Sumitomo 19RBBYB Turning Insert CNMG432EGE AC830P Carbide

Product Description

The SUMITOMO 19RBBYB is a solid carbide turning insert designed for precision CNC lathe and turning center operations. It carries the ANSI designation CNMG432EGE and ISO code CNMG120408N-GE, manufactured in grade AC830P with a CVD-applied aluminum oxide (Al2O3) coating. The diamond-shaped insert features an 80-degree included angle, a neutral hand orientation, and a 1/32-inch corner radius, making it suited for medium to general-purpose turning passes. The Al2O3 coating improves thermal and chemical wear resistance at elevated cutting speeds. Licensed machinists and CNC programmers working in production turning environments are the primary users of this insert.

The 19RBBYB is intended for use in turning operations targeting universal and multi-material workpiece classifications, with secondary workpiece material codes M and P, covering steel and stainless steel stock. It is sized for toolholders accepting CNMG-style inserts with a 1/2-inch inscribed circle and a 3/16-inch insert thickness. The EGE chip breaker geometry with a positive rake angle of 3 degrees supports controlled chip formation during continuous or light interrupted cuts. This insert is packaged individually and must be ordered in multiples of 10.

Key Features

• CVD-applied Al2O3 coating for elevated thermal and wear resistance at high cutting speeds
• AC830P carbide grade engineered for steel and stainless steel turning applications
• 80-degree diamond insert shape (CNMG style) with neutral hand orientation
• EGE chip breaker geometry with positive 3-degree rake for controlled chip evacuation
• 1/32-inch corner radius balances edge strength and surface finish requirements
• Compliant with ANSI and ISO 13399 insert standards for toolholder interchangeability

Compatibility

Designed for use in CNMG-style turning toolholders accepting a 1/2-inch inscribed circle insert. Compatible with clamp and pin insert-holding methods. Workpiece material compatibility covers material codes M (stainless steel) and P (steel) per ISO classification.

Installation Notes

Installation is performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully in the toolholder pocket and secure with the appropriate clamp and pin before resuming operation. Do not exceed the insert manufacturer recommended cutting parameters for the AC830P grade when programming feed and speed values.