Sandvik Coromant 7859090 Turning Insert CCMT32.52-PR 4415

Product Description

The SANDVIK COROMANT 7859090 is a solid carbide turning insert designed for external and internal turning operations on CNC lathes and turning centers. It carries a CVD-applied multilayer coating of TiCN, Al2O3, and TiN under the grade designation 4415, targeting steel and cast iron workpiece materials. The insert follows the CCMT geometry with an 80-degree diamond shape, a 7-degree relief angle, and a 0.79 mm (0.0313 inch) corner radius. It belongs to the CoroTurn 107 series and is held by clamp or screw. This insert is installed by machinists and CNC turning specialists in production and job-shop environments.

This insert is suited for medium to semi-finish turning passes on steel (ISO P) as the primary workpiece material, with cast iron (ISO K) as the secondary application. The PR chip breaker geometry promotes efficient chip control across a range of depths of cut and feed rates typical of precision turning work. It is sized at a 3/8 inch (9.53 mm) inscribed circle with an insert thickness of 0.1563 inches (3.97 mm), fitting toolholders designed for the CCMT 09T3 insert size. Typical use cases include shaft turning, shoulder turning, and contour operations on CNC turning centers in both production and repair machining.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear resistance and thermal stability on steel and cast iron
• 80-degree diamond insert shape (CCMT) provides a strong cutting edge with good versatility for straight and contour turning
• 0.79 mm corner radius (0.0313 inch) balances surface finish quality with edge strength
• PR chip breaker promotes reliable chip control on medium to semi-finish turning cuts
• Neutral hand orientation — compatible with both right-hand and left-hand toolholder setups
• Clamp and screw holding method for secure, repeatable insert seating

Compatibility

Designed for use in CoroTurn 107 series toolholders accepting CCMT 09T3 inserts with a 4.40 mm (0.1732 inch) hole diameter. ISO code CCMT 09 T3 08-PR 4415. Compatible with steel (ISO P) and cast iron (ISO K) workpiece materials.

Installation Notes

Insert replacement and toolholder service should be performed by a qualified machinist with the machine in a fully stopped and locked-out state per applicable machine safety procedures. Use the correct Torx or hex key to the toolholder manufacturer's specified seating method when securing the clamp or screw. Inspect the insert pocket and seating surface for chips or debris before seating a new insert to ensure proper contact and prevent edge chipping. Handle carbide inserts carefully — carbide is brittle and edges can micro-chip if dropped or impacted.