Kennametal 4111109 Carbide Cutoff Insert 4mm A2 KCU25

Product Description

The KENNAMETAL 4111109 is a single-end carbide cutoff insert designed for parting and grooving operations on CNC lathes and turning centers. It belongs to the A2 series and carries the KCU25 manufacturer grade with an AlTiN coating applied via PVD process. The insert delivers a 4 mm cutting width and a neutral lead angle with a 2-degree relief angle, making it well suited for general-purpose cutoff work on steel, cast iron, and similar materials. A CM chipbreaker geometry helps control chip flow during through-cuts. Licensed machinists and CNC turning specialists are the typical installers of this tooling component.

This insert is appropriate for residential shop, job shop, and production machining environments where reliable parting and cutoff performance is required on a turning center or manual lathe equipped with an A2-series insert holder. The clamp-style holding method secures the insert firmly in compatible A2 toolholders. The neutral hand orientation allows use in standard right-hand or centerline cutoff applications. It is sold individually with a minimum order quantity of 10 units per order.

Key Features

• Carbide substrate with KCU25 grade for wear resistance in cutoff and grooving applications
• AlTiN PVD coating improves heat resistance and extends tool life at higher cutting speeds
• 4 mm cutting width with 0-degree lead angle and neutral hand for straightforward parting setups
• CM chipbreaker geometry promotes controlled chip evacuation during cutoff passes
• 2-degree relief angle reduces rubbing and tool pressure at the cutting zone
• Clamp-style insert holding method for secure, repeatable seating in A2-series toolholders

Compatibility

Designed for use with A2-series clamp-style cutoff and grooving toolholders that accept a 4 mm insert seat size. Specific toolholder compatibility should be confirmed against the A2 series holder documentation prior to ordering.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician with the machine in a full stop and locked-out state before changing inserts. Use the appropriate torque wrench or clamp screw driver as specified by the toolholder manufacturer to seat the insert without over-tightening. Inspect the insert pocket and clamp for chips or debris before seating a new insert. Follow the toolholder manufacturer guidelines for feed rate and depth-of-cut recommendations specific to the KCU25 grade.