Korloy CNMG120404-HA NC3120 Sharp Steel Finishing Insert (10pcs)
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The Original Korloy CNMG120404-HA NC3120 (ANSI Standard: CNMG 431) is a specialized turning insert designed for steel finishing in challenging conditions. By combining the ultra-sharp HA chipbreaker with the high-toughness NC3120 CVD coating, Korloy has created a tool that reduces cutting forces while surviving the mechanical shocks of interrupted cuts. It is the go-to solution for 1018, 1045, and A36 steels, especially when machining thin-walled parts or working on older, less stable CNC machines.
Toughness Specialist: The NC3120 grade features a thick Al2O3 coating layer that provides superior resistance to chipping and thermal shock, outperforming standard finishing grades in interrupted applications.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-HA |
| ANSI Code | CNMG 431 |
| Grade | NC3120 (CVD Coating for Tough Steel Machining) |
| Nose Radius | 0.4 mm (1/64") - Precision Finish |
Core Performance Benefits:
- Interrupted Cut Stability: NC3120 grade is specifically engineered to handle the impact of cross-holes, splines, or uneven surfaces without edge failure.
- Reduced Workpiece Deflection: The high-positive HA rake angle ensures a clean shearing action, reducing the pressure on thin workpieces.
- Exceptional Surface Finish: Prevents "tearing" and built-up edge (BUE) in gummy, low-carbon steels, resulting in a mirror-like shine.
- High Heat Resistance: Thick CVD coating allows for higher cutting speeds (Vc) compared to uncoated or PVD alternatives in steel.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel (Interrupted) | 150 - 280 m/min | 0.05 - 0.20 mm/rev | 0.2 - 2.0 mm |
| Mild Steel (A36 / 1018) | 180 - 320 m/min | 0.08 - 0.18 mm/rev | 0.2 - 2.5 mm |
| Forged Steel Parts | 140 - 250 m/min | 0.10 - 0.20 mm/rev | 0.5 - 2.0 mm |
Compatible Tool Holders:
Maintain precision with high-rigidity D-Type or M-Type holders:
- External Turning: MCLNR/L 2020K12 / MCLNR/L 2525M12
- Precision Boring Bars: S25S-MCLNR12 / S32T-MCLNR12
Pro Tip: NC3120 vs. NC3020 for Steel Finishing
Which Korloy grade is best for your current setup?
Best for interrupted cuts or unstable vibration-prone setups. The safety first choice for steel turning.
Best for continuous high-speed turning. Offers better wear resistance but is more susceptible to chipping if impact occurs.
Machinist's Insight: If your part has a cross-hole or keyway, the NC3120 + HA combination is a lifesaver. The sharp edge keeps the cut clean, while the grade toughness prevents the tip from snapping on impact.
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.