Kennametal 4109903 Grooving Insert NR2M050 KCU25 1mm

Product Description

The KENNAMETAL 4109903 is a solid carbide grooving insert in the Top Notch series, designed for precision grooving and parting operations on CNC lathes and turning centers. Manufactured from carbide grade KCU25 with a PVD-applied AlTiN coating, this insert delivers thermal resistance and edge hardness suited for interrupted cuts and abrasive workpiece materials. The left-hand orientation and 1.00 mm cutting width make it appropriate for tight, narrow groove profiles where dimensional accuracy is critical. Cutting height measures 5.56 mm, and the full corner radius of 0.50 mm contributes to consistent surface finish at groove edges. This insert is installed and indexed by licensed machinists and CNC operators working in production turning environments.

The 4109903 is sized for metric grooving applications requiring a maximum depth of cut up to 1.27 mm. It fits within the Top Notch clamping system, which uses a clamp-style insert holding method for secure seating under cutting loads. Typical applications include external grooving, undercut profiling, and finish turning of small-diameter features on metal workpieces. The KCU25 carbide grade is formulated for performance across a range of ferrous and non-ferrous materials. This insert is sold individually and carries a minimum order quantity of 5 units per order.

Key Features

• Solid carbide construction with KCU25 grade for strength and wear resistance
• PVD AlTiN coating for elevated thermal protection and reduced edge wear
• 1.00 mm cutting width for narrow, precise groove profiles
• Full corner radius of 0.50 mm for consistent groove edge geometry
• Left-hand insert orientation for specific toolholder compatibility
• Clamp-style holding method within the Top Notch toolholder system
• Maximum depth of cut of 1.27 mm suits shallow grooving and undercut work

Compatibility

Designed for use with Top Notch series clamping toolholders that accept the NR insert style in size 2M050. Verify toolholder hand and insert pocket geometry before installation.

Installation Notes

Insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer torque and clamping procedures. Power down and lock out the machine spindle before indexing or replacing inserts. Inspect the insert pocket and clamping screw for damage or debris before seating a new insert. Do not exceed the rated maximum depth of cut or feed rate specified in the cutting data for grade KCU25.