Korloy CNMG160608-HM NC3020 Steel Medium Roughing Insert (10pcs)
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The Original Korloy CNMG160608-HM NC3020 (ANSI Standard: CNMG 542) is a high-performance carbide insert designed for medium-to-heavy roughing of steel. With a thickness of 6.35mm, the 1606 series provides the extra structural strength required for large stock removal on medium and large CNC lathes. The HM chipbreaker is engineered with a stable cutting edge that provides excellent chip control at higher feed rates, while the NC3020 CVD coating ensures superior wear resistance during high-speed continuous cutting operations.
High-Speed Roughing: Unlike the 3030 grade which prioritizes toughness, the NC3020 grade allows for significantly higher cutting speeds (Vc), making it the ideal choice for maximizing productivity in stable steel turning.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG160608-HM |
| ANSI Code | CNMG 542 |
| Grade | NC3020 (Universal High-Speed Steel Grade) |
| Chipbreaker | HM (Medium Roughing) |
Core Performance Benefits:
- Excellent Wear Resistance: Advanced CVD coating technology provides a thick alumina layer for high thermal protection at high speeds.
- Enhanced Edge Stability: The HM geometry is reinforced to handle the high radial forces common in large-diameter steel turning.
- Superior Productivity: Optimized for high-speed continuous machining, reducing cycle times for carbon and alloy steels.
- Reliable Chip Breaking: The HM groove design prevents long, dangerous stringy chips even at substantial depths of cut.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (AISI 1045) | 160 - 320 m/min | 0.25 - 0.55 mm/rev | 2.0 - 6.0 mm |
| Alloy Steel (AISI 4140) | 140 - 280 m/min | 0.20 - 0.50 mm/rev | 1.5 - 5.0 mm |
| Mild Steel (A36) | 180 - 350 m/min | 0.25 - 0.60 mm/rev | 2.0 - 6.5 mm |
Compatible Tool Holders:
For heavy-duty applications, we recommend Double-Clamping (D-Type) holders for maximum insert security:
- External Roughing: MCLNR2525M16 / MCLNR3232P16
Steel Grade Choice: NC3020 vs. NC3030
How to choose the right CVD grade for your CNMG 542 inserts:
Best for stable, continuous cutting at high speeds. It offers longer tool life on clean, pre-machined surfaces.
Best for heavy interrupted cuts or parts with forged skin/scale. It sacrifice speed for extreme edge security.
Machinist's Pro Tip: If you are machining a large shaft with no interruptions, NC3020 will allow you to run up to 25% faster than NC3030, significantly cutting down production time.
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.