Sandvik Coromant 7859198 Turning Insert CNMG431-PF 4415

Product Description

The SANDVIK COROMANT 7859198 is a CNMG-style indexable turning insert from the T-Max P series, designed for external and internal turning operations on CNC lathes. The insert is manufactured from solid carbide and features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides thermal resistance and flank wear protection during continuous and interrupted cuts. It carries an 80-degree diamond shape (CNMG), a neutral hand orientation, a 0.40 mm corner radius, and a 12.70 mm inscribed circle. With four cutting edges per insert and a PF chip breaker geometry, it delivers reliable chip control in medium to finish turning applications. Licensed machinists and CNC operators install this insert in compatible toolholders on production turning equipment.

This insert is optimized for turning steel as its primary workpiece material (ISO material code P) and cast iron as its secondary workpiece material (ISO material code K). It is suited for medium finishing passes where controlled chip evacuation and edge security are required. The PF chip breaker geometry is intended for light-to-medium depths of cut and moderate feed rates on ferrous materials. Typical installation environments include production machine shops, job shops, and maintenance repair operations running CNC or manual lathes. The ISO designation for this insert is CNMG 12 04 04-PF 4415, which corresponds to the manufacturers catalog number CNMG 431-PF 4415.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for thermal stability and wear resistance
• 80-degree diamond insert shape (CNMG) with neutral hand orientation
• PF chip breaker geometry optimized for light-to-medium finishing cuts on steel and cast iron
• Four usable cutting edges per insert for extended tooling economy
• 0.40 mm corner radius for balanced edge strength and surface finish capability
• Compatible with clamp and screw insert holding methods

Compatibility

This insert carries ISO designation CNMG 12 04 04-PF 4415 and is designed as a replacement-grade turning insert for use in CNMG-style toolholders that accept a 12.70 mm inscribed circle, 4.76 mm thick diamond insert with a 5.16 mm hole diameter. Verify toolholder specifications before installation.

Installation Notes

Indexable turning inserts are installed and replaced by CNC machinists and toolroom technicians. Power down the machine and follow lockout-tagout procedures before changing any insert. Seat the insert fully against the pocket locating surfaces before tightening the clamp or screw to the toolholder manufacturers specified torque. Inspect the insert pocket and shim for wear or debris prior to seating a new cutting edge.