Korloy CNMG120404-HA NC3020 Steel Turning Insert, Sharp Edge (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy CNMG120404-HA NC3020 (ANSI Standard: CNMG 431) is a unique high-performance insert combining an ultra-sharp geometry with a heavy-duty CVD coating. While the HA chipbreaker is famous for its razor-sharp shearing action, the NC3020 grade provides the thermal stability and wear resistance needed for high-speed steel turning. This combination is the ultimate solution for low carbon steels, mild steels, and gummy alloy steels where maintaining a clean surface finish and preventing built-up edge is a challenge.
Machinist's Advantage: The HA geometry significantly reduces cutting forces and vibration, making it ideal for precision finishing on slender steel parts or machines with lower horsepower.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-HA |
| ANSI Code | CNMG 431 |
| Grade | NC3020 (Premium CVD Coated for Steel) |
| Chipbreaker | HA (High-Positive Sharp Edge) |
Core Performance Benefits:
- Extreme Sharpness: The HA rake angle shears through steel smoothly, preventing the "tearing" effect often seen in soft steel finishing.
- CVD NC3020 Coating: Provides superior protection against crater wear and high temperatures, allowing for higher cutting speeds (Vc).
- Low Cutting Force: Minimizes the risk of workpiece deflection, ensuring high dimensional accuracy on small or thin-walled parts.
- Superior Finish: Specifically designed to produce a bright, burr-free surface on 1018, 1045, and A36 steels.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel (1018/A36) | 180 - 350 m/min | 0.08 - 0.25 mm/rev | 0.2 - 2.5 mm |
| Medium Carbon Steel (1045) | 150 - 300 m/min | 0.10 - 0.20 mm/rev | 0.2 - 2.0 mm |
| Soft Alloy Steels | 140 - 280 m/min | 0.08 - 0.18 mm/rev | 0.2 - 1.5 mm |
Compatible Tool Holders:
For high-precision steel turning, we recommend rigid D-Type or M-Type holders:
- External Turning: PCLNR/L 2020K12 / PCLNR/L 2525M12
- Internal Boring Bars: S25S-PCLNR12 / S32T-PCLNR12
Steel Grade Tip: NC3020 vs. NC3120
Choosing the right Korloy steel grade for your finish:
The General Specialist. First choice for continuous cutting of carbon steel. Excellent balance of wear resistance and toughness.
The Interrupted Expert. Better suited for heavy interrupted cuts or machining forged steel with unstable surfaces.
Pro Tip: When using the HA chipbreaker on steel, keep your depth of cut relatively light. The sharpness is your biggest advantage for precision, but avoid heavy roughing to prevent premature edge wear.
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.