Sandvik Coromant 6868290 Turning Insert Tcmt Coroturn 107

Product Description

The SANDVIK COROMANT 6868290 is a TCMT-style triangular turning insert designed for precision metal cutting in CNC lathe and turning center applications. Manufactured from solid carbide and coated with a CVD-applied TiCN, Al2O3, and TiN multilayer coating, this insert delivers thermal resistance and wear performance suited to cast iron and similar workpiece materials. It features a 1/4 inch (0.2500 inch) inscribed circle, a 1/64 inch (0.0156 inch) corner radius, and a KM chip breaker geometry. Licensed machinists and CNC operators install this insert as part of the CoroTurn 107 series tooling system.

This insert is intended for external turning operations where consistent chip control and surface finish are required. The KM chip breaker is optimized primarily for cast iron workpieces, making it a practical choice for production environments running gray iron, ductile iron, or similar materials. The neutral hand orientation allows use in standard right-hand toolholders compatible with the TCMT insert pocket style. The 60-degree triangle geometry provides three usable cutting edges per insert, reducing per-edge tooling cost in high-volume turning operations.

Key Features

• CVD-applied TiCN, Al2O3, and TiN multilayer coating for thermal and abrasion resistance
• KM chip breaker geometry optimized for cast iron (ISO material group K)
• Three usable cutting edges per insert from 60-degree triangle shape
• 1/64 inch corner radius with rounded cutting edge style for controlled edge strength
• Screw-type insert holding method for secure, repeatable seating in CoroTurn 107 toolholders
• Neutral hand orientation compatible with standard TCMT-pocket toolholders

Compatibility

Designed for use with CoroTurn 107 series toolholders accepting TCMT-style inserts with a screw-clamp holding method. ISO code designation is TCMT 11 03 04-KM 3225. Verify toolholder pocket geometry and screw specifications before installation.

Installation Notes

Insert replacement is performed by machining professionals or CNC toolroom technicians. Power down and lock out the machine before changing inserts. Use the appropriate Torx or insert-clamping screw driver specified by the toolholder manufacturer to seat the screw — do not overtighten by feel alone. Inspect the toolholder pocket for chips or damage before seating a new insert, as debris in the pocket will affect runout and surface finish.