Sandvik Coromant 6868540 Turning Insert TNMG432-KM 3225

Product Description

The SANDVIK COROMANT 6868540 is a TNMG432-KM 3225 grade turning insert designed for external and internal turning operations on CNC lathes and turning centers. It features a triangular 60-degree insert shape with a negative rake geometry and a CVD-applied multilayer coating of TiCN, Al2O3, and TiN for high wear resistance and thermal protection. The 0.5 inch inscribed circle and 0.0313 inch corner radius suit medium to roughing passes. With 6 usable cutting edges per insert, this carbide grade is built specifically for cast iron machining from high wear-resistance to high toughness applications.

The 6868540 belongs to the SANDVIK COROMANT T-Max P series, a platform engineered for productive turning across a wide range of metal-cutting conditions. It is best suited for roughing and medium machining of cast iron workpieces in production environments. The KM chip breaker geometry controls chip flow effectively during interrupted and continuous cuts at moderate to aggressive feed rates. This insert is held in place using either a clamp or pin holding method, depending on the toolholder configuration, and is compatible with standard TNMG-style toolholders used in production turning cells.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for extended tool life in cast iron
• KM chip breaker optimized for roughing and medium machining operations
• 6 cutting edges per insert for low cost-per-edge efficiency
• Negative side clearance geometry provides stable edge support under high cutting loads
• Rounded cutting edge style reduces micro-chipping on cast iron entry and exit
• Maximum depth of cut up to 21.20 mm supports aggressive material removal rates

Compatibility

Designed for use in TNMG-style toolholders accepting a 432 ANSI size code insert (ISO size code 220408). Compatible with clamp-style and pin-lock toolholder systems. Intended for use within the SANDVIK COROMANT T-Max P turning system.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torque wrench or clamping screw driver as specified by the toolholder manufacturer when seating the insert — do not overtighten. Inspect the insert pocket and seating surface for chips or debris before inserting to ensure proper contact and prevent edge damage.