Sandvik Coromant 7859178 Turning Insert CNMG642-QM 4415

Product Description

The SANDVIK COROMANT 7859178 is a CNMG-style indexable turning insert in the T-Max P series, designed for external turning operations on CNC lathes and turning centers. The insert is manufactured from solid carbide with a multi-layer CVD coating of TiCN, Al2O3, and TiN, providing wear resistance and thermal stability across a range of cutting speeds. It carries a neutral hand orientation and features an 80-degree diamond insert shape with a 0.79 mm corner radius, making it well suited for general-purpose profiling and facing. The insert is held by clamp or screw and is intended for use by machinists and toolroom professionals working in production environments.

This insert is rated for primary use on steel (ISO P) and secondary use on cast iron (ISO K), covering a broad range of turning applications in job shop and production machining settings. The QM chip breaker geometry is engineered for general-purpose turning across varying depths of cut and feed rates. The insert fits standard CNMG toolholders with a 3/4-inch inscribed circle and is packaged individually, with a minimum order quantity of 10 pieces per order.

Key Features

• Multi-layer CVD coating: TiCN, Al2O3, and TiN for wear resistance and thermal protection
• 80-degree diamond insert shape (Insert Shape Code: C) with 4 cutting edges per insert
• 0.79 mm (0.0313 inch) corner radius for general-purpose profiling and facing
• QM chip breaker geometry for consistent chip control across a range of feeds and depths
• Neutral hand orientation compatible with standard CNMG toolholder configurations
• Clamp and screw holding method for secure seating under high cutting forces

Compatibility

Designed as an OEM-style replacement for standard CNMG 19 06 08 toolholders with a 3/4-inch inscribed circle. ISO code CNMG 19 06 08-QM 4415. Compatible with toolholders using clamp or screw insert retention. Verify toolholder pocket tolerance and clearance angle before installation.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians familiar with indexable insert tooling. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torque wrench per toolholder manufacturer specifications when tightening clamping screws. Inspect the insert pocket and seating surface for chips or debris before seating a new insert to avoid insert rocking or premature edge failure.