Korloy VBMT160404-HMP NC3020 (ANSI VBMT 331-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 VBMT160404-HMP NC3020 (ANSI Cross Reference: VBMT 331-HMP) is a robust 35° Rhombic Positive Insert engineered for Medium-Finishing of Steel. The 1604 size features a reinforced 4.76mm thickness, providing the rigidity needed for deeper cuts and longer tool overhangs. The HMP (Harmony Medium-Positive) chipbreaker offers a wide application range, ensuring stable chip evacuation and a superior surface finish in carbon and alloy steels.
Maximum Stability: The increased mass of the 1604 substrate makes this insert highly resistant to plastic deformation and vibration. It is the preferred choice for larger workpieces where maintaining dimensional accuracy is critical.
Technical Specifications (Metric & ANSI):
| ISO Designation | VBMT 160404-HMP |
| ANSI Designation | VBMT 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 | NC3020 (CVD Coated) |
| Primary Material | Steel (P10-P30) |
Core Performance Benefits:
- Advanced CVD NC3020 Grade: Utilizes a multi-layer coating (TiCN+Al2O3+TiN) for exceptional heat resistance and flank wear protection during high-speed turning.
- HMP Chipbreaker Versatility: Designed with a 3D geometry that manages chips effectively from fine finishing to medium roughing, reducing machine downtime.
- Enhanced Edge Toughness: The combination of a strong substrate and optimized coating prevents micro-chipping even in light interrupted cuts.
- Superior Surface Finish: The sharp yet reinforced cutting edge delivers high-quality Ra values on various steel alloys.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon/Alloy Steel | 150 - 350 m/min | 0.07 - 0.20 mm/rev | 0.5 - 1.5 mm |
| Soft/Mild Steel | 200 - 400 m/min | 0.08 - 0.25 mm/rev | 0.5 - 2.0 mm |
Compatible Tool Holders (5° Relief Angle):
- External Profile Tooling: SVJBR 2020K16 / SVJBR 2525M16
- Internal Boring Bars: S32T-SVUBC16 / S40U-SVQBC16
Machinist Tip: Optimization Guide
How to get the most from your VBMT 331-HMP:
If you experience chatter when using a long boring bar, take advantage of the 1604's thicker base. Ensure your tool setup is as rigid as possible, and maintain a feed rate above 0.1mm/rev to load the tool properly.
The 0.4mm (1/64") radius is ideal for finishing operations and small fillets. It generates lower radial cutting forces than an R0.8, which is essential for machining thin-walled components or slender shafts.
Packaging: 10 pieces per box.
VBMT 331-HMP Korloy NC3020, VBMT160404 for steel machining, NC3020 CVD grade properties, HMP chipbreaker medium turning, Korloy turning inserts for SVJBR holder
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.