Sandvik Coromant 7859066 Turning Insert DNMG442-PF 4415

Product Description

The SANDVIK COROMANT 7859066 is a DNMG-style indexable turning insert in the T-Max P series, engineered for external turning operations on steel and cast iron. The insert carries a CVD-applied multilayer coating of TiCN, Al2O3, and TiN under manufacturer grade 4415, providing wear resistance and thermal stability at the cutting edge. It features a 55-degree diamond shape (Insert Shape Code D), a neutral hand orientation, and a PF chip breaker geometry designed to control chips effectively in medium-range steel turning. With four cutting edges per insert, service intervals between index events are extended on production runs. This insert is seated and held by clamp or screw methods and is used by machinists and CNC turning center operators in job shops and production facilities.

The 7859066 is suited for turning steel workpieces as its primary application, with cast iron as a secondary workpiece material. The PF chip breaker geometry is optimized for finishing to medium roughing passes on external diameters and faces. It fits standard DNMG 15 06 08 toolholders (ISO code DNMG 15 06 08-PF 4415) and is identified under manufacturer catalog number DNMG 442-PF 4415. Typical installation scenarios include CNC lathes and turning centers in both production and repair machine shops.

Key Features

• CVD multilayer coating: TiCN, Al2O3, TiN for wear and heat resistance on steel and cast iron
• 55-degree diamond insert shape with four indexable cutting edges
• PF chip breaker geometry for controlled chip formation in steel turning
• Neutral hand orientation for flexible toolholder compatibility
• Clamp and screw holding method for secure seating under cutting loads
• T-Max P series designation for consistent OEM interchangeability

Compatibility

Compatible with DNMG 15 06 08 style toolholders. ISO code DNMG 15 06 08-PF 4415 applies. Designed for use on steel (primary) and cast iron (secondary) workpiece materials in external CNC turning applications.

Installation Notes

Installation is performed by machinists or CNC tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully in the pocket before engaging the clamp or screw; an improperly seated insert can fracture under cutting loads. Inspect the insert pocket and shim for damage at each index event.