Sandvik Coromant 7859047 Turning Insert CNMG433-PF 4415

Product Description

The SANDVIK COROMANT 7859047 is a CNMG-style indexable turning insert in the T-Max P series, designed for external turning operations on CNC lathes and turning centers. It carries manufacturer grade 4415 and features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides thermal resistance and wear protection across a wide range of cutting speeds. The insert has an 80-degree diamond shape (C-type), a neutral hand orientation, a 1.19 mm corner radius, and a 0.5-inch inscribed circle. It is held in place by clamp or screw, depending on the toolholder. Licensed machinists and CNC turning technicians are the primary users of this insert.

This insert is engineered primarily for machining steel (ISO material code P) and secondarily for cast iron (ISO material code K). It fits into T-Max P series toolholders sized for CNMG 12 04 12 geometry. Typical applications include roughing and semi-finishing passes on carbon steel, alloy steel, and gray cast iron components in production turning environments, both in shop and job-shop settings. ISO code for this insert is CNMG 12 04 12-PF 4415. The PF chip breaker geometry is optimized for controlled chip formation at light to medium feed rates.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for extended tool life in steel and cast iron turning
• 80-degree diamond insert shape with 4 usable cutting edges per insert
• 1.19 mm corner radius for balanced surface finish and edge strength
• PF chip breaker geometry for predictable chip control at light to medium feeds
• Neutral hand orientation compatible with standard CNMG toolholders
• Clamp and screw holding method for rigid, repeatable seating in T-Max P holders

Compatibility

Designed for use in T-Max P series CNMG 12 04 12 toolholders. Compatible primary workpiece material is steel (ISO P); compatible secondary workpiece material is cast iron (ISO K). ISO designation: CNMG 12 04 12-PF 4415.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician with the machine spindle fully stopped and the machine in a locked-out, tagged-out state. Inspect the toolholder seat and clamp components for debris or wear before seating the insert. Use the appropriate torque wrench and manufacturer-specified seating procedure for the clamp or screw style holder to avoid insert rocking or premature edge failure. Do not exceed the insert thickness seating depth or attempt to re-grind this indexable insert.