Korloy VNMG160408-HM PC9030 (ANSI VNMG 332-HM) PVD Carbide Insert for Stainless Steel (10pcs)
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The Original Korloy VNMG160408-HM PC9030 (ANSI Cross Reference: VNMG 332-HM) is a heavy-duty 35° Rhombic Negative Insert designed for High-Efficiency Stainless Steel Machining. Featuring a robust 0.8mm (1/32") Corner Radius and the specialized PC9030 PVD Grade, this insert excels where high cutting forces and heat are present. With 4 usable cutting edges, it provides maximum cost-efficiency for semi-finishing and medium-duty turning of 300 and 400 series stainless steels.
Built for Toughness: The R0.8 edge is significantly stronger than the R0.4 version, allowing it to withstand the mechanical shock of interrupted cuts and the thermal stress of deep profiling in gummy materials like 304 and 316 stainless steel.
Technical Specifications (Metric & ANSI):
| ISO Designation | VNMG 160408-HM |
| ANSI Designation | VNMG 332-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.8 mm / (1/32") |
| Grade | PC9030 (Premium PVD TiAlN) |
| Application | Stainless Steel (M), Exotic Alloys (S) |
Core Performance Benefits:
- Advanced PVD TiAlN Coating: Specifically developed for stainless steel to provide extreme oxidation resistance and prevent Built-Up Edge (BUE).
- 4 Precision Cutting Edges: The negative geometry allows for double-sided use, effectively halving the tool cost per edge compared to positive V-inserts.
- Enhanced Edge Security: The R0.8 radius handles higher chip loads and provides better heat dissipation than smaller radii, extending tool life in tough materials.
- HM "Harmony" Chipbreaker: Optimizes chip curl and evacuation in ductile materials, reducing the risk of chip-nesting and surface scratching.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic (304/316) | 80 - 160 m/min | 0.12 - 0.28 mm/rev | 0.8 - 3.5 mm |
| Duplex Stainless | 50 - 100 m/min | 0.10 - 0.22 mm/rev | 0.5 - 2.5 mm |
Compatible Tooling:
- External Profile Tool Holders: MVJNR / MVVNN / DVLNR Series (Size 16)
- Internal Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
Machinist Tip: Scaling Up Stainless Productivity
Stainless steel hardens as it is cut. The R0.8 radius allows you to use a higher feed rate to "get under" the work-hardened layer created by the previous pass, significantly extending tool life.
The R0.8 generates more radial force than the R0.4. Ensure your boring bar or tool post is secure to avoid chatter, especially when machining tough austenitic alloys.
Packaging: 10 pieces per box.
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