Korloy CCMT120404-C25 NC3120 High-Speed Steel Turning Insert (10pcs)
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The Original Korloy CCMT120404-C25 NC3120 (ANSI Standard: CCMT 431) is a premium CVD-coated carbide insert specifically engineered for high-speed precision finishing of steel. The combination of the rigid size-12 substrate and the razor-sharp C25 chipbreaker allows for exceptional chip control and surface integrity on carbon steels and alloy steels. If you are looking to maintain tight tolerances and achieve a high-gloss finish on larger workpieces, the NC3120 grade is your ideal choice.
Steel Expert: NC3120 features an advanced thick CVD alumina coating, providing superior heat resistance and tool life in high-speed dry or wet machining.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CCMT120404-C25 |
| ANSI Code | CCMT 431 |
| Grade | NC3120 (CVD Coating for Steel) |
| Chipbreaker | C25 (Precision Fine Finishing) |
Core Performance Benefits:
- Optimized for High Speed: The NC3120 CVD coating allows for much higher cutting speeds (Vc) compared to PVD grades, boosting productivity in stable setups.
- C25 Sharp Geometry: Designed with a positive rake angle to reduce cutting force and heat, preventing tool deflection and vibration in precision boring.
- Rigid Size-12 Substrate: Provides maximum stability for larger tool holders, ensuring consistent performance in heavy-duty shop environments.
- Superior Wear Resistance: Resists crater wear and thermal cracking, ensuring a long and predictable tool life in carbon and alloy steels.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045 / S45C) | 180 - 350 m/min | 0.05 - 0.20 mm/rev | 0.2 - 1.5 mm |
| Alloy Steel (4140 / SCM440) | 150 - 300 m/min | 0.05 - 0.15 mm/rev | 0.2 - 1.2 mm |
Compatible Tool Holders:
For maximum precision with CCMT 12 size inserts, use high-rigidity SCLCR/L holders:
- External Turning: SCLCR2020K12 / SCLCR2525M12
- Boring Bars (Internal): S25S-SCLCR12 / S32T-SCLCR12
Steel Grade Selection: NC3120 vs. NC3225
Choosing the best CVD grade for steel turning:
Best for high-speed continuous finishing. Exceptional wear resistance in stable conditions.
Primary choice for general turning and interrupted cuts. More robust in unstable machines.
Machinist's Tip: If your machine can handle higher RPMs and the cut is continuous, NC3120 will give you a significant boost in tool life over general-purpose grades.
Packaging: 10 pieces per box.