Sandvik Coromant 7860878 Turning Insert CCMT432-UR 4425

Product Description

The SANDVIK COROMANT 7860878 is a CCMT-style indexable turning insert from the CoroTurn 107 series, designed for external turning operations on CNC lathes and turning centers. It carries manufacturer grade 4425 with a multilayer CVD coating of TiCN, Al2O3, and TiN, delivering wear resistance and thermal stability during continuous and semi-interrupted cuts. The insert features an 80-degree diamond shape, a 0.5-inch inscribed circle, a 0.79 mm corner radius, and a neutral hand orientation. The UR chip breaker geometry is engineered primarily for steel machining and is suitable for use on cast iron as well. Machinists and CNC operators install this insert into compatible CCMT toolholders as a direct indexable replacement.

This insert is suited for turning steel (ISO P workpiece material) as the primary application and cast iron (ISO K) as a secondary application. It fits standard CCMT 432 toolholders used in production turning environments, including roughing and finishing passes where controlled chip formation and consistent tool life are priorities. The CoroTurn 107 series is commonly found in both job-shop and high-volume production settings on conventional and CNC turning equipment.

Key Features

• Grade 4425 with CVD-applied TiCN, Al2O3, and TiN multilayer coating for extended tool life on steel
• 80-degree diamond insert shape (CCMT) with 7-degree relief angle for positive-rake turning
• 0.79 mm (0.0313 inch) corner radius for balanced edge strength and surface finish
• UR chip breaker geometry optimized for steel turning with ISO P primary rating
• Two cutting edges per insert; neutral hand for versatile toolholder compatibility
• Screw and clamp holding method compatible with standard CCMT insert seats

Compatibility

Designed for use in CCMT 432 (ISO: CCMT 12 04 08) toolholders that accept clamp or screw insert holding. Primary workpiece material is steel (ISO P); secondary workpiece material is cast iron (ISO K). Refer to the CoroTurn 107 toolholder selection guide for confirmed holder compatibility.

Installation Notes

This insert is installed by qualified machinists or CNC operators following standard indexable insert change procedures. Power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torque wrench and insert screw specified for the toolholder to avoid seat damage or insert fracture. Inspect the insert seat and clamping hardware for wear or debris before seating a new insert.