Sandvik Coromant 7861059 Turning Insert WNMG431-PF 4425

Product Description

The SANDVIK COROMANT 7861059 is a solid carbide turning insert carrying the WNMG431-PF designation in grade 4425, part of the T-Max P series. It features a trigon (80-degree included angle) insert shape with a neutral hand orientation and a 0.4 mm (0.0156 inch) corner radius. The insert is CVD-coated with a multilayer Al2O3, TiCN, and TiN stack, making it well suited for productive turning of steel and cast iron workpieces. With six cutting edges and compatibility with both clamp and screw holding methods, this insert delivers consistent tool life across medium to finishing turning operations. Licensed machinists and CNC lathe operators install this insert as an OEM-specification replacement or production consumable.

This insert is designed for turning operations on steel (ISO material group P) and cast iron (ISO material group K), covering a broad range of roughing-to-finishing passes. The PF chip breaker geometry is optimized for controlled chip formation at moderate feed rates, which is typical in production environments running CNC turning centers. The T-Max P series is a widely used platform in industrial machining shops handling general-purpose external and internal turning. ISO code WNMG 08 04 04-PF 4425 and industry standard number WNMG 08 04 04-PF 4425 confirm dimensional and grade conformance for direct specification matching.

Key Features

• CVD multilayer coating (Al2O3, TiCN, TiN) for wear resistance on steel and cast iron
• 80-degree trigon insert shape (WNMG) with neutral hand orientation
• PF chip breaker geometry for controlled chip formation at moderate feeds
• Six usable cutting edges per insert for extended consumable value
• Clamp and screw holding method compatibility for flexible toolholder use
• Inscribed circle of 0.5 inches with 0.1875-inch insert thickness

Compatibility

Designed as a direct OEM-specification replacement conforming to ISO code WNMG 08 04 04-PF 4425. Compatible with toolholders designed for WNMG-style inserts using clamp or screw holding methods within the T-Max P series platform. Primary workpiece material is steel (ISO code P); secondary workpiece material is cast iron (ISO code K).

Installation Notes

Installation is performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before changing inserts. Use the appropriate torque wrench and seating tool specified for the toolholder to avoid cracking the carbide insert. Verify seating and clamping integrity before resuming cutting operations.