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.