Kennametal 4109918 Grooving Insert NR3078K KCU25 Carbide

Product Description

The KENNAMETAL 4109918 is a solid carbide grooving insert designed for precision external grooving and parting operations on CNC lathes and turning centers. It carries the KCU25 manufacturer grade and features a PVD-applied AlTiN coating for improved wear resistance and thermal stability at elevated cutting speeds. The insert is configured for right-hand cutting with a 3.96 mm cutting width and a maximum depth of cut of 3.81 mm. With a full radius corner geometry of 1.98 mm and a K-style chip breaker, it delivers controlled chip formation in a range of workpiece materials including steels and cast irons. It is installed by CNC machinists and toolroom technicians.

The 4109918 fits the Top Notch series tooling system and is suited for grooving operations on medium to high-production turning applications. The NR insert style with a 55-degree included angle and clamp-style holding method makes it compatible with standard Top Notch grooving tool holders. It is commonly used in job shops and production facilities machining ferrous and non-ferrous components where repeatable groove geometry and dimensional accuracy are required. The insert size designation is 3078 and measurement type is metric.

Key Features

• KCU25 carbide grade with PVD AlTiN coating for extended tool life in steel and cast iron grooving
• 3.96 mm cutting width with full corner radius of 1.98 mm for consistent groove geometry
• Maximum depth of cut range of 3.00 to 4.00 mm, nominal 3.81 mm
• K-style chip breaker promotes controlled chip evacuation and reduces chip packing in deep grooves
• Clamp-style insert holding method provides rigid, repeatable seating in Top Notch holders
• Right-hand cutting orientation; single-use insert — not a multi-use tool

Compatibility

Designed for use with Top Notch series grooving tool holders that accept NR-style inserts with a 3078 insert size designation. The MSC and manufacturer cross-reference number is NR3078R/LK.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Power down and lock out the machine spindle before seating or removing the insert. Seat the insert fully against the pocket locating surfaces and secure the clamp fastener to the tool holder manufacturer's specified procedure using calibrated tooling. Verify insert orientation and cutting edge clearance before resuming cutting operations.