Sandvik Coromant 7860829 CCMT432-PR 4425 Turning Insert

Product Description

The SANDVIK COROMANT 7860829 is a CCMT432-PR 4425 grade solid carbide turning insert from the CoroTurn 107 series. It features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, delivering wear resistance and thermal stability during continuous and semi-continuous turning operations. The insert has an 80-degree diamond shape with a 0.79 mm corner radius and a 12.70 mm inscribed circle diameter. With a neutral hand orientation and a PR chip breaker geometry, it is engineered for productive steel turning with reliable chip control. Machinists and CNC lathe operators working in job shops or production environments are the primary installers.

This insert is suited for turning operations on steel as its primary workpiece material, with cast iron as a secondary application. The CoroTurn 107 series targets external turning on CNC lathes using clamp and screw holding systems. The PR chip breaker is optimized for medium-depth cuts on low-to-medium alloy steels, making this insert a practical choice for general-purpose turning in both job shop and production machining environments where consistent surface finish and tool life are priorities.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear resistance and thermal protection
• 80-degree diamond insert shape (Shape Code C) for versatile external turning
• 0.79 mm corner radius (0.0313 inches) for balanced edge strength and surface finish
• PR chip breaker geometry optimized for steel turning with reliable chip evacuation
• Neutral hand orientation for flexible toolholder pairing
• Clamp and screw holding method compatible with CoroTurn 107 toolholders

Compatibility

Designed for use with CoroTurn 107 series toolholders that accept CCMT 12 04 08 inserts secured by clamp or screw clamping. ISO code CCMT 12 04 08-PR 4425 and manufacturers catalog number CCMT 432-PR 4425 apply. Primary workpiece material is steel (ISO P); secondary workpiece material is cast iron (ISO K).

Installation Notes

Turning inserts of this type are seated and secured by a licensed machinist or CNC operator following the toolholder manufacturer's clamping torque and seating procedures. Ensure the machine spindle is fully stopped and locked out before changing inserts. Inspect the insert pocket and clamping hardware for wear or debris before seating a new insert. Follow applicable shop safety standards and toolholder manufacturer guidelines for proper insert orientation and clamping.