Kennametal 5591976 DNMG432RP KCM25B Carbide Turning Insert

Product Description

The KENNAMETAL 5591976 is a DNMG432RP solid carbide turning insert in grade KCM25B, designed for external and internal turning operations on CNC lathes and turning centers. It features a 55-degree diamond (rhombic) insert shape with a negative rake angle and negative side clearance, giving it strong edge support for interrupted cuts and tough materials. The multilayer MTCVD coating stack — TiCN, Al2O3, and TiOCN — delivers the wear resistance and toughness needed for steel and stainless steel applications. The KCM25B grade is rated for high toughness on steel (P) and moderate wear-resistance with toughness on stainless steel (M). Licensed machinists, CNC operators, and toolroom technicians are the primary users.

This insert is suited for roughing and medium machining passes on steel, stainless steel, superalloys, and titanium. It fits KENLOC-style toolholders that accept DNMG-style inserts held by clamp or pin. Typical applications include turning, facing, boring, back turning, and back boring. The four available cutting edges make it a cost-effective choice for high-volume production turning where edge life on tough and abrasive workpiece materials is the primary concern.

Key Features

• DNMG432RP geometry with chamfered and honed cutting edge style for controlled entry into roughing cuts
• KCM25B grade with MTCVD multilayer coating (TiCN / Al2O3 / TiOCN) for toughness and wear resistance
• 55-degree diamond insert shape with negative rake and negative side clearance for strong edge support
• Four cutting edges per insert for extended tool economy
• RP chip breaker rated for roughing and medium machining operations
• Compatible with clamp and pin insert holding methods on KENLOC-style toolholders

Compatibility

Designed for use in KENLOC-series toolholders accepting DNMG-style inserts (ANSI code DNMG432, ISO code DNMG150408) with clamp or pin holding. Suited for steel, stainless steel, superalloys, and titanium workpiece materials.

Installation Notes

Installation is performed by qualified machinists or CNC toolroom technicians. Power down the machine and lock out the spindle before seating or indexing inserts. Use the correct torque wrench for the clamp screw per the toolholder manufacturer's specification — do not use impact tools on insert clamp hardware. Inspect the insert pocket and locating pin for debris or wear before seating a new edge.