Kennametal 1113840 Grooving Insert NR4094 KC850 Carbide

Product Description

The KENNAMETAL 1113840 is a solid carbide grooving insert in the Top Notch series, designed for precision external grooving and turning operations on CNC lathes and turning centers. The insert carries a CVD-applied multilayer coating of TiC, TiCN, and TiN, which provides wear resistance and thermal stability during continuous or interrupted cutting. It features a 4.78 mm cutting width and a maximum depth of cut of 6.35 mm, with a full corner radius of 2.39 mm and a neutral rake geometry. The KC850 grade targets ISO material groups C5 and C6, making it appropriate for machining cast irons and steels at moderate to high cutting speeds. Installed by machinists and toolroom technicians, this insert seats into compatible Top Notch toolholders.

This insert is suited for left-hand grooving applications on horizontal and slant-bed CNC lathes. The NR insert style and size 4094 geometry fit within the Top Notch toolholder system, which is commonly used in production and job-shop environments for part-off, groove, and turning operations. The neutral rake face supports consistent chip control across a range of feed rates. Typical applications include groove forming on shafts, bushings, and similar turned components in steel and cast iron workpiece materials.

Key Features

• CVD multilayer coating: TiC, TiCN, and TiN for extended tool life in steel and cast iron
• 4.78 mm cutting width with full corner radius of 2.39 mm for consistent groove geometry
• Maximum depth of cut of 6.35 mm suitable for moderate-depth groove profiles
• Left-hand orientation for specific toolholder and approach configurations
• Neutral rake geometry supports stable chip formation across varying feed rates
• Top Notch series insert seat size 4 for compatibility with the Top Notch toolholder platform

Compatibility

Designed for use with Top Notch series toolholders accepting insert seat size 4 and NR-style inserts in the 4094 size. Compatible with KC850 grade applications in ISO material groups C5 and C6.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before seating the insert, ensure the machine spindle is fully stopped and the toolholder pocket is clean and free of chips or debris. Verify insert orientation matches the left-hand designation of the toolholder before tightening the clamping screw to the toolholder manufacturer's specified procedure. Handle solid carbide inserts carefully to avoid chipping the cutting edge.