Sandvik Coromant 7860823 Turning Insert SCMT431-PM 4425

Product Description

The SANDVIK COROMANT 7860823 is a square-shaped indexable turning insert in the CoroTurn 107 series, designated SCMT431-PM 4425. It is manufactured from solid carbide and coated via CVD with a multilayer TiCN, Al2O3, and TiN stack, grade 4425. This coating combination targets steel and cast iron machining, providing wear resistance and thermal protection during continuous and interrupted turning operations. The insert carries a neutral hand orientation and features a PM chip breaker geometry. With four cutting edges per insert, it offers strong value in high-volume production turning environments. Licensed machinists and CNC operators install this insert in compatible CoroTurn 107 toolholders.

This insert is suited for external and internal turning applications on steel (ISO material code P) and cast iron (ISO material code K) workpieces. The PM chip breaker geometry is designed for medium roughing to finishing cuts in these material groups. It is commonly used in production turning on CNC lathes in both job shops and high-volume manufacturing cells. The ISO designation for this insert is SCMT 12 04 04-PM 4425, and the manufacturer catalog number is SCMT 431-PM 4425.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for extended tool life in steel and cast iron
• Grade 4425 carbide substrate engineered for ISO P and K workpiece materials
• Square insert shape (code S) with 7-degree relief angle and tolerance code M
• Four usable cutting edges per insert for reduced tooling cost per part
• PM chip breaker geometry optimized for medium roughing to finishing pass ranges
• Compatible with both clamp and screw insert holding methods

Compatibility

Designed as a direct-fit replacement insert for CoroTurn 107 series toolholders accepting SCMT style inserts with a 0.5 inch inscribed circle and screw or clamp retention. ISO code SCMT 12 04 04-PM 4425 confirms holder pocket compatibility.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians following standard indexable insert seating procedures. The machine spindle must be stopped and the turret fully indexed to a safe position before changing inserts. Use the appropriate torx or hex key to torque the clamp or screw to the toolholder manufacturer specification. Inspect the insert pocket seating surface for chips or debris before seating each new cutting edge to ensure proper contact and runout control.