Sandvik Coromant 7860827 Turning Insert CCMT32.52-PR 4425

Product Description

The SANDVIK COROMANT 7860827 is a solid carbide turning insert in the CCMT style, designed for external turning operations on CNC and manual lathes. This insert carries the grade designation 4425 and features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides wear resistance and thermal stability across a broad range of cutting conditions. With an 80-degree diamond shape, a 9.53 mm inscribed circle, and a 0.79 mm corner radius, it is engineered for productive machining of steel and cast iron. The neutral hand orientation makes it suitable for both right-hand and left-hand toolholders within the CoroTurn 107 series. Licensed trade machinists and CNC operators install this insert in standard CCMT-compatible toolholders.

This insert is part of the CoroTurn 107 series and is primarily targeted at turning steel workpieces, with secondary suitability for cast iron. The CCMT geometry with a PR chip breaker promotes controlled chip formation during general-purpose external turning, profiling, and finishing cuts. The two cutting edges per insert contribute to consistent cost-per-edge economics in production environments. Typical applications include medium to light finishing passes where dimensional accuracy and surface finish are priorities.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for extended tool life on steel and cast iron
• 80-degree diamond insert shape (C shape code) for versatile turning and profiling
• 0.79 mm corner radius for a balance of edge strength and surface finish capability
• PR chip breaker geometry optimized for controlled chip evacuation
• Neutral hand orientation compatible with standard CCMT CoroTurn 107 toolholders
• Two cutting edges per insert for efficient cost-per-edge use

Compatibility

Designed for use with CoroTurn 107 series toolholders that accept CCMT-style inserts. Compatible with clamp and screw insert-holding methods. ISO code CCMT 09 T3 08-PR 4425. Manufacturers catalog number CCMT 3(2.5)2-PR 4425. Suited for primary workpiece material Steel (ISO P) and secondary workpiece material Cast Iron (ISO K).

Installation Notes

Installation is performed by qualified machinists following standard insert-change procedures for CCMT screw-on or clamp-style toolholders. Power down and de-energize the machine before changing inserts. Ensure the insert seat and shim are clean and free of chips before seating the new insert to prevent improper seating and edge chipping. Follow the toolholder manufacturer torque and clamping guidelines for the specific CoroTurn 107 holder in use.