Kennametal 4109648 Grooving Insert KCU25 3.96mm Top Notch

Product Description

The KENNAMETAL 4109648 is a solid carbide grooving insert in the Top Notch series, designed for external grooving and turning operations on CNC and manual lathes. Manufactured to insert style NF with a KCU25 grade carbide substrate, it features a physical vapor deposition (PVD)-applied AlTiN coating for extended tool life in steel, stainless, and high-temperature alloy applications. The cutting width is 3.96 mm (0.1559 inches) with a maximum depth of cut of 3.81 mm (0.1500 inches). A 12-degree rake angle and K-style chip breaker support controlled chip formation during moderate to aggressive grooving passes. This insert is installed by machinists and CNC operators in production and job-shop environments.

The 4109648 fits Right Hand toolholders in the Top Notch series and is suited for metric-measurement setups. Typical applications include external grooving, undercuts, and profile turning on turning centers and engine lathes. The 0.19 mm corner radius (0.0075 inches) makes it appropriate for general-purpose grooving where a near-sharp corner is required without a full radius profile. It is sold individually but subject to a minimum order quantity of 5 units per purchase.

Key Features

• KCU25 solid carbide grade with PVD AlTiN coating for wear resistance in steel and alloy applications
• 3.96 mm cutting width with a maximum depth of cut range of 3.00 to 4.00 mm
• K chip breaker geometry with 12-degree rake angle for controlled chip evacuation
• Right Hand orientation, clamp-style insert holding method
• 0.19 mm corner radius — no full radius — for precise groove profile control
• Top Notch series compatibility for straightforward toolholder indexing

Compatibility

Designed for use in Right Hand Top Notch series grooving toolholders that accept NF-style inserts with an insert size designation of 3156. Verify toolholder and clamp compatibility before installation.

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Power down and lock out the machine spindle before seating or indexing the insert. Use the appropriate Top Notch clamp and torque the clamping screw to the toolholder manufacturer's specification — do not over-torque or substitute non-OEM clamps. Inspect the insert seat and clamp for chips or debris before each use to ensure proper seating and repeatable tool height.