Korloy VNMG160404-HS NC3020 (ANSI VNMG 331-HS) Finishing CVD Carbide Insert for Steel (10pcs)
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The Original Korloy VNMG160404-HS NC3020 (ANSI Cross Reference: VNMG 331-HS) is a high-precision 35° Rhombic Negative Insert engineered for Finishing and Semi-Finishing of Steel. Designed for applications where surface quality is paramount, the HS Chipbreaker features a sharp cutting edge that reduces cutting forces and prevents vibration. Combined with the thermal stability of the NC3020 CVD Grade, this insert excels in high-speed, continuous profiling operations on carbon and alloy steels.
Superior Surface Finish: The HS geometry is specifically optimized for small depths of cut and low feed rates. Its sharp rake angle "slices" through the material rather than pushing it, significantly reducing heat buildup and workpiece deflection in delicate parts.
Technical Specifications (Metric & ANSI):
| ISO Designation | VNMG 160404-HS |
| ANSI Designation | VNMG 331-HS |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | NC3020 (Premium CVD Coated) |
| Primary Materials | Carbon Steel, Alloy Steel (P15 - P25) |
Core Performance Benefits:
- High-Precision HS Breaker: Specifically designed for light cuts, ensuring chips are curled and broken even at shallow depths of cut (0.2mm - 1.5mm).
- 4 Cutting Edges: Double-sided negative design offers four usable edges, providing much better cost-efficiency than single-sided positive inserts (VCMT).
- NC3020 CVD Reliability: The multi-layer TiCN + Al2O3 coating offers excellent wear resistance and thermal protection during long continuous cuts.
- Low Cutting Force: The sharp edge profile minimizes radial force, making it ideal for high-precision machining and thin-shaft turning where chatter is a concern.
Recommended Cutting Parameters:
| Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1018/1045) | 180 - 400 m/min | 0.05 - 0.20 mm/rev | 0.2 - 2.0 mm |
| Alloy Steel (4140) | 150 - 320 m/min | 0.05 - 0.18 mm/rev | 0.2 - 1.5 mm |
Compatible Tool Holders:
- External Turning: MVJNR / MVVNN / DVLNR Series (Size 16)
- Internal Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
Machinist Tip: Achieving the Perfect RA
For the best surface finish with a 0.4mm radius, aim for a feed rate of 0.08 - 0.12 mm/rev. Exceeding 0.15 mm/rev may increase the scallop height and affect the finish quality.
Because VNMG is a negative insert, it requires a rigid setup. When using the HS breaker for finishing, ensure the overhang is as short as possible to take full advantage of the sharp edge.
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.