Sandvik Coromant 7859057 Turning Insert Coroturn 107

Product Description

The SANDVIK COROMANT 7859057 is a solid carbide turning insert in the CoroTurn 107 series, designed for external and internal turning operations on CNC lathes and turning centers. It features a 55-degree diamond insert shape (DCMX style) with a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, providing wear resistance and thermal protection during moderate to heavy cutting. The 0.79 mm corner radius and WF chip breaker geometry support controlled chip formation on steel and cast iron workpieces. This insert is used by machinists and CNC operators in production and job shop environments.

This insert is rated primarily for steel (ISO material code P) and secondarily for cast iron (ISO material code K). The WF chip breaker geometry is suited for light to medium finishing passes where chip control is critical. The neutral hand orientation accommodates a wide range of toolholder configurations. Typical installation is in DCMX-compatible CoroTurn 107 toolholders using clamp or screw holding methods, making it a common choice for precision turning on production lines and automated cells.

Key Features

• CVD multilayer coating: TiCN plus Al2O3 plus TiN for extended tool life on steel and cast iron
• 55-degree diamond insert shape (Insert Shape Code: D) with 2 cutting edges
• 0.79 mm corner radius for finishing and semi-finishing applications
• WF chip breaker geometry for reliable chip control at light to medium depths of cut
• Neutral hand orientation compatible with a broad range of DCMX toolholders
• Clamp and screw holding method for secure seating in CoroTurn 107 toolholders

Compatibility

Designed for use with CoroTurn 107 series DCMX-compatible toolholders. ISO designation DCMX 11 T3 08-WF 4415. Compatible holding methods include clamp and screw. Verify toolholder seat and insert pocket specifications before installation.

Installation Notes

Installation is performed by qualified CNC machinists or tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torx or hex key to the toolholder manufacturer's specified procedure when securing the clamping screw. Inspect the insert pocket and seating surface for chips or debris before seating the new insert to ensure proper contact and repeatable tool nose position.