Sandvik Coromant 6868346 Turning Insert TCMT1.81.50-KF

Product Description

The SANDVIK COROMANT 6868346 is a solid carbide turning insert designed for precision finishing operations on cast iron workpieces. It carries the ANSI designation TCMT1.81.50-KF 3210 and the ISO designation TCMT 09 02 02-KF 3210. The insert features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which delivers high wear resistance with moderate toughness — the characteristic demand of cast iron (K-grade) applications. The 60-degree triangle shape with a positive side clearance and a 0.20 mm corner radius suits light, accurate finishing passes. The KF chip breaker geometry is optimized for controlled chip formation during finishing cuts.

This insert is used in external turning and light profiling operations, primarily on cast iron components in machining centers and CNC lathes. It belongs to the CoroTurn 107 series, which uses a screw-clamping insert-holding method. Typical applications include finishing passes on brake rotors, housings, and other cast iron parts where surface finish and dimensional accuracy are the priority. The 3210 grade is positioned for high wear resistance in stable, low-to-moderate interrupted cutting conditions. Machinists and CNC operators in production and job-shop environments install this insert as part of routine tooling changes.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for high wear resistance on cast iron
• KF chip breaker geometry engineered for finishing operations
• 60-degree triangle insert shape (T) with positive side clearance
• 0.20 mm corner radius for fine surface finish requirements
• Screw-clamping hold method compatible with CoroTurn 107 toolholders
• Maximum depth of cut: 9.17 mm

Compatibility

Designed for use in SANDVIK COROMANT CoroTurn 107 series toolholders that accept TCMT-style inserts with an ANSI size code of 1.81.50 and ISO size code 090202. Intended for CNC lathes and turning centers performing finishing operations on cast iron (ISO material group K) workpieces.

Installation Notes

Installation is performed by a qualified CNC operator or machinist. Power down and lock out the machine spindle before changing inserts. Use the appropriate Torx or hex key as specified by the toolholder manufacturer when tightening the clamping screw — do not overtighten. Inspect the insert seat and clamping screw for damage or debris before seating a new insert.