Korloy CNMG120412-HM NC3020 Heavy Roughing Steel Insert (10pcs)
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The Original Korloy CNMG120412-HM NC3020 (ANSI Standard: CNMG 433) is a powerhouse insert engineered for maximum metal removal rates (MRR) in steel turning. Featuring a robust 1.2mm (3/64") nose radius, this insert provides the ultimate edge strength required for heavy-duty roughing. The NC3020 CVD grade is optimized for high-speed wear resistance, making it the perfect choice for high-volume production of large carbon and alloy steel components.
Heavy Duty Tip: The R1.2 (1.2mm) radius is specifically designed for high-feed applications. It effectively dissipates heat and pressure, allowing for much deeper cuts than standard R0.4 or R0.8 inserts.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120412-HM |
| ANSI Code | CNMG 433 |
| Grade | NC3020 (High-Efficiency CVD Steel Grade) |
| Nose Radius | 1.2 mm (3/64") - Maximum Strength |
Core Performance Benefits:
- Maximum Edge Strength: The 1.2mm radius offers the highest resistance to edge breakage and thermal cracking during aggressive heavy-duty turning.
- High Productivity: Allows for significantly higher feed rates, drastically reducing cycle times on large diameter workpieces.
- Superior Wear Resistance: Thick CVD alumina coating enables high-speed machining (Vc) in continuous cuts without rapid tool degradation.
- HM Roughing Breaker: Specifically designed for large depths of cut, ensuring chips are curled and broken efficiently even at high material removal rates.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (AISI 1045) | 160 - 320 m/min | 0.30 - 0.65 mm/rev | 2.0 - 6.5 mm |
| Alloy Steel (AISI 4140) | 140 - 280 m/min | 0.25 - 0.55 mm/rev | 1.5 - 5.5 mm |
Compatible Tool Holders:
Heavy roughing requires maximum tool rigidity. Use high-performance D-Type or M-Type holders:
- External Turning: PCLNR/L 2525M12 / DCLNR/L 2525M12 / PCLNR/L 3232P12
- Heavy Boring Bars: S32T-PCLNR12 / S40T-PCLNR12 / S50U-PCLNR12
Roughing Guide: NC3020 vs. NC3030
Choosing the right grade for heavy-duty metal removal:
Higher hardness and wear resistance. Best for stable, continuous roughing at higher RPMs.
Maximum toughness. Best for heavily interrupted cuts, rough forge-skin, or unstable machine setups.
Machinist's Tip: Due to the large R1.2 radius, this insert will create higher radial cutting forces. Ensure your machine and workpiece are rigidly clamped to prevent vibration.
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.