Kennametal 3781281 Grooving Insert KCU10 Altin 4mm

Product Description

The KENNAMETAL 3781281 is a solid carbide grooving insert designed for precision groove turning and parting operations on CNC lathes and turning centers. Manufactured to the A4 series standard, this insert carries the KCU10 grade designation and features an AlTiN coating applied via PVD process, delivering thermal resistance and extended tool life in a wide range of workpiece materials including steel and cast iron. The neutral hand orientation and GUP chip breaker geometry support consistent chip control and surface finish at the cutting zone. A 4.00 mm cutting width and a maximum depth of cut of 3.30 mm make this insert well suited for shallow to mid-depth grooving work where dimensional accuracy is critical.

This insert is intended for use in industrial turning applications where repeatable grooving performance is required. The A4G insert style is a common format found on grooving toolholders used in both light and medium-duty turning operations. It is typically installed by machinists and CNC operators in job shop and production environments. The positive rake geometry reduces cutting forces, making it appropriate for finishing cuts on medium-hardness materials classified under material grades C3 and C4.

Key Features

• KCU10 solid carbide grade with AlTiN PVD coating for thermal and wear resistance
• 4.00 mm cutting width with a maximum depth of cut of 3.30 mm
• GUP chip breaker for positive rake geometry and controlled chip evacuation
• Corner radius of 0.40 mm for controlled edge blending at groove walls
• Neutral hand insert style compatible with standard A4G-format toolholders
• Overall length of 0.7874 inches for consistent seating in matching insert pockets

Compatibility

Designed as a direct-fit replacement insert for A4 series grooving toolholders accepting the A4G insert style with a size 4 insert seat. Verify toolholder insert seat dimensions before installation.

Installation Notes

Installation of grooving inserts should be performed by a qualified machinist with the machine in a powered-off and locked-out state per applicable lockout/tagout procedures. Inspect the insert seat and clamping screw for wear or debris before seating the insert. Use the appropriate torque driver for the clamping screw — refer to the toolholder manufacturer specifications for correct fastener torque. Do not exceed the rated maximum depth of cut for this insert to avoid insert fracture or premature edge failure.