Sandvik Coromant 7860991 WNMG432-PM 4425 Turning Insert

Product Description

The SANDVIK COROMANT 7860991 is a WNMG432-PM 4425 trigon turning insert designed for external turning operations on CNC lathes and turning centers. Built from solid carbide with a CVD-applied multilayer coating of Al2O3, TiCN, and TiN, this insert is engineered for wear resistance and thermal stability during continuous and interrupted cuts. The 80-degree included angle of the trigon shape provides six usable cutting edges per insert, and the neutral hand orientation suits a wide range of toolholder setups. The PM chip breaker geometry is optimized for steel turning at moderate to high feed rates.

This insert fits the T-Max P series toolholding system and is intended for production turning of steel and cast iron workpieces in both residential shop and industrial manufacturing environments. Typical applications include shaft turning, facing, and profiling on ferrous materials. The WNMG432-PM 4425 designation follows ISO standard WNMG 08 04 08-PM 4425, making cross-referencing with other tooling systems straightforward for machinists and tool-crib managers. It is installed and changed by machinists and CNC setup technicians.

Key Features

• CVD multilayer coating: Al2O3, TiCN, and TiN for high-temperature wear resistance
• 80-degree trigon insert shape with six cutting edges per insert
• PM chip breaker geometry suited for steel turning at moderate to high feed rates
• Neutral hand orientation compatible with a broad range of WNMG-style toolholders
• Clamp and screw holding method for secure, repeatable seating
• ISO code WNMG 08 04 08-PM 4425 for straightforward cross-referencing

Compatibility

Designed for use in the T-Max P series toolholding system. Primary workpiece material is steel (ISO P); secondary workpiece material is cast iron (ISO K). Compatible with WNMG-style toolholders accepting a 0.5000-inch inscribed circle insert with clamp or screw holding.

Installation Notes

Insert replacement should be performed with the machine spindle stopped and all power isolated per shop lockout/tagout procedures. Use the appropriate torx or hex key to seat the clamp or screw firmly without over-torquing. Inspect the insert pocket and shim for wear or debris before seating a new insert. Verify correct insert orientation and hand before resuming cuts.