Korloy CNMG160612-GR NC3020 Heavy Roughing Steel Turning Insert (10pcs)
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The Original Korloy CNMG160612-GR NC3020 (ANSI Standard: CNMG 543) is a heavy-duty powerhouse engineered for maximum stock removal in steel turning. The "1606" designation indicates a massive 6.35mm thickness, providing the rigidity needed to handle immense cutting pressure. The GR (Heavy Roughing) chipbreaker is designed with a reinforced T-land and a wide chip groove to facilitate large depths of cut and high feed rates. Paired with the NC3020 CVD coating, this insert excels in high-speed continuous roughing of carbon and alloy steels.
High-Feed Efficiency: With a 1.2mm (3/64") nose radius, the CNMG 543-GR is capable of aggressive feeding, significantly reducing cycle times on large workpieces while maintaining excellent tool edge security.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG160612-GR |
| ANSI Code | CNMG 543 |
| Grade | NC3020 (CVD Coating - High Speed Wear Resistance) |
| Nose Radius | 1.2 mm (Heavy Strength) |
Core Performance Benefits:
- Maximum Edge Toughness: The 1.2mm radius distributes cutting forces over a larger area, preventing localized heat build-up and chipping.
- Optimized for Heavy Stock Removal: GR geometry allows for aggressive depths of cut (ap) up to 8.0mm in stable conditions.
- High-Speed Stability: NC3020 CVD coating features a thick Al2O3 layer for superior heat protection during prolonged high-speed roughing.
- Superior Rigidity: The extra-thick 6.35mm insert body absorbs vibrations, ensuring stable performance on large shafts and forged parts.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (Medium Hardness) | 150 - 300 m/min | 0.30 - 0.75 mm/rev | 3.0 - 8.0 mm |
| Alloy Steel (Continuous Cut) | 130 - 260 m/min | 0.25 - 0.60 mm/rev | 2.5 - 7.0 mm |
| Soft / Mild Steel | 180 - 350 m/min | 0.35 - 0.80 mm/rev | 3.0 - 8.0 mm |
Compatible Tool Holders:
For heavy roughing, we recommend using large-shank Double-Clamping (D-Type) holders to prevent insert movement:
- External Roughing: MCLNR2525M16 / MCLNR3232P16
Roughing Tip: GR vs. HM Chipbreaker
Which geometry should you choose for heavy steel turning?
Built for extreme feeding and large depth of cut. The cutting edge is highly reinforced to prevent breakage under extreme loads.
Best for general-purpose roughing. Offers a sharper cutting action than GR, making it suitable for lower horsepower machines.
Machinist's Insight: When using the 1.2mm radius GR geometry, ensure your machine has sufficient torque. This insert is designed to "plow" through material; running it at too low of a feed rate can cause vibration and poor chip breaking.
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.