Sandvik Coromant 6868351 Turning Insert TCMT221-KF 3210

Product Description

The SANDVIK COROMANT 6868351 is a solid carbide turning insert designed for precision external and internal turning operations. It carries the TCMT221-KF designation with a 3210 manufacturer grade and features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN for wear resistance and thermal protection. The insert has a 60-degree triangular shape, a 0.25-inch (6.35 mm) inscribed circle, and a 1/64-inch (0.40 mm) corner radius. It is screw-held with a neutral hand orientation, making it compatible with standard TCMT-style toolholders. Licensed machinists and CNC turning specialists install this insert in production and job-shop environments.

This insert is part of the CoroTurn 107 series and is optimized for turning cast iron workpiece materials, designated as primary workpiece material code K. The KF chip breaker geometry supports controlled chip formation during light-to-medium depth cuts, with a maximum depth of cut of 10.34 mm. It is suited for both roughing and finishing passes on cast iron components in CNC lathe and turning center applications.

Key Features

• CVD-applied TiCN, Al2O3, and TiN multilayer coating for extended tool life on cast iron
• KF chip breaker geometry for controlled chip evacuation
• 60-degree triangle insert shape with 3 usable cutting edges
• 1/64-inch (0.40 mm) corner radius for balanced edge strength and surface finish
• Screw-held mounting method with neutral hand orientation
• ISO code TCMT 11 03 04-KF 3210 for cross-reference and toolholder matching

Compatibility

Designed for use in TCMT-style screw-clamp toolholders within the CoroTurn 107 series. ISO code TCMT 11 03 04-KF 3210 can be used to verify toolholder and insert pocket compatibility.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before indexing or replacing inserts. Use the correct Torx or hex key for the clamping screw as specified by the toolholder manufacturer — do not overtighten, as this can fracture the insert or damage the pocket seat. Inspect the insert pocket for chips or debris before seating a new insert.