert designed for precision external grooving and turning operations on CNC lathes and turning centers. It carries the KCU25 manufacturer grade and features a PVD-applied AlTiN coating for thermal resistance and extended tool life in interrupted cuts and general-purpose turning. The insert is left-hand oriented with a 3.18 mm cutting width and a maximum depth of cut of 6.35 mm. Corner radius measures 0.19 mm, and the rake angle is 12 degrees. It belongs to the Top Notch series and is held in place by a clamp-style insert holding method. Machinists and tooling specialists install this insert in compatible Top Notch grooving toolholders.

This insert is suited for grooving, profiling, and light turning applications on CNC turning centers in both production and job-shop environments. The NFD insert style with K chip breaker geometry is optimized for metric-measurement setups. The 55-degree included angle and 12-degree rake angle make it appropriate for medium-duty grooving in steel and alloy materials. The KCU25 carbide grade with AlTiN finish performs well in dry or minimal-lubrication cutting conditions. This insert is sold individually, with a minimum order quantity of 5 units per transaction.

Key Features

• Solid carbide construction with PVD AlTiN coating for heat and wear resistance
• 3.18 mm cutting width with a maximum depth of cut of 6.35 mm
• Left-hand insert orientation for correct engagement in Top Notch toolholders
• K chip breaker geometry with 12-degree rake angle for controlled chip formation
• 0.19 mm corner radius for reduced stress concentration at the groove bottom
• Clamp-type insert holding for rigid, repeatable seating in the toolholder

Compatibility

Designed for use with Top Notch series clamp-style grooving toolholders that accept NFD-style inserts in size 3125. Verify toolholder insert seat specifications before installation.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Ensure the machine spindle is fully stopped and the toolholder is secured before seating or removing the insert. Use the correct clamping screw torque as specified by the toolholder manufacturer — do not estimate. Inspect the insert seat and clamping mechanism for wear or debris before installing a new insert to ensure proper seating and cutting edge engagement.