Sandvik Coromant 8020991 Turning Insert Cpmt-pm 4415

Product Description

The SANDVIK COROMANT 8020991 is a CPMT-style turning insert in grade 4415, designed for precision metal cutting on CNC lathes and turning centers. This insert features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides wear resistance, thermal protection, and crater resistance across a range of workpiece materials. The insert has a 0.375 inch inscribed circle, a 0.0313 inch corner radius, and a 0.1563 inch thickness. It is neutral-hand and carries the PM chip breaker geometry, making it well suited for medium machining conditions. Licensed machinists and CNC turning specialists are the primary installers.

This insert is used in external turning and profiling applications on CNC lathes and turning centers in both production shop and job-shop environments. The CPMT form factor is held by clamp or screw, allowing fast indexing during high-volume runs. The 4415 grade with CVD coating is particularly effective on cast iron and similar secondary workpiece materials classified under ISO code K. The CPMT-PM series is a common choice for medium-depth cuts requiring a controlled chip break and consistent surface finish.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear and thermal resistance
• Grade 4415 substrate suited for medium machining of cast iron and K-group materials
• 0.375 inch inscribed circle with 0.0313 inch corner radius for defined edge geometry
• PM chip breaker geometry for controlled chip flow in medium cutting conditions
• Neutral hand — compatible with right-hand and left-hand toolholders designed for CPMT inserts
• Clamp or screw holding method for secure, repeatable seating in the toolholder pocket

Compatibility

Designed as an OEM-style replacement insert for CNC turning toolholders that accept CPMT-style inserts with a C insert shape, P clearance code, and M tolerance code, as specified by the ISO designation CPMT 09 T3 08-PM 4415.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully in the pocket and torque the clamp or screw according to the toolholder manufacturer's specification. Inspect the insert seat and pocket for chips or debris before each installation to ensure proper seating and edge geometry.