Korloy VBMT160408-HMP NC3120 (ANSI VBMT 332-HMP) Upgraded CVD Steel Turning Insert (10pcs)
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The Original Korloy VBMT160408-HMP NC3120 (ANSI Cross Reference: VBMT 332-HMP) is a high-performance 35° Rhombic Positive Insert engineered for Optimized Steel Machining. Featuring the latest NC3120 Grade, it offers a significant upgrade over the classic NC3020 by improving coating adhesion and substrate toughness. The robust 0.8mm (1/32") radius allows for higher feed rates and increased productivity in semi-finishing and medium cutting of carbon and alloy steels.
The Performance Edge: The NC3120 series provides a wider "sweet spot" for machining. It maintains high wear resistance during continuous cuts while offering the toughness needed to handle slight interruptions and varying surface conditions without chipping.
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 | NC3120 (New Era CVD) |
| Workpiece Material | Steel (P15 - P35) |
Core Performance Benefits:
- Advanced CVD Nanotechnology: NC3120’s refined multi-layer coating provides superior thermal protection and prevents crater wear during high-speed operation.
- Stronger R0.8 Edge: The 0.8mm radius offers much better resistance to mechanical shock and heat concentration than the 0.4mm version, enabling more aggressive cutting.
- HMP Harmony Chipbreaker: Excellent chip breaking across a wide range of feed rates, specifically designed to reduce radial cutting forces and prevent vibration.
- Predictable Tool Life: The upgraded substrate and coating combination ensures consistent performance, part after part.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045/S45C) | 160 - 350 m/min | 0.12 - 0.28 mm/rev | 0.5 - 3.5 mm |
| Alloy Steel (4140/SCM440) | 140 - 280 m/min | 0.10 - 0.25 mm/rev | 0.5 - 2.5 mm |
Tool Holder Compatibility:
Precision-matched for VBMT 1604 tool holders:
- External Shapers: SVJBR 2525M16 / SVVBN 2020K16
- Internal Boring Bars: S32T-SVUBR16 / S40U-SVQBR16
Machinist Tip: Efficiency & Surface Finish
Why choosing the R0.8 (VBMT 332) pays off:
With the R0.8 radius and NC3120 grade, you can often push feed rates significantly higher than with an R0.4, directly cutting down your machining time per part while maintaining a robust edge.
The larger radius creates a better "wiper effect" at higher feed rates compared to an R0.4. If you need a clean finish but don't want to crawl at low feed speeds, the 160408 is your best candidate.
Packaging: 10 pieces per box.
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