Korloy VBMT110304-HMP NC3020 (ANSI VBMT 221-HMP) CVD Carbide Insert for Steel (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy VBMT110304-HMP NC3020 (ANSI Cross Reference: VBMT 221-HMP) is a high-performance 35° Rhombic Positive Insert specifically optimized for Medium-Finishing of Steel. Featuring the innovative HMP (Harmony Medium-Positive) chipbreaker, it offers superior chip control and reduced cutting forces. The NC3020 CVD Coated Grade provides an ideal balance of wear resistance and toughness, making it the industry standard for stable production in carbon and alloy steels.
Superior Chip Control: The HMP chipbreaker is designed with a specialized 3D geometry that ensures stable chip evacuation even at varying depths of cut, preventing the "bird-nesting" common in ductile steel machining.
Technical Specifications:
| 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 | NC3020 (CVD Coated) |
| Primary Material | Steel (P10-P30) |
Core Performance Benefits:
- Optimized CVD Coating: The Al2O3 coating layer provides excellent heat shield and oxidation resistance for high-speed operation.
- HMP Chipbreaker: Lower cutting resistance allows for higher feeds without compromising tool life or surface finish.
- Versatile Application: Suitable for both continuous and light interrupted cutting in a wide variety of steel types.
- Visible Wear: The gold-colored TiN top layer makes it easy to identify edge wear, preventing premature tool changes.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel / Alloy Steel | 150 - 300 m/min | 0.03 - 0.20 mm/rev | 0.15 - 2.70 mm |
| Mild Steel (A36 / 1018) | 180 - 350 m/min | 0.05 - 0.18 mm/rev | 0.20 - 2.00 mm |
Compatible Tooling Systems:
Fits all standard 35° rhombic positive tool holders (5° relief), including:
- External Turning: SVJBR / SVVBN / SVHBR Series
- Internal Boring: S-SVUBC / S-SVQBC Boring Bars
Machinist Tip: The "Steel Universal" Setup
Why NC3020 is your best daily driver:
When machining forged steel with hard outer "skin," the NC3020 substrate prevents chipping at the depth-of-cut line, while the HMP breaker manages the transition to the softer interior material perfectly.
The 0.4mm (1/64") radius is the sweet spot for achieving tight tolerances and Ra finishes below 1.6µm. For even better finishes in high-speed applications, ensure your feed rate is around 0.1mm/rev.
Packaging: 10 pieces per box.
VBMT 221-HMP Korloy NC3020, VBMT110304 for steel, HMP chipbreaker medium turning, Korloy NC3020 cutting speed, VBMT inserts for SVJBR holder, CVD coated carbide inserts for alloy 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.