Iscar 5550239 CNMG321TF IC8150 Turning Insert Isoturn

Product Description

The ISCAR 5550239 is a CNMG321TF-style solid carbide turning insert in the IC8150 grade, designed for precision external and internal turning operations on CNC lathes and turning centers. The insert features a CVD-applied TiCN and Al2O3 multilayer coating that provides wear resistance and thermal stability during continuous and interrupted cuts. At 9.70 mm in length with a 3/8-inch inscribed circle and a 1/64-inch corner radius, this 80-degree diamond-shaped insert suits moderate to heavy stock removal. Positive rake geometry and the TF chip breaker promote controlled chip flow and reduce cutting forces on the workpiece. Holding is secured via clamp and pin for rigid, repeatable seating.

This insert is intended for turning ferrous materials, with a primary workpiece designation of P-class steels and a secondary designation of K-class cast irons, following ISO material classification. It is suited for production turning environments - aerospace, automotive, and general machining shops - where consistent surface finish and tool life across multiple passes are required. The Isoturn series designation indicates compatibility with ISCAR Isoturn toolholders that accept CNMG insert styles. Licensed machinists and CNC operators are the typical end users for this insert type.

Key Features

• IC8150 CVD-coated grade with TiCN and Al2O3 layers for extended wear resistance at elevated cutting temperatures
• 80-degree diamond insert shape (CNMG) with positive rake for reduced cutting force and clean chip formation
• TF chip breaker geometry designed for efficient chip control during steel and cast iron turning
• 1/64-inch corner radius suitable for moderate finishing and semi-finishing passes
• Clamp and pin holding method for secure, repeatable insert indexing
• Compliant with ISO 13399 cutting tool data representation standards

Compatibility

Designed for use in ISCAR Isoturn series toolholders accepting CNMG-style inserts with a 3/8-inch inscribed circle. Primary workpiece materials are P-class steels; secondary compatibility includes K-class cast irons per ISO material classification codes.

Installation Notes

Installation of turning inserts should be performed by a qualified machinist or CNC tooling technician with the machine in a stopped, de-energized state and all rotating elements fully at rest. Use the appropriate torx or hex key specified by the toolholder manufacturer to secure the clamp and pin - do not over-torque the clamping screw. Inspect the insert pocket for chips or debris before seating the insert, and verify positive engagement of the locating pin before resuming operation. Index or replace the insert at the first sign of edge wear to prevent workpiece damage or uncontrolled chip formation.