Korloy VBMT160408-HMP NC3030 (ANSI VBMT 332-HMP) Tough CVD Insert for Interrupted Steel Cuts (10pcs)
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The Original Korloy VBMT160408-HMP NC3030 (ANSI Cross Reference: VBMT 332-HMP) is a high-performance 35° Rhombic Positive Insert engineered for Demanding & Interrupted Steel Cutting. While the NC3020 is designed for continuous speed, the NC3030 Grade is the "tough brother" built to survive impacts, vibration, and unstable setups. Combined with the HMP (Harmony Medium-Positive) chipbreaker and a robust 0.8mm radius, this insert excels in turning carbon and alloy steels under harsh conditions.
Built for the Tough Jobs: If your inserts are chipping due to interrupted cuts (keyways, holes) or rough surface scales, NC3030 is the solution. It prioritizes substrate toughness to prevent catastrophic tool failure where other grades shatter.
Technical Specifications (Metric & ANSI):
| ISO Designation | VBMT 160408-HMP |
| ANSI Designation | VBMT 332-HMP |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.8 mm / (1/32") |
| Grade | NC3030 (Tough CVD Coated) |
| Application | Steel (P25-P40) - Interrupted Cuts |
Core Performance Benefits:
- Maximum Impact Resistance: NC3030 utilizes a specialized substrate that absorbs mechanical shock, making it the top choice for heavy interruptions.
- Thermal Crack Protection: The CVD coating is optimized to resist thermal fatigue, a common issue in wet-dry alternating cutting cycles.
- Stable HMP Chip Control: Effectively breaks chips even in low-rigidity environments, reducing the risk of chip-related tool damage.
- Extended R0.8 Tool Life: The larger radius provides a massive amount of support behind the cutting edge, perfect for scaly forged parts.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (Interrupted) | 120 - 250 m/min | 0.12 - 0.28 mm/rev | 0.5 - 2.5 mm |
| Forged Steel / Crusty Surface | 100 - 200 m/min | 0.15 - 0.30 mm/rev | 0.8 - 3.0 mm |
Universal Holder Compatibility:
- External Shapers: SVJBR 2020K16 / SVJBR 2525M16
- Large Boring Bars: S32T-SVUBC16 / S40U-SVQBC16
NC3020 vs. NC3030: Which one?
Best for Continuous Turning and high speeds. Maximum wear resistance on clean, smooth surfaces.
Best for Heavy Interruption and rough cast/forged surfaces. High impact resistance to prevent breakage.
Pro Advice: If you are unsure about the stability of your setup, start with NC3030. It is much more forgiving than NC3020.
Packaging: 10 pieces per box.
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