Sandvik Coromant 7861075 Turning Insert VCMT221-PM 4425

Product Description

The SANDVIK COROMANT 7861075 is a solid carbide turning insert in the CoroTurn 107 series, designed for precision external and internal turning operations on CNC lathes and turning centers. It carries a VCMT insert style with a 35-degree diamond shape, a 1/4-inch inscribed circle, and a 0.40 mm corner radius. The insert features a CVD-applied multilayer coating consisting of Al2O3, TiN, and TiCN, which provides wear resistance and thermal stability during continuous and interrupted cuts. The PM chip breaker geometry is optimized for controlled chip flow and reduced cutting forces. Licensed machinists and CNC operators install this insert in compatible toolholders for finish to semi-finish turning applications.

This insert is suited for turning steel as its primary workpiece material and cast iron as its secondary workpiece material. The neutral hand orientation makes it compatible with both right-hand and left-hand toolholder setups depending on the application. The CoroTurn 107 series is commonly applied in production turning environments where consistent surface finish and tool life are priorities. It is appropriate for both light and moderate depth-of-cut operations in a shop or manufacturing environment.

Key Features

• CVD multilayer coating: Al2O3, TiN, and TiCN for extended wear resistance
• 35-degree diamond insert shape (V) for access in tight profiling situations
• PM chip breaker geometry for controlled chip formation in steel turning
• 0.40 mm corner radius for semi-finish to finish turning surface quality
• Neutral insert hand — compatible with multiple toolholder orientations
• Two cutting edges per insert for extended usable life per piece

Compatibility

Designed for use in SANDVIK COROMANT CoroTurn 107 series toolholders that accept VCMT 11 03 04 style inserts. ISO code VCMT 11 03 04-PM 4425. Compatible toolholders must support clamp or screw insert holding methods with a VCMT-style seat and appropriate clearance.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician with the machine powered down and the spindle locked before insert indexing or replacement. Use the manufacturer-specified torque wrench or screwdriver for clamp and screw-type holders to avoid seat damage. Inspect the insert pocket and seating surface for chips or debris before seating the new insert. Follow all applicable shop safety procedures when handling carbide inserts, as edges are extremely sharp.