Sandvik Coromant 7860799 Turning Insert DNMG431-PF 4425

Product Description

The SANDVIK COROMANT 7860799 is a DNMG431-PF 4425 turning insert designed for external turning operations on CNC lathes and turning centers. It is manufactured from solid carbide with a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, delivering wear resistance and thermal stability across a range of cutting conditions. The insert features a 55-degree diamond shape (Insert Shape Code D), a neutral hand orientation, and a 0.40 mm (0.0156 inch) corner radius. With a 0.5000-inch (12.70 mm) inscribed circle and the PF chip breaker geometry, this insert is suited for finishing and semi-finishing passes. It is installed by machinists and CNC operators in precision turning applications.

This insert is intended for primary use on steel workpieces (ISO material code P) and secondary use on cast iron (ISO material code K). It fits into the T-Max P tooling series and is used in residential shop, production, and contract machining environments where consistent chip control and surface finish are required on ferrous materials. Typical applications include shaft turning, facing, and profiling operations at moderate to high cutting speeds.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for enhanced wear and heat resistance
• 55-degree diamond insert shape with neutral hand for versatile mounting
• PF chip breaker geometry optimized for finishing and semi-finishing on steel
• 4 cutting edges per insert for extended tool life and cost efficiency
• Clamp and screw holding method compatible with standard DNMG toolholders
• ISO code DNMG 15 04 04-PF 4425 for cross-reference with standard toolholder catalogs

Compatibility

Designed for use in the SANDVIK COROMANT T-Max P tooling series. Compatible with standard DNMG toolholders accepting a 0.5000-inch inscribed circle insert with clamp or screw holding. ISO code DNMG 15 04 04-PF 4425; Manufacturers Catalog Number DNMG 431-PF 4425.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torque wrench and clamp hardware specified for the toolholder to secure the insert without over-tightening the clamping screw. Inspect the insert seat and chip groove for debris before seating a new insert to ensure proper contact and edge presentation.