Korloy CNMG190616-GR NC3020 Heavy Roughing Steel Insert, R1.6 (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy CNMG190616-GR NC3020 (ANSI Standard: CNMG 644) is the absolute powerhouse for large-scale industrial steel roughing. Designed for heavy-duty CNC lathes, the 1906 size offers maximum structural integrity with a 6.35mm thickness. The 1.6mm (1/16") nose radius provides the ultimate reinforcement for the cutting edge, allowing for extreme feed rates and deep passes without the risk of chipping. Paired with the NC3020 CVD grade, this insert maximizes metal removal rates (MRR) in stable high-speed turning environments.
Maximum Material Removal: The combination of the GR (Heavy Roughing) geometry and the R1.6 radius allows this insert to "plow" through material that would shatter standard 12mm or 16mm inserts, making it essential for heavy energy and marine engineering.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG190616-GR |
| ANSI Code | CNMG 644 |
| Grade | NC3020 (Premium High-Speed Steel CVD) |
| Nose Radius | 1.6 mm (Maximum Strength) |
Core Performance Benefits:
- Aggressive Feeding: The 1.6mm radius allows for much higher feed rates while maintaining structural edge stability.
- Heavy Stock Removal: GR chipbreaker is designed for large depths of cut (ap), effectively breaking chips even in tough, long-chipping steels.
- High Thermal Capacity: The massive carbide volume dissipates heat effectively during long, high-heat continuous cuts on large diameter shafts.
- Wear Resistance: NC3020’s thick Al2O3 layer ensures a long tool life when machining pre-machined or clean steel surfaces at high speeds.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel | 160 - 300 m/min | 0.40 - 0.95 mm/rev | 4.0 - 10.0 mm |
| Alloy Steel (roughing) | 140 - 260 m/min | 0.35 - 0.80 mm/rev | 3.5 - 9.0 mm |
| Cast Steel | 120 - 220 m/min | 0.40 - 0.85 mm/rev | 3.0 - 8.5 mm |
Compatible Tool Holders:
Due to the massive forces of 1906 size inserts, use Heavy-Duty 19-Series holders:
- External Turning: PCLNR/L 3232P19 / PCLNR/L 4040R19
Roughing Guide: NC3020 vs. NC3030
Which toughness level is right for your massive scale job?
First choice for continuous cutting at high speeds. It provides the longest tool life on clean steel parts and maximizes output.
Best for heavy interrupted cuts or forged parts with irregular surfaces. Use this to prevent sudden edge breakage in unstable conditions.
Machinist's Pro Tip: With the 1.6mm radius, don't be afraid to push the feed rate. This insert performs best when the chipbreaker is fully engaged at feeds above 0.4 mm/rev.
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.