Kennametal 4109776 Grooving Insert NG4189 KCU25 Carbide

Product Description

The KENNAMETAL 4109776 is a solid carbide grooving insert in the Top Notch series, designed for external grooving and turning operations on CNC lathes and turning centers. It carries a KCU25 manufacturer grade with an AlTiN coating applied via PVD process, delivering elevated heat resistance and edge wear performance in steel and cast iron applications. The insert provides a 4.80 mm cutting width and a maximum depth of cut of 6.35 mm, with a corner radius of 0.57 mm. It is a right-hand insert configured for clamp-style toolholders and is sized to the Top Notch NG4189 seat. Machinists and toolroom technicians working with metric setups will find this insert suited to medium-duty grooving at standard lathe cutting parameters.

This insert fits residential and commercial machine shop environments as well as production turning lines wherever the Top Notch NG4189 toolholder platform is in use. Typical applications include external grooving, face grooving lead-ins, and undercut operations on ferrous and non-ferrous workpieces. The KCU25 carbide grade with AlTiN finish is well-suited for interrupted cuts and moderate chip loads. The insert is sold individually but carries a minimum order quantity of 5 units, making it appropriate for tool crib stocking or small-batch replenishment programs.

Key Features

• Solid carbide construction with PVD-applied AlTiN coating for extended tool life in ferrous materials
• 4.80 mm cutting width with a maximum depth of cut range of 5.00 mm to 10.00 mm
• 0.57 mm corner radius for controlled chip formation in precision grooving
• Right-hand orientation, clamp-style holding method compatible with Top Notch NG seat toolholders
• 55-degree included angle geometry for stable, low-vibration grooving cuts
• KCU25 grade rated for material grades C2 and C6 workpiece categories

Compatibility

Designed for use with Top Notch series clamp-style toolholders accepting an NG4189 insert seat size 4. The MSC/Manufacturer cross-reference number is NG4189R/L.

Installation Notes

This insert is installed by a machinist or toolroom technician using the appropriate Top Notch clamp and toolholder assembly. Before indexing or replacing the insert, confirm the machine spindle is stopped and all axis motion is locked out per shop lockout/tagout procedures. Seat the insert firmly against the toolholder pocket and verify clamp engagement before resuming cuts. Do not exceed the stated maximum depth of cut range, as overloading a grooving insert can cause sudden fracture.