Sandvik Coromant 7859297 Turning Insert CNMG432-XM 4415

Product Description

The SANDVIK COROMANT 7859297 is a CNMG-style indexable turning insert designed for precision metal cutting on CNC lathes and turning centers. It carries the manufacturer grade 4415 with a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, delivering wear resistance and thermal stability during interrupted and continuous cuts. The insert features an 80-degree diamond shape (Insert Shape Code C), a 0.79 mm corner radius (0.0313 inches), and a 12.70 mm inscribed circle (0.5 inches). The XM chipbreaker geometry is engineered for controlled chip formation across a range of cutting conditions. This insert belongs to the T-Max P series and is intended for use by machinists and CNC operators in production turning environments.

This insert is suited for turning operations on cast iron and similar materials (Primary Workpiece Material Code K) as well as steel (Secondary Workpiece Material Code P), covering both finishing and general-purpose turning passes. The neutral hand orientation makes it compatible with standard CNMG toolholders using clamp or screw holding methods. ISO designation is CNMG 12 04 08-XM 4415. Typical applications include external turning on medium to large workpieces in job shop or high-volume production settings where consistent tool life and predictable chip control are priorities.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for enhanced wear resistance and thermal protection
• 80-degree diamond insert shape (Code C) with neutral hand for versatile toolholder compatibility
• 0.79 mm corner radius (0.0313 inches) for balanced strength and surface finish capability
• XM chipbreaker geometry with G chip configuration for controlled chip evacuation
• CNMG tolerance and clearance codes (M and N) for reliable seating and dimensional consistency
• Clamp and screw holding method compatible with standard CNMG-style toolholders

Compatibility

Designed as a direct-fit replacement for applications requiring CNMG 432 (ISO: CNMG 12 04 08) inserts in grade 4415 within the T-Max P series. Compatible with toolholders that accept CNMG-style inserts using clamp or screw holding. Suitable for primary workpiece material code K (cast iron) and secondary workpiece material code P (steel).

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torx or hex key as specified by the toolholder manufacturer when tightening the clamp or screw — do not overtighten, as this can fracture carbide. Inspect the insert seat and clamp for debris or damage before seating a new insert.