Korloy VCMT160404-HMP NC3020 (ANSI VCMT 331-HMP) CVD Carbide Insert for Steel (10pcs)
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The Original Korloy VCMT160404-HMP NC3020 (ANSI Cross Reference: VCMT 331-HMP) is a high-rigidity 35° Rhombic Positive Insert engineered for Precision Steel Machining. Designed for stability in profiling and semi-finishing, the 1604 series (4.76mm thickness) minimizes vibration during long-reach operations. The NC3020 CVD Coating ensures the tool maintains a sharp, wear-resistant edge during high-speed production of carbon and alloy steels.
Rigid Profiling Specialist: The VCMT 1604 series provides the critical mass and thickness needed to prevent plastic deformation, making it superior to thinner inserts for high-precision contouring on steel workpieces.
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 | NC3020 (CVD Coated) |
| Application | Steel (P10 - P30) |
Core Performance Benefits:
- Optimized CVD Coating (NC3020): Features a multi-layered TiCN+Al2O3 structure for excellent heat resistance and long tool life in dry or wet cutting conditions.
- HMP Chipbreaker: Specifically designed for "Harmony Medium-Positive" performance, controlling chips effectively at feed rates common in semi-finishing.
- Superior Stability: The 4.76mm thickness allows for higher clamping force and reduces chatter during internal boring operations.
- Enhanced Precision: The V-bottom geometry ensures accurate indexing and repeatability, which is critical for maintaining tight tolerances.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel / Alloy Steel | 150 - 350 m/min | 0.08 - 0.22 mm/rev | 0.5 - 2.5 mm |
| Pre-hardened Steel | 100 - 220 m/min | 0.06 - 0.18 mm/rev | 0.3 - 1.5 mm |
Compatible Tooling Systems:
Commonly used in 7° relief angle tool holders, including:
- External Turning: SVJCR / SVVCN / SVHCR Series (Ensure holder is for 16-size)
- Internal Boring Bars: S32T-SVUCR16 / S40U-SVQCR16
Machinist Tip: VCMT vs. VBMT
Understanding the subtle difference:
VCMT inserts (like this 160404) are often used in tool holders that require a slightly different seating and clamping style than VBMT. They are highly favored for internal boring operations where chip evacuation and clearance are tighter.
With the 0.4mm (R0.4) radius, you get a much finer finish. To avoid work-hardening, ensure your feed is at least 0.1mm/rev to stay engaged with the material.
Packaging: 10 pieces per box.
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