Korloy VNMG160412-HM NC3020 (ANSI VNMG 333-HM) Heavy-Duty Double-Sided Steel Turning Insert (10pcs)
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The Original Korloy VNMG160412-HM NC3020 (ANSI Cross Reference: VNMG 333-HM) is a high-strength 35° Rhombic Negative Insert built for Heavy-Duty Steel Machining. With a reinforced 1.2mm (3/64") Corner Radius, this insert is the most robust option in the VNMG 1604 range, specifically designed to handle large depths of cut and high feed rates. The NC3020 CVD Grade provides excellent thermal protection, while the HM (Harmony Medium) chipbreaker manages heavy chip loads with ease.
Maximum Edge Toughness: When R0.4 or R0.8 inserts fail due to edge chipping or thermal cracking, the R1.2 (VNMG 333) steps in. The larger radius provides maximum carbide volume at the point of engagement, making it ideal for roughing forged surfaces or interrupted cuts.
Technical Specifications (Metric & ANSI):
| ISO Designation | VNMG 160412-HM |
| ANSI Designation | VNMG 333-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 1.2 mm / (3/64") |
| Grade | NC3020 (Premium CVD Coated) |
| Primary Application | Heavy Roughing of Steel (P15-P35) |
Core Performance Benefits:
- Enhanced Edge Security: The large 1.2mm radius effectively distributes cutting pressure, significantly reducing the risk of sudden tip fracture during heavy-duty profiling.
- NC3020 CVD Reliability: Features a high-performance TiCN+Al2O3 coating that excels in high-speed continuous turning by resisting crater wear.
- Productive HM Chipbreaker: Optimized to break thicker chips produced at high feed rates, ensuring safe and efficient material removal.
- 4 Cutting Edges: Double-sided negative geometry delivers four usable edges, providing excellent return on investment compared to positive inserts.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Forged / Carbon Steel | 140 - 320 m/min | 0.15 - 0.40 mm/rev | 1.0 - 4.5 mm |
| Alloy Steel | 120 - 250 m/min | 0.12 - 0.35 mm/rev | 1.0 - 3.5 mm |
Compatible Tooling:
- External Holders: MVJNR / MVVNN / DVLNR 1604 Series
- Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
Pro Tip: When to use R1.2?
Use the VNMG 333 when your goal is maximum metal removal rate (MRR). The larger radius allows for aggressive feeds that would destroy an R0.4 insert.
Because a 1.2mm radius generates higher radial forces, ensure your machine and tool holder are high-rigidity. Not recommended for small diameter boring bars or thin-walled parts.
Packaging: 10 pieces per box.
VNMG 333-HM Korloy NC3020, VNMG160412 heavy steel turning, R1.2 profiling inserts, Korloy NC3020 interrupted cut, large radius 35 degree inserts, VNMG 160412 for alloy steel
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.