Korloy CCMT120404-C25 NC3120 High-Speed Steel Turning Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
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.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.