Sandvik Coromant 7861054 Turning Insert VBMT331-PF 4425

Product Description

The SANDVIK COROMANT 7861054 is a VBMT-style indexable turning insert from the CoroTurn 107 series, manufactured from solid carbide and finished with a CVD-applied multilayer coating of Al2O3, TiN, and TiCN in manufacturer grade 4425. The insert features a 35-degree diamond shape (V-shape code) with a 3/8-inch inscribed circle and a 0.40 mm corner radius. The neutral hand orientation and PF chip breaker geometry make this insert suited for finishing and light finishing passes on steel and cast iron workpieces. Licensed machinists and CNC lathe operators install this insert in compatible CoroTurn 107 toolholders.

This insert is designed for external turning operations on steel (ISO material code P) as the primary workpiece material and cast iron (ISO material code K) as the secondary workpiece material. The PF chip breaker is optimized for finishing cuts requiring tight tolerances and consistent chip control. It is well suited for light-depth, close-tolerance turning applications in production and job-shop CNC environments. The insert uses a clamp-and-screw holding method and carries tolerance code M with clearance code B.

Key Features

• CVD-applied multilayer coating: Al2O3, TiN, and TiCN for extended wear resistance on steel and cast iron
• Grade 4425 solid carbide substrate suited for finishing on ISO P and K materials
• 35-degree diamond insert shape with 0.40 mm corner radius for precision finishing geometry
• PF chip breaker promotes controlled chip evacuation during light finishing passes
• 2 cutting edges per insert; neutral hand orientation for flexible toolholder setups
• Clamp-and-screw holding method provides secure seating in CoroTurn 107 toolholders

Compatibility

Designed for use with SANDVIK COROMANT CoroTurn 107 series toolholders accepting VBMT-style inserts. ISO code VBMT 16 04 04-PF 4425; industry standard number VBMT 16 04 04-PF 4425. Insert size code 1604. Verify toolholder pocket geometry and clamping system before installation.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torque wrench and manufacturer-specified clamping hardware for the CoroTurn 107 toolholder to ensure proper seating. Inspect the insert pocket and seating surface for chips or debris before installing a fresh cutting edge.