Sandvik Coromant 7859087 Turning Insert CCMT32.51-WF 4415

Product Description

The SANDVIK COROMANT 7859087 is a CCMT-style turning insert from the CoroTurn 107 series, designed for precision external turning operations on CNC and manual lathes. It is manufactured from solid carbide with a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides thermal resistance and wear protection across a broad range of cutting conditions. The insert features an 80-degree diamond shape, a 9.53 mm (0.1732 inch) inscribed circle, and a 0.40 mm (0.0156 inch) corner radius. With a neutral hand orientation and WF chip breaker geometry, it is suited for finishing and light roughing passes. Licensed machinists and CNC operators install this insert in compatible toolholders for production and job-shop turning applications.

This insert is engineered primarily for turning steel (ISO material group P) and cast iron (ISO material group K) in both residential shop and industrial production environments. The WF chip breaker geometry promotes reliable chip evacuation during finishing cuts at moderate feed rates. The insert is held in place by clamp or screw methods, making it compatible with standard CCMT-style toolholders. Typical applications include shaft turning, bore facing, and general external profiling where a consistent surface finish and tight dimensional tolerance are required. The ISO designation for this insert is CCMT 09 T3 04-WF 4415.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for extended tool life on steel and cast iron
• 80-degree diamond insert shape (shape code C) for versatile approach angles
• WF chip breaker geometry optimized for finishing and light roughing cuts
• Neutral hand orientation fits left- and right-hand toolholder setups
• Two cutting edges per insert for cost-effective use
• Clamp and screw holding methods supported for secure seating in the toolholder pocket

Compatibility

Designed for use in CCMT-style toolholders compatible with the CoroTurn 107 series. Primary workpiece material is steel (ISO code P); secondary workpiece material is cast iron (ISO code K). Insert size code is 09T3. Confirm toolholder pocket dimensions and insert seating tolerance before installation.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician with the machine powered down and the spindle fully stopped before changing inserts. Use the appropriate torque wrench or hex key specified by the toolholder manufacturer when tightening the clamp screw — do not over-tighten, as this can fracture the carbide insert. Inspect the toolholder pocket and locating surfaces for chips or debris before seating the insert. Verify insert orientation and chip breaker alignment with the intended cutting direction before resuming machine operation.