Korloy CNMG120408-VM NC3120

The CNMG 120408-VM NC3120 is a negative-type 80° diamond insert with a 12.7 mm inscribed circle and 0.8 mm corner radius. Its VM chipbreaker is designed for balanced cutting performance — combining smooth chip evacuation with strong edge integrity.
The insert’s NC3120 grade features a high-toughness carbide substrate coated with a multi-layer Al₂O₃-TiCN CVD coating, providing outstanding heat resistance and oxidation stability for longer tool life at higher cutting speeds.

• Optimized for steel machining (P20–P35 range)
  Handles carbon steels, alloy steels, and medium cast iron with ease — both continuous and slightly interrupted cuts.

• VM Chipbreaker Design

  • Controlled chip flow for stable cutting and easy evacuation.

  • Strong edge design prevents chipping and breakage under variable loads.

  • Ideal for medium to roughing applications with consistent surface finish.

• NC3120 Grade with Advanced CVD Coating

  • Multi-layer coating provides superior wear resistance and oxidation control.

  • Excellent adhesion between substrate and coating prevents flaking.

  • Maintains sharp cutting edge integrity at high cutting temperatures.

• Extended Tool Life

  • Engineered substrate with high fracture resistance ensures durability during interrupted or heavy cuts.

  • Reduces tool changes and downtime — maximizing machine uptime and productivity.

• Stable Wear Behavior

  • Predictable flank wear and minimal crater wear ensure consistent performance across long runs.

  • Maintains dimensional accuracy and excellent surface finish.

The CNMG 120408-VM NC3120 is the go-to choice for general-purpose and production turning operations in:

• Automotive Manufacturing: Shafts, gear hubs, housings, connecting rods

• Aerospace & Defense: Steel structural parts, precision brackets

• Die & Mold Industry: Pre-machining of steel mold bases

• Heavy Engineering: Rollers, flanges, couplings, and large-diameter parts

• General Machining & Fabrication: Turning of medium carbon steels, tool steels, and mild cast iron

Its combination of high edge toughness + superior heat resistance makes it perfect for machining SCM440, S45C, EN8, EN19, and similar materials.

✅ Longer Tool Life – Up to 2× more parts per edge compared to conventional grades under identical cutting conditions.
✅ Fewer Insert Failures – Reliable cutting edge strength minimizes sudden chipping or breakage.
✅ Excellent Surface Finish – Consistent chip control results in smoother, more accurate finishes.
✅ Cost Efficiency – Reduced downtime and tool change frequency lower your cost per component.
✅ Versatile Performance – Works equally well in roughing and semi-finishing operations.

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