Sandvik Coromant 8021278 Vnmg 16 04 08-MF 4415 Turning Insert

Product Description

The SANDVIK COROMANT 8021278 is a VNMG-style carbide turning insert in grade 4415, designed for external turning operations on CNC lathes and turning centers. The insert features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides wear resistance and thermal stability across a range of cutting conditions. With a 0.375 inch inscribed circle and a 0.0313 inch corner radius, this insert is suited for medium to finishing passes. The neutral hand orientation makes it compatible with both left- and right-hand toolholders. It is installed by machinists and CNC operators on production and job-shop turning equipment.

This insert is used in metal cutting applications on ISO P and ISO K workpiece materials, covering steel, stainless, and cast iron. The MF chip breaker geometry is optimized for light to medium finishing cuts, delivering consistent chip control at moderate feed rates. Typical install scenarios include finishing passes on shafts, flanges, bores, and turned profiles in both production and repair machining environments. The insert seats in VNMG-compatible clamp or screw-type toolholders.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for extended tool life in steel and cast iron cutting
• 0.375 inch inscribed circle with 0.0313 inch corner radius for medium to finishing turning applications
• MF chip breaker geometry designed for light to medium finishing cuts with reliable chip control
• Neutral hand insert compatible with standard VNMG clamp and screw-type toolholders
• Carbide substrate in grade 4415 for thermal hardness and edge stability
• ISO code VNMG 16 04 08-MF 4415 for direct cross-reference and toolholder matching

Compatibility

Designed for use in VNMG-compatible clamp-style and screw-type turning toolholders accepting a V-shape insert with N clearance and M tolerance. Suitable for ISO P and ISO K workpiece material classifications as indicated by the series designation VNMG-MF (ISO P).

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Ensure the machine spindle is stopped and the turret is in a safe indexed position before seating or replacing the insert. Inspect the insert pocket and shim for damage or debris before installation, as a contaminated seat will affect edge height and cutting performance. Follow the toolholder manufacturer's torque procedure for clamp screws; do not overtighten, as carbide inserts are brittle under bending loads.