Sandvik Coromant 7861276 Turning Insert DNMG432-XF 4425

Product Description

The SANDVIK COROMANT 7861276 is a DNMG-style indexable turning insert designed for external turning operations on CNC lathes and turning centers. It carries the manufacturer grade 4425 and features a multi-layer CVD coating of Al2O3, TiCN, and TiN applied over a solid carbide substrate, providing wear resistance and thermal protection at high cutting speeds. The insert has a 55-degree diamond shape, a 0.5-inch inscribed circle, and a 0.0313-inch corner radius. With four usable cutting edges and a neutral hand orientation, it is suited for both finishing and light-to-moderate material removal. Installation and replacement are handled by licensed machinists and CNC operators in production and job-shop environments.

This insert is engineered primarily for machining steel (ISO material group P) and secondarily for cast iron (ISO material group K). The XF chip breaker geometry is optimized for finishing passes with light depth of cut and low feed rates, producing controlled chip formation and consistent surface finish. It is a practical choice for automotive, general engineering, and component manufacturing applications where tight tolerances and surface quality are required on steel and cast iron workpieces.

Key Features

• DNMG insert style with 55-degree diamond shape and neutral hand orientation
• Multi-layer CVD coating: Al2O3, TiCN, and TiN for extended tool life on steel and cast iron
• XF chip breaker geometry suited for finishing cuts with controlled chip formation
• Four cutting edges per insert for extended value in high-volume production
• Clamp and screw holding method compatible with standard DNMG toolholders
• ISO code DNMG 15 04 08-XF 4425 for cross-reference with standard toolholder systems

Compatibility

Designed for use in standard DNMG-style toolholders that accept clamp and screw insert holding. Primary workpiece material is steel (ISO P); secondary workpiece material is cast iron (ISO K). ISO industry standard number DNMG 15 04 08-XF 4425.

Installation Notes

Indexable turning inserts are installed and indexed by qualified machinists or CNC operators. Power down and lock out the machine spindle before seating or indexing the insert. Ensure the insert pocket and seating surface are clean and free of chips before clamping. Follow the toolholder manufacturer torque guidelines for the clamping screw to avoid insert cracking or improper seating.