Sandvik Coromant 7859225 Turning Insert CNMG542-PM 4415

Product Description

The SANDVIK COROMANT 7859225 is a solid carbide turning insert in the CNMG form factor, designed for precision metal cutting on CNC lathes and turning centers. Part of the T-Max P series, this insert carries a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides thermal resistance and wear protection during continuous and interrupted cuts. It features an 80-degree diamond shape with a 0.79 mm corner radius and a neutral hand orientation. The PM chip breaker geometry is optimized for productive turning at moderate to high feed rates in steel and cast iron applications. Machinists and CNC operators working in production turning environments will find this insert suited to reliable, repeatable cutting performance.

This insert is intended for external turning, facing, and profiling operations on CNC lathes and turning centers. The primary target workpiece material is steel (ISO P), with cast iron (ISO K) as the secondary application. The T-Max P series is widely used in production machining shops handling medium to roughing-depth cuts. The PM chip breaker suits applications where chip control and consistent surface finish are priorities at moderate cutting parameters.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for extended tool life in steel and cast iron
• 80-degree diamond insert shape (CNMG) with neutral hand orientation for versatile turning setups
• 0.79 mm corner radius (0.0313 inches) for a balance of edge strength and surface finish
• PM chip breaker geometry optimized for moderate to high feed rates
• 4 available cutting edges per insert for cost-effective tooling use
• Compatible with clamp and screw insert holding methods

Compatibility

Designed for use in CNMG-style toolholders accepting a 5/8-inch (15.88 mm) inscribed circle insert with a 0.250-inch hole diameter and 0.250-inch insert thickness. Suitable for toolholders specifying CNMG 16 06 08 inserts per ISO code. Verify toolholder seating and clamp compatibility before installation.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians following standard insert indexing procedures. Ensure the machine spindle is fully stopped and all power is locked out before changing or indexing inserts. Seat the insert firmly against the pocket stop and verify the clamp or screw is torqued per the toolholder manufacturer's specification. Inspect the insert pocket for wear or debris before seating a new cutting edge.