Korloy CNMG190612-GR NC3120 Heavy Roughing Insert, Steel & Cast Iron (10pcs)
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The Original Korloy CNMG190612-GR NC3120 (ANSI Standard: CNMG 643) is a high-performance turning insert engineered for aggressive roughing of both Steel (P) and Cast Iron (K). This oversized 1906-size insert is the industrial standard for large-scale components, offering a 6.35mm thickness and a 1.2mm radius for exceptional edge strength. The GR chipbreaker is specialized for heavy material removal (MRR), while the NC3120 grade provides a superior balance between high-speed wear resistance and impact toughness.
Superior Versatility: NC3120 is the go-to grade for heavy-duty workshops. It excels in diverse conditions, providing stable tool life when transitioning between carbon steel, alloy steel, and ductile cast iron workpieces.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG190612-GR |
| ANSI Code | CNMG 643 |
| Grade | NC3120 (General Purpose Heavy Duty CVD) |
| Nose Radius | 1.2 mm (Optimized Roughing Strength) |
Core Performance Benefits:
- Extreme Metal Removal: The GR chipbreaker allows for massive depths of cut, significantly shortening cycle times on large parts.
- Reinforced Cutting Edge: The 1.2mm radius provides a robust T-land structure to prevent chipping under high cutting pressure.
- Advanced CVD Coating: Thick thermal barrier allows for stable machining even during high-heat dry cutting operations.
- Structural Rigidity: The 19mm size ensures maximum contact with the tool holder, minimizing vibration during heavy passes.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (P) | 140 - 260 m/min | 0.35 - 0.75 mm/rev | 4.0 - 9.0 mm |
| Ductile Cast Iron (K) | 130 - 230 m/min | 0.40 - 0.85 mm/rev | 3.5 - 8.5 mm |
| Alloy Steel (Pre-hardened) | 110 - 190 m/min | 0.30 - 0.65 mm/rev | 3.0 - 8.0 mm |
Compatible Tool Holders:
Due to the immense torque of 1906 series inserts, heavy-duty clamping is required:
- External Turning: PCLNR/L 3232P19 / PCLNR/L 4040R19
The Roughing Professional's Guide: NC3120 vs. NC3020
Choosing the right coating for your heavy-duty CNMG 643:
Optimized for both steel and cast iron. It is tougher than NC3020, making it ideal for large parts where the material consistency might vary.
Best for continuous high-speed steel turning. It offers higher wear resistance but is more susceptible to chipping on cast iron or interrupted cuts.
Machinist's Pro Tip: If your job involves a mix of steel forgings and large cast iron components, NC3120 is your best economic choice to reduce inventory while maintaining elite performance.
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.