Sandvik Coromant 7859042 Turning Insert CNMG432-PF 4415

Product Description

The SANDVIK COROMANT 7859042 is a CNMG432-PF 4415 indexable turning insert designed for external and internal turning operations on CNC lathes and turning centers. Part of the T-Max P series, this insert features a solid carbide substrate with a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, providing wear resistance and thermal protection during continuous and interrupted cuts. The 80-degree diamond insert shape (ISO code CNMG 12 04 08-PF 4415) delivers four usable cutting edges. With a 0.5-inch inscribed circle and a 0.79 mm (0.0313 inch) corner radius, it suits medium to roughing passes on steel and cast iron. A licensed machinist or CNC operator installs and indexes this insert.

This insert is engineered primarily for steel (ISO material code P) with cast iron (ISO material code K) as the secondary workpiece material. The PF chip breaker geometry is optimized for finishing to medium turning passes where controlled chip formation matters. The neutral hand orientation suits a wide range of standard CNMG toolholders. It is commonly used in production turning environments, job shops, and maintenance machining where consistent tool life and predictable surface finish are required on ferrous materials.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for thermal and abrasion resistance
• 80-degree diamond insert shape with 4 usable cutting edges for extended tool life
• 0.79 mm corner radius balances surface finish quality with edge strength
• PF chip breaker geometry suited for finishing to medium turning passes on steel
• T-Max P series construction with clamp and screw holding method compatibility
• Neutral hand orientation for broad toolholder compatibility

Compatibility

Designed as a direct-fit replacement and standard stocking insert for CNMG 432 toolholders accepting clamp or screw holding methods with clearance code N and tolerance code M. ISO catalog designation is CNMG 12 04 08-PF 4415. Primary application is steel; secondary application is cast iron.

Installation Notes

Installation is performed by a qualified CNC machinist or toolroom technician. Power down and de-energize the machine before indexing or replacing inserts. Use the appropriate torque wrench and manufacturer-specified clamp or screw hardware for the toolholder; do not over-tighten the clamping screw, as this can damage the insert seat or fracture the carbide. Confirm insert seating and clearance before resuming cuts.