Korloy VNMG160404-HM NC3020 (ANSI VNMG 331-HM) CVD Double-Sided Insert for Steel (10pcs)
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The Original Korloy VNMG160404-HM NC3020 (ANSI Cross Reference: VNMG 331-HM) is a highly efficient 35° Rhombic Negative Insert designed for General Purpose Steel Turning. Utilizing the dual-sided strength of the VNMG geometry, this insert offers four precision cutting edges for maximum economy. The NC3020 CVD Grade provides a thick alumina layer for superior heat resistance, while the HM (Harmony Medium) chipbreaker ensures excellent chip control across a wide range of feed rates and depths of cut.
High-Speed Stability: The NC3020 grade is optimized for continuous cutting at elevated surface speeds. Its multi-layer CVD coating acts as a robust thermal barrier, preventing plastic deformation of the 35° sharp tip during long profiling cycles.
Technical Specifications (Metric & ANSI):
| ISO Designation | VNMG 160404-HM |
| ANSI Designation | VNMG 331-HM |
| 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) |
| Application | Carbon Steel, Alloy Steel (P15 - P30) |
Core Performance Benefits:
- 4 Cutting Edges: Unlike positive V-inserts (VCMT/VBMT), the negative VNMG geometry allows you to use both sides of the insert, effectively doubling your tool life per insert.
- HM Chipbreaker: Designed with a balanced rake angle to provide a "Harmony" between edge strength and sharpness. Excels at medium depths of cut (1.0mm - 3.0mm).
- TiCN + Al2O3 Coating: This premium CVD combination offers extreme wear resistance and prevents cratering during high-speed production.
- Precise 0.4mm Radius: Ideal for creating fine surface finishes and accessing tight corners in complex profiling applications.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Mild Steel (1018/1045) | 150 - 350 m/min | 0.10 - 0.25 mm/rev | 0.5 - 3.0 mm |
| Alloy Steel (4140/8620) | 120 - 280 m/min | 0.08 - 0.22 mm/rev | 0.5 - 2.5 mm |
Compatible Tool Holders:
- External Turning: MVJNR / MVVNN / DVLNR Series (Size 16)
- Internal Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
Machinist Tip: Maximizing VNMG Utility
The HM chipbreaker is very versatile, but it performs best when the depth of cut is greater than the corner radius (0.4mm). For very light finishing cuts, consider a "VF" (Finishing) chipbreaker.
Negative inserts like VNMG require a rigid setup. Ensure your workpiece and holder are secure to avoid vibration, especially when profiling with the full length of the 35° edge.
Packaging: 10 pieces per box.
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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.