Ingersoll Cutting Tools 5403039 Cbn Turning Insert CNGA431LS4

Product Description

The INGERSOLL CUTTING TOOLS 5403039 is a cubic boron nitride (CBN) turning insert in the CNGA series, designed for precision single-point turning of hardened steel workpieces. This uncoated, negative-rake insert features an 80-degree diamond shape with a 0.508-inch length, a 0.5-inch inscribed circle, and a 0.016-inch corner radius. With four usable cutting edges and a clamp-style holding method, it delivers consistent performance in demanding finishing and semi-finishing operations. The TB670 grade is engineered to handle the extreme heat and abrasion generated when machining hardened ferrous materials.

This insert is suited for CNC turning centers and lathes running hardened steel components in both production and job-shop environments. Typical applications include shaft finishing, bearing seat machining, and hard-turning operations where grinding has traditionally been required. The CNGA geometry and 0.102-inch maximum depth of cut make it appropriate for light to medium material removal on hardened workpieces. It is installed and changed by machinists and CNC operators following standard insert indexing procedures.

Key Features

• Cubic boron nitride (CBN) insert material for hardened steel hard-turning applications
• TB670 uncoated grade with bright finish, optimized for ferrous hardened workpiece materials
• 80-degree diamond insert shape with negative rake for strong cutting edge geometry
• Four indexable cutting edges per insert for extended tool life per unit
• 0.016-inch corner radius with LS4 chip breaker geometry for controlled chip formation
• Clamp-style insert holding method compatible with standard CNGA toolholders

Compatibility

Designed for use in CNGA-style turning toolholders. ISO equivalent designation is CNGA120404LS4 TB670. Primary workpiece material is hardened steel (ISO material group H). Insert size code is 431LS4.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's clamping torque and seating procedures. Power down and lock out the machine spindle before indexing or replacing inserts. Inspect the insert pocket and clamp for debris or wear before seating the new insert. Always verify insert orientation and edge condition before resuming cutting operations.