Kennametal 5640978 Turning Insert CNMG432UP KCM15B Carbide

Product Description

The KENNAMETAL 5640978 is a CNMG432UP grade KCM15B solid carbide turning insert designed for high-productivity metal removal in demanding turning, facing, and boring operations. The insert features a multilayer MTCVD-applied TiCN and Al2O3 coating that delivers a balance of wear resistance and toughness suited to interrupted and continuous cuts. The 80-degree diamond (rhombic) shape provides two usable cutting edges per face for a total of four cutting edges per insert. A honed cutting edge and negative rake geometry reduce chipping risk during roughing and medium machining passes. Chip breaker style UP is optimized for steel and stainless steel workpiece materials.

This insert is intended for turning, facing, and boring operations on steel, stainless steel, superalloys, and titanium. Grade KCM15B targets ISO material groups P and M, making it a practical choice for job shops and production environments that machine a range of ferrous and difficult-to-machine alloys. The UP chip breaker geometry handles roughing through medium machining chip loads, helping manage chip flow across variable feed and depth-of-cut conditions. It seats in KENLOC-style toolholders that accept clamp and pin holding methods with negative side clearance.

Key Features

• Multilayer MTCVD coating: TiCN plus Al2O3 for combined wear resistance and toughness on P and M workpiece materials
• 80-degree diamond insert shape with 4 total cutting edges maximizes insert utilization
• UP chip breaker geometry suited for roughing and medium machining chip loads
• Honed cutting edge style reduces micro-chipping on interrupted cuts and scale entry
• Negative rake and negative side clearance (N clearance) for increased edge strength
• Multi-use insert supports turning, facing, and boring from a single pocket configuration

Compatibility

Designed for KENLOC-style toolholders accepting CNMG432 (ISO CNMG120408) inserts with clamp and pin holding methods. Industry standard number CNMG432UP and ISO code CNMG120408UP confirm fitment in any toolholder specifying that pocket geometry and negative side clearance. Conforms to ANSI and ISO insert standards.

Installation Notes

Installation is performed by a machinist or toolroom technician familiar with indexable insert toolholders. Power down and lock out the machine spindle before indexing or replacing inserts. Ensure the insert pocket seat and shim are clean and free of chips before seating the insert, as debris under the insert can cause premature edge failure or toolholder damage. Follow the toolholder manufacturer's clamp torque specifications and do not exceed the maximum depth of cut listed for the insert geometry.