Kennametal 4109657 Grooving Insert NFD4189K KCU25 Left Hand

Product Description

The KENNAMETAL 4109657 is a solid carbide grooving insert in the Top Notch series, designed for external grooving and cutoff operations on CNC lathes and turning centers. The insert carries the NFD4189K geometry with a KCU25 grade, which combines a PVD-applied AlTiN coating with a carbide substrate suited for demanding interrupted cuts and a variety of workpiece materials. It is sized for a 4.8 mm cutting width with a maximum depth of cut of 9.53 mm and a cutting height of 11.51 mm. A 0.57 mm corner radius and 12-degree rake angle contribute to controlled chip formation. Machinists and CNC operators performing precision grooving work install this insert as part of a clamp-style Top Notch toolholder system.

This insert is intended for use in industrial machining environments where metric-dimensioned grooving is required. The left-hand orientation suits specific toolholder setups on turning centers where the insert approaches from the left. The K chip breaker geometry is appropriate for finish to medium grooving passes. The insert seat size is 4, consistent with standard Top Notch compatible clamp holders. It is not configured as a full-radius insert and is not a multi-use tool, making it purpose-built for dedicated grooving applications in production or job-shop settings.

Key Features

• Solid carbide construction with PVD AlTiN coating for extended tool life in abrasive and hard materials
• 4.8 mm cutting width with a maximum depth of cut of 9.53 mm
• Left-hand insert orientation for use with compatible left-hand Top Notch clamp holders
• K chip breaker geometry with a 12-degree rake angle for controlled chip evacuation
• 0.57 mm corner radius for defined groove edge geometry
• Clamp-style insert holding method for secure, repeatable seating

Compatibility

Designed for use with Top Notch series clamp-style toolholders accepting insert seat size 4 and accommodating a 4189 insert size in left-hand orientation.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician with the machine powered off and the spindle locked. Seat the insert fully into the Top Notch holder pocket and tighten the clamp screw to the toolholder manufacturer's specification before any cutting operation. Inspect the insert seat and clamp for chips or debris before seating to ensure full contact. Never exceed the stated maximum depth of cut range for this insert size.