Korloy VBMT160404-HMP NC3020 (ANSI VBMT 331-HMP) CVD Carbide Insert for Steel (10pcs)
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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.
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