Korloy CNMG190612-GR NC3020 Heavy-Duty Steel Roughing Insert (10pcs)
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The Original Korloy CNMG190612-GR NC3020 (ANSI Standard: CNMG 643) is a premier solution for heavy-scale industrial steel turning. As one of the largest standard inserts available, the 1906 series offers the massive structural integrity and thermal mass needed to withstand extreme cutting forces on large CNC lathes. The GR (Heavy Roughing) chipbreaker features a highly reinforced cutting edge designed to plow through heavy depths of cut, while the NC3020 CVD coating provides the wear resistance required for sustained high-speed operations in carbon and alloy steels.
Engineered for Scale: The CNMG1906 series is designed for heavy-duty machines where standard 12mm or 16mm inserts would fail due to excessive heat or mechanical stress. This is the professional's choice for maximizing Material Removal Rate (MRR).
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG190612-GR |
| ANSI Code | CNMG 643 |
| Grade | NC3020 (CVD - High Efficiency Steel Grade) |
| Insert Thickness | 6.35 mm (Heavy Duty) |
Core Performance Benefits:
- Extreme Metal Removal: The GR chipbreaker allows for massive depths of cut (ap) and aggressive feed rates, significantly reducing cycle times on large parts.
- Superior Heat Dissipation: The large carbide volume effectively sinks heat away from the cutting edge, prolonging tool life during long, continuous cuts.
- Stable Edge Geometry: Reinforced T-land design prevents edge chipping when encountering hard spots or uneven surfaces on steel castings and forgings.
- High-Velocity Coating: NC3020's advanced CVD layer is optimized for higher cutting speeds, boosting overall factory productivity.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Medium Carbon Steel | 150 - 280 m/min | 0.35 - 0.85 mm/rev | 4.0 - 10.0 mm |
| Alloy Steel (Continuous) | 130 - 240 m/min | 0.30 - 0.70 mm/rev | 3.5 - 8.0 mm |
| Soft / Mild Steel | 180 - 320 m/min | 0.40 - 0.90 mm/rev | 4.0 - 11.0 mm |
Compatible Tool Holders:
Due to the 1906 size, this insert must be used with 19-series heavy-duty holders for adequate support:
- External Turning: PCLNR/L 3232P19 / PCLNR/L 4040R19
Roughing Choice: NC3020 vs. NC3030
Selecting the right grade for your large-scale steel turning:
Best for continuous heavy roughing at higher speeds. It offers superior wear resistance and long tool life on stable setups.
Best for heavy interrupted cuts or parts with high vibration. It prioritizes toughness over speed to prevent sudden tool breakage.
Pro Tip: When using the GR chipbreaker on a 1906 insert, ensure your machine has sufficient horsepower. If you experience excessive vibration, try reducing the depth of cut while maintaining a high feed rate.
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.