Korloy CNMG190616-GR NC3020 Heavy Roughing Steel Insert, R1.6 (10pcs)
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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.