Kennametal 5591799 Turning Insert CNMG643MP KCM25B Carbide

Product Description

The KENNAMETAL 5591799 is a CNMG643MP indexable turning insert in grade KCM25B, designed for steel and stainless steel turning operations where toughness and moderate wear resistance are priorities. The insert features a multilayer CVD coating consisting of TiCN, Al2O3, and TiOCN applied by MTCVD process, delivering thermal and abrasion protection during continuous and interrupted cuts. With an 80-degree diamond (rhombic) shape, negative rake, and neutral hand, it fits standard KENLOC-style toolholders and is suited for roughing and medium machining passes. Four cutting edges extend tool life per insert.

This insert is intended for use in CNC turning centers and conventional lathes performing turning, facing, and boring operations. Primary workpiece materials include steel, stainless steel, superalloys, and titanium. The MP chip breaker geometry is optimized for roughing and medium material removal rates, making it a practical choice for production shops running P- and M-grade workpiece materials. Licensed machinists and CNC operators in job shops, aerospace, and general manufacturing environments are the typical installers and users of this insert series.

Key Features

• CNMG643MP geometry with 80-degree diamond shape and negative rake for stable, rigid cutting
• KCM25B grade with multilayer CVD TiCN/Al2O3/TiOCN coating for high toughness in steel and stainless steel
• MP chip breaker optimized for roughing and medium machining applications
• 4 cutting edges per insert reduce per-edge tooling cost
• Neutral hand orientation for use in left- or right-hand toolholder setups
• Compatible with clamp and pin insert holding methods per KENLOC series design

Compatibility

Designed for use in KENLOC-series toolholders accepting CNMG643 (ISO CNMG190612) negative-rake inserts. Compatible with clamp and pin holding methods. Verified by ANSI and ISO standards. Refer to KENNAMETAL toolholder documentation to confirm seating and clamping compatibility before use.

Installation Notes

Insert replacement and indexing should be performed by a qualified machinist or CNC toolroom technician with the spindle at a full stop and machine in a locked-out, tagged-out state. Use the appropriate torque wrench and seating pin for KENLOC-style clamp systems — follow the toolholder manufacturer torque specifications for the clamping screw. Inspect the insert pocket and clamping surfaces for chips or wear before seating a new insert. Never run a chipped or cracked insert.