Kennametal 3751945 CNMG431FN KCK05 Turning Insert Carbide

Product Description

The KENNAMETAL 3751945 is a solid carbide turning insert in the CNMG431FN geometry, grade KCK05, designed for high-wear-resistance machining of steel and cast iron. It carries a multilayer CVD coating of TiCN and Al2O3 applied by MTCVD process, delivering thermal resistance and edge retention in finishing operations. The insert measures 12.90 mm in length with a 0.5 inch inscribed circle and a 1/64 inch corner radius. It features a negative rake angle of 10 degrees, a honed cutting edge, and four usable cutting edges. Licensed machinists, CNC operators, and toolroom technicians install this insert in KENLOC-compatible toolholders for production turning, facing, and boring applications.

This insert is suited for finishing cuts on steel and cast iron workpieces in both CNC turning centers and manual lathes equipped with compatible KENLOC-series toolholders. The FN chip breaker geometry is optimized for finishing operations where controlled chip flow and consistent surface finish are required. The maximum depth of cut is 1.25 mm (0.0492 inches), confirming its role as a light-engagement finishing insert. It is classified under ANSI insert code CNMG431 and ISO insert code CNMG120404, making it straightforward to cross-reference against standard toolholder catalogs. The insert is compatible with both clamp and pin holding methods, adding flexibility in toolholder selection.

Key Features

• KCK05 grade with multilayer CVD TiCN and Al2O3 coating for high wear resistance on steel (P) and cast iron (K) workpiece materials
• FN chip breaker geometry engineered for finishing operations with controlled chip evacuation
• Four usable cutting edges per insert for extended tool life and cost efficiency
• Negative rake, negative side clearance (N clearance code) geometry for stable clamping in KENLOC toolholders
• Honed cutting edge style reduces micro-chipping during light finishing passes
• Compatible with clamp and pin insert-holding methods for broad toolholder compatibility

Compatibility

Designed for use in KENLOC-series toolholders accepting CNMG431 (ISO CNMG120404) insert geometry with clamp or pin holding. Suitable for turning, facing, and boring applications on steel and cast iron workpieces.

Installation Notes

This insert is installed by a qualified machinist or CNC toolroom technician. Power down and lock out the machine spindle before changing inserts. Use the correct torx or insert-clamp screw driver as specified by the toolholder manufacturer - do not overtighten the clamp, as this can fracture the carbide substrate. Inspect the toolholder pocket and locating pin for wear or debris before seating the insert, and verify that the insert is fully seated before resuming cuts.