Sandvik Coromant 7860861 Turning Insert CCMT21.51-UF 4425

Product Description

The SANDVIK COROMANT 7860861 is a solid carbide turning insert in the CCMT style, designed for external turning operations on CNC lathes and turning centers. It carries the manufacturer designation CCMT 06 02 04-UF 4425 under ISO coding and belongs to the CoroTurn 107 series. The insert features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides wear resistance and thermal protection during continuous and interrupted cuts. With an 80-degree diamond shape, a 7-degree relief angle, a 0.25 inch inscribed circle, and a 0.40 mm corner radius, this insert is engineered for precision finishing passes. Installation and replacement are handled by licensed machinists and CNC operators.

This insert is primarily rated for steel (ISO material code P) as the primary workpiece material and cast iron (ISO material code K) as a secondary workpiece material. The UF chip breaker geometry is suited to light finishing cuts requiring tight chip control and close tolerances. It is a neutral-hand insert, making it usable in standard right-hand and left-hand toolholders that accept CCMT-style inserts held by clamp or screw. The CoroTurn 107 series is a common platform in production turning environments, and this insert fits within that system.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear resistance and heat management
• 80-degree diamond insert shape (shape code C) with 7-degree relief angle (clearance code C)
• 0.40 mm corner radius for finishing-quality surface results
• UF chip breaker geometry optimized for light finishing cuts on steel and cast iron
• Neutral hand orientation; compatible with clamp and screw holding methods
• ISO code CCMT 06 02 04-UF 4425 for cross-reference with standard toolholder catalogs

Compatibility

Designed for use in CCMT-style toolholders within the SANDVIK COROMANT CoroTurn 107 series. The insert accepts both clamp and screw holding methods. Verify toolholder pocket geometry against the CCMT insert style and the 0.25 inch inscribed circle dimension before installation. No additional compatible model numbers were specified in the product data.

Installation Notes

This insert is installed and replaced by qualified machinists or CNC setup technicians. Always power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torque tool for screw-held inserts to avoid cracking the carbide or stripping the seating screw. Inspect the pocket seat for chips or debris before seating a new insert, as contamination can cause premature edge failure or dimensional shift.