Sandvik Coromant 7860866 Turning Insert CCMT32.51-UM 4425

Product Description

The SANDVIK COROMANT 7860866 is a CCMT-style solid carbide turning insert designed for external and internal turning operations on CNC lathes and turning centers. Manufactured under the CoroTurn 107 series, this insert carries a CVD-applied multilayer coating of TiCN, Al2O3, and TiN — a combination engineered to resist built-up edge on steel and cast iron workpieces. The 80-degree diamond shape (Insert Shape Code C) provides a strong cutting edge geometry, while the UM chip breaker controls chip flow across a broad range of depths and feed rates. It holds a 9.53 mm inscribed circle and a 0.4 mm corner radius, fitting CCMT 09 T3 toolholders. Installation and indexing are handled by machinists and CNC operators in production and job-shop environments.

This insert is suited for finishing and semi-finishing passes on steel (ISO P materials) and cast iron (ISO K materials) in both light production and high-mix turning setups. The neutral hand orientation makes it compatible with right-hand and left-hand toolholders that accept CCMT geometry inserts. The UM chip breaker geometry is optimized for moderate feed rates and varying depths of cut, making this insert practical across a wide range of part sizes and material conditions common in general machining. Two cutting edges are available per insert, supporting cost-effective indexing during tool changes.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear resistance on steel and cast iron
• 80-degree diamond insert shape (Code C) with strong nose geometry for reliable edge life
• UM chip breaker designed for moderate feeds and variable depths of cut
• 0.4 mm corner radius (0.0156 inch) for finishing and semi-finishing surface quality
• Two cutting edges per insert for indexed use and reduced tooling cost per edge
• Clamp and screw holding method compatible with CoroTurn 107 series toolholders

Compatibility

Designed for use in SANDVIK COROMANT CoroTurn 107 series toolholders accepting CCMT 09 T3 insert geometry. ISO code CCMT 09 T3 04-UM 4425. Compatible with toolholders designed for clamp and screw insert retention with CCMT-style inserts. Primary workpiece materials are steel (ISO P) and cast iron (ISO K).

Installation Notes

Insert indexing and seating should be performed by a qualified machinist or CNC operator with the machine in a full lockout/tagout state and spindle confirmed stationary. Inspect the insert pocket and clamping components for debris or wear before seating a new insert. Use the correct torque wrench and manufacturer-specified fasteners when securing clamp or screw retention — do not overtighten or substitute hardware. Confirm insert orientation matches the neutral-hand designation of the toolholder before resuming cutting operations.