Korloy CNMG160608-HM NC3030 Heavy-Duty Steel Roughing Insert (10pcs)
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The Original Korloy CNMG160608-HM NC3030 (ANSI Standard: CNMG 542) is a powerhouse insert engineered for heavy-duty steel machining and roughing. The 1606 thickness (6.35mm) provides maximum structural integrity to withstand massive cutting forces. The HM (Medium Roughing) chipbreaker features a reinforced cutting edge that excels at breaking thick chips and managing heavy depths of cut. Combined with the NC3030 CVD grade, which is optimized for maximum toughness, this insert is the ultimate solution for interrupted cuts and rough surfaces on carbon and alloy steels.
Built for Strength: This is not a standard finishing tool. The CNMG1606 series is designed for large-scale production where reliability in heavy stock removal is the #1 priority.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG160608-HM |
| ANSI Code | CNMG 542 |
| Grade | NC3030 (High-Toughness CVD for Interrupted Cuts) |
| Thickness | 6.35 mm (Heavy Duty) |
Core Performance Benefits:
- Maximum Edge Reliability: NC3030 grade is the toughest in the Korloy steel series, preventing sudden chipping during heavy interruptions.
- Optimized for Stock Removal: HM chipbreaker handles deep passes (ap) while maintaining control over chip flow to protect the workpiece and tool.
- Superior Heat Shield: The thick Al2O3 CVD coating provides an excellent thermal barrier, allowing for extended tool life in high-temperature dry machining.
- Reinforced Geometry: The 0.8mm radius combined with a strong T-land prevents edge fracture during the first pass on rough forged surfaces.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (Roughing) | 120 - 250 m/min | 0.25 - 0.60 mm/rev | 2.0 - 7.0 mm |
| Alloy Steel (Interrupted) | 100 - 200 m/min | 0.20 - 0.50 mm/rev | 2.0 - 6.0 mm |
| Steel Castings | 80 - 180 m/min | 0.25 - 0.55 mm/rev | 1.5 - 6.0 mm |
Compatible Tool Holders:
Due to the 1606 size, ensure you use large-shank D-Type holders for maximum rigidity:
- External Roughing: MCLNR/L 2525M16 /MCLNR/L 3232P16
Steel Grade Choice: NC3030 vs. NC3020
Selecting the right CVD grade for roughing operations:
First choice for heavy interrupted cuts, forged skin, and machining parts with scale. It prioritizes impact resistance over speed.
Best for continuous cutting at higher speeds. Offers better wear resistance but is more likely to chip if hit by sudden interruptions.
Machinist's Pro Tip: When using the HM breaker, if the chips are not breaking properly, increase your feed rate. This geometry is designed to work under pressure; light feeding will lead to bird-nesting.
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.