Korloy VNMG160404-HM NC3030 (ANSI VNMG 331-HM) Tough CVD Insert for Interrupted Steel Cutting (10pcs)
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The Original Korloy VNMG160404-HM NC3030 (ANSI Cross Reference: VNMG 331-HM) is a high-toughness 35° Rhombic Negative Insert engineered for Demanding Steel Machining. While other inserts chip under mechanical shock, the NC3030 Grade features a specialized substrate that absorbs impact, making it ideal for interrupted cuts, forged surfaces, and less-than-rigid setups. With 4 usable cutting edges, it delivers maximum economy without compromising reliability.
Toughness First: If your machining involves cross-holes, keyways, or raw forging skins, NC3030 is your insurance policy against sudden tool failure. It maintains edge integrity where NC3020 might struggle with micro-chipping.
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 | NC3030 (Maximum Impact Resistance CVD) |
| Primary Material | Steel (P25 - P40) - Heavily Interrupted |
Core Performance Benefits:
- 4 Cutting Edges: Double-sided negative design provides 4 precise edges, significantly lowering your cost-per-part compared to positive inserts.
- Impact-Absorbing Carbide: The NC3030 substrate is optimized for toughness, preventing crack propagation during the hammering effect of interrupted turning.
- HM "Harmony Medium" Breaker: Provides stable chip control across a wide range of medium-duty operations, even when cutting parameters vary.
- Advanced CVD Coating: A specialized TiCN+Al2O3 layer ensures thermal stability while protecting the tough substrate from abrasive wear.
Recommended Cutting Parameters:
| Workpiece Condition | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Interrupted Steel Cut | 120 - 240 m/min | 0.08 - 0.22 mm/rev | 0.5 - 2.5 mm |
| Forged / Scaly Surfaces | 100 - 200 m/min | 0.10 - 0.25 mm/rev | 0.5 - 3.0 mm |
Compatible Tool Holders:
- External Profile Tooling: MVJNR / MVVNN / DVLNR Series (Size 16)
- Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
NC3020 vs. NC3030
Best for continuous turning at high speeds. Maximum wear resistance on clean material.
Best for heavy interruptions and old machines. Prioritizes edge safety over pure speed.
Packaging: 10 pieces per box.
VNMG 331-HM Korloy NC3020 vs NC3030, VNMG160404 for interrupted cuts, best insert for scale steel turning, Korloy NC3030 cutting data, double sided profiling inserts 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.