Korloy VBMT160408-HMP NC3020 (ANSI VBMT 332-HMP) CVD Carbide Insert for Steel (10pcs)
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The Original Korloy VBMT160408-HMP NC3020 (ANSI Cross Reference: VBMT 332-HMP) is a high-rigidity 35° Rhombic Positive Insert built for Medium Cutting of Steel. With a thicker 1604 substrate and a reinforced 0.8mm (1/32") Corner Radius, this insert handles higher material removal rates while maintaining exceptional edge integrity. The NC3020 CVD Coating ensures the tool withstands the high temperatures of continuous production in carbon and alloy steels.
Reinforced Performance: The R0.8 corner radius makes this version significantly tougher than the R0.4, allowing for increased feed rates (up to 0.25 mm/rev) and deeper cuts without sacrificing tool life.
Technical Specifications (ISO & 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 | NC3020 (CVD Al2O3+TiCN) |
| Application | Steel (P10-P30) |
Core Performance Benefits:
- High-Stability Grade (NC3020): Features a premium Al2O3 layer that provides a thermal barrier, protecting the substrate from plastic deformation during high-speed machining.
- Optimized HMP Chipbreaker: Designed for "Harmony Medium-Positive" performance, controlling chips effectively across a broad range of depths and feed rates.
- Superior Toughness: The 0.8mm radius provides a stronger cutting edge, making it ideal for forged surfaces or materials with minor surface interruptions.
- Wide Compatibility: Perfectly fits SVJBR tool holders for external profiling and internal boring operations.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel | 180 - 400 m/min | 0.15 - 0.25 mm/rev | 0.7 - 2.0 mm |
| Alloy Steel (4140/8620) | 150 - 300 m/min | 0.12 - 0.22 mm/rev | 0.5 - 1.8 mm |
Tool Holder Compatibility:
- External Profile: SVJBR 2525M16 / SVVBN 2020K16
- Internal Boring: S32T-SVUBC16 / S40U-SVQBC16
Machinist Tip: Maximizing R0.8 Performance
When to switch from R0.4 to R0.8:
If your setup allows for higher feeds, the VBMT 332 (R0.8) can typically run at feeds 20-30% higher than the VBMT 331 (R0.4) while maintaining similar tool life, drastically reducing your cycle times.
For materials with hard spots or rough-turned surfaces, the larger radius of the 160408 helps distribute cutting pressure over a wider area, preventing the localized heat buildup that causes notch wear.
Packaging: 10 pieces per box.
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