Sandvik Coromant 7861000 TNMG1604 Turning Insert T-max P

Product Description

The SANDVIK COROMANT 7861000 is a TNMG1604 12-PR 4425 grade turning insert designed for external and internal turning operations in CNC and manual lathe applications. This triangular insert features a 60-degree included angle and a CVD-applied multilayer coating of TiCN, Al2O3, and TiN over a solid carbide substrate, producing a wear-resistant surface well suited to interrupted and continuous cuts. The 4425 grade targets steel as its primary workpiece material and cast iron as a secondary application. With six usable cutting edges per insert, it delivers extended tool life and a favorable cost-per-edge ratio for high-volume turning programs.

This insert fits within the T-Max P series and is compatible with TNMG-style toolholders using clamp or screw holding methods. It is most commonly applied in production turning of carbon steel, alloy steel, and gray cast iron components. The PR chip breaker geometry is suited for medium to finishing passes where chip control and surface quality are priorities. Typical users include CNC machinists, tool-and-die shops, and production turning operations running P-category and K-category workpiece materials.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for thermal resistance and flank wear reduction
• 6 cutting edges per insert for a low cost-per-edge in production environments
• PR chip breaker geometry optimized for medium to finish turning passes
• Neutral hand orientation for flexible toolholder compatibility
• 4425 grade rated primarily for steel (ISO P) and secondarily for cast iron (ISO K)
• Clamp and screw holding compatible for secure seating in T-Max P toolholders

Compatibility

Designed for use in TNMG-style toolholders within the SANDVIK COROMANT T-Max P series. ISO code TNMG 16 04 12-PR 4425; manufacturers catalog number TNMG 333-PR 4425. Compatible with clamp and screw insert holding methods.

Installation Notes

Installation is performed by CNC machinists or toolroom technicians. Power down the machine and lock the spindle before seating or replacing inserts. Ensure the insert pocket is clean and free of chips before installation to achieve proper seating and prevent premature edge failure. Follow the toolholder manufacturer torque guidelines for the clamping screw to avoid insert cracking or pocket damage.