Sandvik Coromant 7860711 Turning Insert DNMG442-PM 4425

Product Description

The SANDVIK COROMANT 7860711 is a DNMG442-PM 4425 turning insert engineered for indexable tooling systems in CNC and manual turning applications. Built from solid carbide with a CVD-applied TiCN, Al2O3, and TiN multilayer coating, it delivers high wear resistance with adequate toughness for steel and cast iron machining. The insert features a 55-degree diamond (rhombic) shape, a 0.5 inch inscribed circle, a 0.79 mm corner radius, and a neutral hand orientation. The PM chip breaker geometry is rated for roughing and medium machining operations, making this insert a practical choice for production turning where consistent chip control and edge life are priorities.

This insert is suited for roughing and medium machining passes on steel and cast iron workpieces in both production and job-shop environments. The 4425 grade is characterized by high to moderate wear resistance with a balance of toughness, targeting primary workpiece material code P (steel) and secondary code K (cast iron). It fits into standard DNMG-style insert holders using clamp or screw holding methods. With 4 cutting edges per insert, it supports efficient cost-per-edge economics in high-volume turning cells. Licensed machinists and CNC programmers in metalworking shops are the typical end users.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear resistance and thermal protection
• 55-degree diamond insert shape with negative side clearance for rigid, stable cutting
• PM chip breaker geometry optimized for roughing and medium machining
• 4 cutting edges per insert for extended tool-life value
• Neutral hand orientation compatible with standard DNMG holder configurations
• 4425 grade balances high wear resistance with toughness for steel and cast iron

Compatibility

Designed for use in DNMG-style turning toolholders accepting clamp or screw holding methods. ANSI insert code DNMG442; ISO insert code DNMG150608. Compatible with holders designed for the T-Max P series. Primary workpiece material: steel (P); secondary workpiece material: cast iron (K).

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Before indexing or replacing inserts, power down the machine and engage all safety locks per the machine tool manufacturer's requirements. Use the appropriate torx or hex key to secure the clamping screw or top clamp to the torque specification listed in the toolholder documentation — no torque value is specified in this product data and none should be assumed. Inspect the insert pocket and seating surface for chips or debris before seating the new insert to ensure proper contact and runout.