Korloy CNMG190608-GR NC3120 Universal Heavy Roughing Insert (10pcs)
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The Original Korloy CNMG190608-GR NC3120 (ANSI Standard: CNMG 642) is a versatile, large-format turning insert engineered for heavy roughing of both Steel (P) and Cast Iron (K). Measuring 19mm in edge length and 6.35mm in thickness, this insert provides the massive structural integrity required for heavy-duty CNC lathes. The GR chipbreaker is reinforced with a strong T-land for extreme stock removal, while the NC3120 grade features a specialized CVD coating that balances high-speed wear resistance with the toughness needed for general industrial applications.
Universal Heavy-Duty Performance: The NC3120 grade is the "General Purpose" powerhouse for large-scale turning. Whether you are roughing carbon steel shafts or large cast iron housings, this insert delivers stable tool life and excellent chip control.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG190608-GR |
| ANSI Code | CNMG 642 |
| Grade | NC3120 (Universal Steel & Cast Iron CVD) |
| Nose Radius | 0.8 mm (Low Cutting Force / Deep Cut) |
Core Performance Benefits:
- Optimized for Large MRR: The GR geometry is designed to plow through heavy material without overloading the machine's spindle.
- Dual-Material Capability: Excellent performance in both Steel (P25-P35) and Cast Iron (K20-K30).
- Vibration Control: The 0.8mm radius generates less radial pressure than larger radii, making it ideal for large-diameter parts with long overhangs.
- High Thermal Capacity: The oversized 1906 carbide body absorbs extreme heat during long, high-depth-of-cut roughing cycles.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (P) | 150 - 250 m/min | 0.30 - 0.65 mm/rev | 3.5 - 9.0 mm |
| Ductile Cast Iron (K) | 140 - 220 m/min | 0.35 - 0.70 mm/rev | 3.0 - 8.0 mm |
| Alloy Steel (Medium) | 120 - 200 m/min | 0.25 - 0.55 mm/rev | 2.5 - 7.5 mm |
Compatible Tool Holders:
To support the intense loads of a CNMG 1906 insert, use Heavy-Duty 19-series holders:
- External Turning: PCLNR/L 3232P19 / PCLNR/L 4040R19
Grade Choice: NC3120 vs. NC3030
Which toughness level is right for your large-scale project?
Best for stable roughing of steel and cast iron. It is the most versatile grade for shops processing various large industrial materials.
Reserved for heavy interrupted cuts or parts with extreme forging skin. NC3030 prioritizes edge survival over cutting speed.
Machinist's Insight: For most general roughing tasks on large CNC lathes, NC3120 is the optimal starting point. It offers better wear resistance than NC3030 while remaining tough enough for semi-stable conditions.
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.