Kennametal 3871116 Grooving Insert KCU25 3mm Carbide

Product Description

The KENNAMETAL 3871116 is a solid carbide grooving insert designed for precision external grooving and parting operations on CNC lathes and turning centers. Manufactured to the R0300GMP geometry in the A4 series, this insert features an AlTiN coating applied via PVD process, delivering enhanced wear resistance and thermal stability at the cutting edge. The insert carries a 3.00 mm cutting width and a maximum depth of cut of 2.51 mm, making it well suited for shallow-to-medium grooving passes in a range of workpiece materials. The KCU25 grade carbide provides a balance of toughness and hardness appropriate for interrupted cuts and general turning applications. Installation requires a compatible KENNAMETAL A4-series grooving toolholder.

This insert is used in metalworking production environments where consistent, repeatable groove geometry is required. It is appropriate for machining steel, alloy steel, and similar materials in both job shop and production settings. The neutral hand configuration allows use without directional restriction in grooving applications. The full-radius corner geometry (1.50 mm corner radius) produces a smooth groove bottom profile. Machinists and CNC operators working in precision turning departments will find this insert fits standard A4-series grooving systems.

Key Features

• Solid carbide KCU25 grade with AlTiN PVD coating for wear and heat resistance
• 3.00 mm cutting width with a maximum depth of cut of 2.51 mm
• Full-radius corner at 1.50 mm for smooth groove bottom finish
• Neutral hand — no directional restriction for grooving operations
• GMP chip breaker geometry for controlled chip evacuation
• Multi-use tool designation supports varied grooving and parting applications
• Series A4 insert size 0300 for use with compatible KENNAMETAL toolholders

Compatibility

Designed for use with KENNAMETAL A4-series grooving toolholders accepting size 0300 inserts. Manufacturer catalog reference: A4R0300M3SP00GMP.

Installation Notes

This insert is installed and replaced by a qualified machinist or CNC operator following the machine tool builder lockout/tagout procedures before any tooling change. Seat the insert fully into the toolholder pocket and torque the clamping screw according to the toolholder manufacturer specifications. Inspect the insert pocket for chips or debris before seating to avoid seating errors that can damage the insert or holder. Verify correct insert orientation and cutting edge condition before resuming machine operation.