Sandvik Coromant 7860915 Turning Insert CNMG431-LC 4425

Product Description

The SANDVIK COROMANT 7860915 is a CNMG431-LC 4425 turning insert designed for precision external turning operations on CNC lathes and turning centers. Built from solid carbide and coated via CVD with a multilayer TiCN, Al2O3, and TiN finish, this insert delivers thermal resistance and wear protection at elevated cutting speeds. The 80-degree diamond shape (Insert Shape Code C) provides a strong cutting edge suited for medium to roughing passes. A 0.4 mm corner radius and neutral hand orientation make it a versatile option across a wide range of workpiece geometries. It carries ISO designation CNMG 12 04 04-LC 4425 and belongs to the T-Max P series, a platform built for steel and general turning applications.

This insert is intended for use in steel turning applications, classified under ISO workpiece material code P. The LC chip breaker geometry and 4425 grade are optimized for stable, continuous cuts in low-to-medium alloy steels at moderate-to-high cutting speeds. Typical install scenarios include production turning environments where consistent tool life and predictable chip control are required. Machinists and CNC programmers in job shops, production facilities, and metalworking operations are the primary users. The insert fits standard CNMG 431 toolholders with clamp or screw holding methods.

Key Features

• CVD-applied TiCN, Al2O3, and TiN multilayer coating for thermal and wear resistance
• 80-degree diamond insert shape (Code C) with a 0.4 mm corner radius for strong edge geometry
• Grade 4425 carbide substrate suited for steel turning at moderate-to-high speeds
• LC chip breaker geometry promotes controlled chip formation in continuous cuts
• Neutral hand orientation for flexible toolholder compatibility
• Tolerance Code M and Clearance Code N per ISO CNMG standard

Compatibility

Fits standard CNMG 431 toolholders using clamp or screw holding methods. ISO designation CNMG 12 04 04-LC 4425 confirms compatibility with any holder specifying the CNMG 1204 insert pocket. Verify toolholder seating, shim condition, and clamp type before installation.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use appropriate insert-seating tools and inspect the toolholder pocket and shim for damage or debris before seating the new insert. Do not exceed the toolholder manufacturer's recommended clamping torque specification for the CNMG pocket size.