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.
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