Kennametal 4109781 Grooving Insert 0.25 Inch KCU25 Carbide

Product Description

The KENNAMETAL 4109781 is a solid carbide grooving insert in the Top Notch series, designed for external grooving and parting operations on CNC turning centers and lathes. It carries an AlTiN coating applied by PVD process, which extends tool life in moderate-to-high speed applications involving steel and cast iron. The insert features a 0.25 inch (6.35 mm) cutting width, a maximum depth of cut of 0.25 inches (6.35 mm), and a corner radius of 0.0225 inches (0.57 mm). It is configured for right-hand cutting and uses a clamp-style insert holding method. Grade KCU25 is a general-purpose uncoated-substrate carbide grade suited for interrupted cuts and tough workpiece materials.

This insert is intended for use in production and job-shop turning environments, covering both residential-scale machine shops and industrial production floors. It fits Top Notch series grooving toolholders that accept NG-style inserts at insert seat size 4. The 55-degree included angle geometry and 11.51 mm cutting height support stable clamping in standard Top Notch blocks. Machinists and CNC operators performing grooving, undercutting, or parting tasks on ferrous and non-ferrous workpieces will find this insert suited to those applications.

Key Features

• Solid carbide substrate with PVD-applied AlTiN coating for extended tool life in tough cuts
• 0.25 inch (6.35 mm) cutting width and 0.25 inch (6.35 mm) maximum depth of cut
• Corner radius of 0.0225 inches (0.57 mm) for controlled groove geometry
• Right-hand cutting orientation, clamp-style insert holding
• Insert style NG, Top Notch series, insert seat size 4
• 55-degree included angle with 11.51 mm cutting height

Compatibility

Designed for use in Top Notch series grooving toolholders that accept NG-style inserts at insert seat size 4, as referenced by MSC/Manufacturer Number NG4250R/L.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before seating or removing the insert. Use the appropriate clamping hardware for the Top Notch toolholder to secure the insert fully before resuming cuts. Inspect the insert seat for chips or debris before installation to ensure proper seating and prevent premature insert failure.