Kennametal 4109921 Grooving Insert NR4062K KCU25 Left Hand

Product Description

The KENNAMETAL 4109921 is a solid carbide grooving insert in the Top Notch series, designed for precision grooving and turning operations on CNC lathes and turning centers. It carries an AlTiN (aluminum titanium nitride) PVD coating for improved wear resistance and heat dissipation at the cutting edge. The insert delivers a 3.18 mm cutting width and a maximum depth of cut of 3.81 mm, making it suited for moderate-depth grooving passes. The NR4062K designation identifies the insert style, size, and K chip breaker geometry. This insert is installed and replaced by machinists and CNC operators working with ferrous and nonferrous workpiece materials.

The 4109921 is intended for grooving and recessing applications in production and job-shop turning environments. Its left-hand orientation determines tool holder and approach direction on the machine. The full-radius cutting edge with a 1.59 mm corner radius supports clean groove-bottom finishes. It is compatible with Top Notch series clamp-style insert holders that accept size 4 insert seats. Typical applications include external and internal grooving on turned components where tight width tolerances and controlled chip evacuation are required.

Key Features

• AlTiN PVD coating for elevated wear resistance and thermal protection at the cutting edge
• 3.18 mm cutting width with a full radius geometry for consistent groove-bottom finish
• Maximum depth of cut of 3.81 mm, with a rated depth-of-cut range of 3.00 mm to 4.00 mm
• Left-hand insert orientation for use with corresponding Top Notch holders
• K chip breaker design for controlled chip formation during grooving passes
• Clamp-style insert holding method for secure, repeatable seating in the holder

Compatibility

Designed for use with Top Notch series clamp-style toolholders that accept a size 4 insert seat. Confirm holder hand orientation and insert seat size before installation.

Installation Notes

Insert installation and replacement should be performed by a qualified machinist or CNC operator with the machine powered off and the spindle locked. Use the correct torque driver or clamp screw specified by the toolholder manufacturer to secure the insert — do not overtighten the clamp screw by hand estimation alone. Inspect the insert seat and clamp for debris or wear before seating a new insert. Verify cutting direction, insert hand, and depth-of-cut programming before resuming operation.