Korloy VBMT110304-HMP NC3120 (ANSI VBMT 221-HMP) New Generation CVD Steel Insert (10pcs)
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The Original Korloy VBMT110304-HMP NC3120 (ANSI Cross Reference: VBMT 221-HMP) represents the next generation of 35° Rhombic Positive Inserts for Steel Machining. Building on the success of the NC3020, the NC3120 Grade features enhanced coating adhesion and improved substrate toughness. Coupled with the HMP (Harmony Medium-Positive) chipbreaker, it provides a stable, high-performance solution for semi-finishing carbon steels, alloy steels, and tool steels.
The Next Generation Standard: NC3120 is designed to be more versatile than its predecessor. It offers increased resistance to "chipping" in light interrupted cuts while maintaining the high wear resistance needed for high-speed continuous turning.
Technical Specifications (Metric & ANSI):
| ISO Designation | VBMT 110304-HMP |
| ANSI Designation | VBMT 221-HMP |
| Inscribed Circle (IC) | 6.35 mm / (1/4") |
| Thickness (S) | 3.18 mm / (1/8") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | NC3120 (New Generation CVD) |
| Primary Application | Steel (P15 - P35) |
Core Performance Benefits:
- Upgraded CVD Coating Technology: Improved layer structure provides better heat insulation and prevents coating delamination, even under high-load conditions.
- Enhanced Stability: NC3120 bridge the gap between NC3020 and NC3030, offering great wear resistance with significantly better toughness.
- Excellent Chip Control: The HMP geometry creates small, manageable chips across a wide range of feed rates, protecting the workpiece surface.
- Universal Compatibility: Fits all standard SVJBR and SVUBC tool holders.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045) | 160 - 320 m/min | 0.05 - 0.22 mm/rev | 0.2 - 2.5 mm |
| Alloy Steel (4140) | 140 - 280 m/min | 0.05 - 0.18 mm/rev | 0.2 - 2.0 mm |
Why Upgrade to NC3120?
Machinist's perspective on the new Korloy standard:
NC3120 is designed to reduce the need for multiple grades. It's tough enough for light interruptions but hard enough for high SFM finishing. If you want one "standard" steel insert in your drawer, this is it.
The new CVD layer provides superior thermal protection. This is critical for VBMT inserts as their small 35° geometry tends to concentrate heat more than CCGT or CNMG inserts.
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.