Korloy VCMT160404-HMP NC3030 (ANSI VCMT 331-HMP) Tough CVD Insert for Interrupted Steel Cutting (10pcs)
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The Original Korloy VCMT160404-HMP NC3030 (ANSI Cross Reference: VCMT 331-HMP) is a high-toughness 35° Rhombic Positive Insert engineered for Demanding Steel Turning. While other inserts chip under pressure, the NC3030 Grade is built to withstand mechanical shocks, interrupted cuts, and unstable setups. Combined with the HMP (Harmony Medium-Positive) chipbreaker and a precise 0.4mm radius, it is the premier choice for internal and external profiling of steels with rough surfaces or cross-holes.
Maximum Edge Security: If you are experiencing sudden insert breakage during internal boring or while profiling shafts with keyways, the NC3030 grade provides the extra insurance needed to complete the part without tool failure.
Technical Specifications (Metric & ANSI):
| ISO Designation | VCMT 160404-HMP |
| ANSI Designation | VCMT 331-HMP |
| 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 Toughness CVD) |
| Application | Steel (P25 - P40) - Interrupted Cuts |
Core Performance Benefits:
- Impact-Absorbing Substrate: NC3030 uses a specialized carbide matrix that prevents cracks from propagating, making it ideal for the most difficult interrupted cuts.
- Refined CVD Coating: Provides excellent thermal protection while maintaining a smooth surface to reduce friction and cutting forces.
- Precise Profiling: The 35° geometry combined with a 0.4mm radius allows for intricate contouring and sharp corners, even in tough materials.
- HMP Chipbreaker Stability: Optimized to maintain consistent chip control even when cutting conditions are less than ideal.
Recommended Cutting Parameters:
| Workpiece Condition | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Heavy Interrupted Cut | 100 - 220 m/min | 0.08 - 0.20 mm/rev | 0.5 - 2.0 mm |
| Rough Surface / Forging | 80 - 180 m/min | 0.10 - 0.22 mm/rev | 0.5 - 2.5 mm |
Compatible Tooling Systems:
- External Profiling: SVJCR 2020K16 / SVJCR 2525M16
- Internal Boring Bars: S32T-SVUCR16 / S40U-SVQCR16
NC3020 vs. NC3030: The Choice
Choose for continuous turning on clean bar stock. Prioritizes wear resistance and high surface speeds.
Choose for interrupted cuts or unstable parts. Prioritizes toughness to prevent catastrophic tool failure.
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.