Sandvik Coromant 7861220 Turning Insert TNMG332R-K 4425

Product Description

The SANDVIK COROMANT 7861220 is a TNMG-style indexable turning insert in the T-Max P series, designed for external and internal turning operations on CNC lathes and turning centers. The insert is manufactured from solid carbide with a CVD-applied multilayer coating of Al2O3, TiCN, and TiN, giving it high wear resistance and thermal stability at elevated cutting speeds. Key geometry features include a 60-degree triangular shape, a 3/8-inch inscribed circle, and a 1/32-inch corner radius with a K-style chip breaker. The right-hand cutting orientation and TNMG form factor make it a widely used insert for production turning in job shop and high-volume manufacturing environments. Licensed machinists and CNC operators are the primary installers.

This insert is suited for turning steel as its primary workpiece material (ISO material code P) and cast iron as a secondary workpiece material (ISO material code K). The K chip breaker geometry is optimized for medium to finishing passes where controlled chip formation is critical. The T-Max P series is a standard tooling platform used in external turning, facing, and profiling applications on both manual and CNC turning equipment. The 6 available cutting edges per insert support efficient tooling economics in production environments.

Key Features

• CVD multilayer coating: Al2O3, TiCN, and TiN for high-temperature wear resistance
• 60-degree triangular insert shape with 6 usable cutting edges
• K chip breaker geometry for controlled chip formation on steel and cast iron
• 3/8-inch inscribed circle and 1/32-inch corner radius for medium to finishing cuts
• Right-hand cutting orientation; compatible with clamp and screw holding methods
• ISO code TNMG 16 04 08R-K 4425 for cross-reference with standard tooling catalogs

Compatibility

Designed for use in toolholders accepting TNMG-style inserts with a 3/8-inch inscribed circle and clamp or screw holding method. ISO designation TNMG 16 04 08R-K 4425 can be used to cross-reference compatible toolholder systems. No specific machine or holder model numbers were provided in the product data.

Installation Notes

Insert replacement should be performed by a qualified machinist or CNC operator with the machine fully stopped and in a safe, locked-out state. Use the appropriate torx or hex key to secure the clamping screw or clamp to the toolholder manufacturer's specified procedure. Inspect the insert seat and shim for debris or damage before seating a new insert. Verify insert orientation matches the right-hand designation of the toolholder before resuming cuts.