Kennametal 5591991 Turning Insert CNMG433UP KCM25B Carbide

Product Description

The KENNAMETAL 5591991 is a CNMG433UP turning insert in the KCM25B grade, designed for indexable tooling applications in CNC turning centers and lathes. Manufactured from solid carbide with a multilayer CVD coating — TiCN, Al2O3, and TiOCN — this insert delivers a balance of high toughness and moderate wear resistance suited for steel and stainless steel machining. The 80-degree diamond (rhombic) insert geometry with a negative rake angle and honed cutting edge style promotes stability during roughing and medium machining passes. With four usable cutting edges per insert, it offers extended tooling value per piece. Licensed machinists and CNC operators working in precision metalworking and job shop environments will find this insert compatible with standard KENLOC clamp-and-pin toolholders.

This insert is intended for turning, facing, and boring operations on primary workpiece materials including steel, stainless steel, superalloys, and titanium. The UP chip breaker geometry is optimized for roughing and medium machining, making it a practical choice for interrupted cuts and variable stock conditions. The neutral hand orientation means it can be used in both right- and left-hand toolholder configurations where the insert shape is compatible. Shops processing P- and M-category materials per ISO workpiece classification will find this insert well matched to those cutting conditions.

Key Features

• Solid carbide substrate with multilayer CVD coating: TiCN, Al2O3, and TiOCN for high toughness in steel and stainless steel
• 80-degree diamond (rhombic) insert shape with negative rake angle for stable, rigid cutting
• UP chip breaker geometry rated for roughing and medium machining operations
• Four cutting edges per insert for maximum index utilization
• Honed cutting edge style reduces micro-chipping at entry and exit
• Neutral hand orientation compatible with standard clamp and pin KENLOC toolholders
• Conforms to ANSI insert code CNMG433 and ISO insert code CNMG120412

Compatibility

Designed for use with KENLOC-series indexable toolholders that accept CNMG-style inserts with clamp and pin holding methods. Compatible with ANSI designation CNMG433 and ISO designation CNMG120412 toolholder pockets. Suitable for turning, facing, and boring applications on steel, stainless steel, superalloys, and titanium workpiece materials.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Ensure the machine spindle is fully stopped and locked out before indexing or replacing inserts. Seat the insert fully in the toolholder pocket before engaging the clamp or pin, and verify the insert is flush with no rocking before taking a cut. Always verify correct toolholder pocket geometry matches CNMG433 or CNMG120412 specifications before installation.