Walter 6069444 SPMT120408-D51 WKP25S Milling Insert

Product Description

The WALTER 6069444 is a square-style indexable milling insert designated SPMT120408-D51 in grade WKP25S. It is manufactured from solid carbide and finished with a CVD-applied multilayer coating of TiCN / Al2O3 / TiCN, a stack engineered for thermal stability and wear resistance during interrupted and continuous milling passes. The insert seats via screw-clamping in a positive-rake configuration with an 11-degree relief angle and a honed cutting edge. With four usable cutting edges per insert and a neutral hand orientation, it delivers cost-efficient tool life on production runs. Licensed machinists and CNC operators working in job shops or high-volume machining cells are the primary installers.

This insert is intended for face milling and shoulder milling applications in steel and cast iron workpieces, corresponding to ISO material groups P and K. The WKP25S grade is suited to a broad range of cutting conditions within those material groups, including semi-finishing and roughing passes where chip load and heat generation are moderate to high. The D51 chip breaker geometry manages chip evacuation effectively across varying feed rates. The insert is compatible with the WALTER F2239 cutter series.

Key Features

• Solid carbide substrate with CVD multilayer TiCN / Al2O3 / TiCN coating for extended tool life in steel and cast iron
• Four cutting edges per insert with neutral hand - maximizes value per insert
• D51 chip breaker geometry for controlled chip formation across feed rate ranges
• Positive rake angle (10 degrees) with honed cutting edge reduces cutting forces and edge chipping risk
• 0.0315-inch (0.80 mm) corner radius balances surface finish quality and edge strength
• Meets ANSI and ISO standards; ANSI/ISO code SPMT120408-D51 WKP25S

Compatibility

Designed for use in the WALTER F2239 cutter series. Insert geometry conforms to ANSI and ISO SPMT120408-D51 specifications. Verify toolholder pocket geometry and screw-clamping system before substituting in non-WALTER bodies.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torx or hex key specified by the toolholder manufacturer to seat the clamping screw - do not overtighten, as this can crack the carbide substrate. Inspect the insert pocket seating surface for chips or debris before seating a new insert to ensure full contact and accurate positioning.