Sandvik Coromant 7861004 Turning Insert WNMG333-PR 4425

Product Description

The SANDVIK COROMANT 7861004 is a WNMG-style indexable turning insert from the T-Max P series, designed for external and internal turning operations on CNC lathes and turning centers. It carries the ISO designation WNMG 06 04 12-PR 4425 and features a carbide substrate with a CVD-applied multilayer coating of Al2O3, TiCN, and TiN. The 80-degree square insert shape provides a strong cutting edge geometry suited for medium to finishing passes. With a 3/8-inch inscribed circle and a 0.0469-inch corner radius, it suits a broad range of turning toolholders accepting the WNMG 333 form factor. Licensed machinists and CNC operators install and index these inserts as part of routine tooling maintenance.

This insert is rated for ISO material groups P and K, covering carbon and alloy steels as well as cast irons. It fits common turning applications in general machining shops, production turning cells, and job shops running ferrous workpieces. The PR chip breaker geometry and grade 4425 substrate support stable cutting in medium-depth passes where predictable chip control and edge life are priorities. It is sold individually but carries a minimum order quantity of 10 units per the manufacturer's packaging structure.

Key Features

• CVD multilayer coating: Al2O3, TiCN, and TiN for wear and crater resistance on steel and cast iron
• Grade 4425 carbide substrate suited for ISO P and K material groups
• 80-degree square insert shape (W) with neutral hand orientation
• 0.0469-inch corner radius for medium-finish turning passes
• PR chip breaker geometry for controlled chip evacuation
• Compatible with clamp and screw insert-holding methods
• ISO code WNMG 06 04 12-PR 4425 for direct cross-reference with toolholder catalogs

Compatibility

Designed for use in WNMG-style turning toolholders that accept a 3/8-inch inscribed circle insert with a size code of 06 04 12. Compatible with clamp-style and screw-retention toolholders per ISO WNMG mounting standards. Suitable for ISO P and K workpiece material groups.

Installation Notes

CNC machinists and toolroom technicians index or replace these inserts during scheduled tooling changes on turning centers and engine lathes. Power down and lock out the spindle before accessing the turret or toolholder. Seat the insert fully against the toolholder pocket and torque the clamping screw or clamp according to the toolholder manufacturer's specification. Inspect the insert pocket for chips or debris before seating a new insert to ensure proper edge registration and prevent premature insert breakage.