Korloy VNMG160404-HM PC9030 (ANSI VNMG 331-HM) PVD Carbide Insert for Stainless Steel (10pcs)
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The Original Korloy VNMG160404-HM PC9030 (ANSI Cross Reference: VNMG 331-HM) is a high-performance 35° Rhombic Negative Insert specifically engineered for Stainless Steel Turning. Featuring the specialized PC9030 PVD Grade, this insert is designed to combat the unique challenges of work-hardening and built-up edge (BUE) common in austenitic stainless steels (304, 316). With its 4 cutting edges and precise 0.4mm radius, it provides an exceptional combination of economy, surface finish, and edge sharpness.
Superior Adhesion Resistance: Stainless steel is notorious for sticking to the tool edge. The ultra-smooth PVD TiAlN coating on the PC9030 grade minimizes friction, allowing chips to evacuate quickly and preventing the "welding" effect that ruins surface finishes.
Technical Specifications (Metric & ANSI):
| ISO Designation | VNMG 160404-HM |
| ANSI Designation | VNMG 331-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | PC9030 (Premium PVD Coated) |
| Target Materials | Stainless Steel (M), HRSA (S) |
Core Performance Benefits:
- Advanced PVD TiAlN Coating: Offers high oxidation resistance and hardness at elevated temperatures, protecting the sharp cutting edge during long cycles in stainless steel.
- Double-Sided 4-Edge Design: Maximizes cost-efficiency by providing four usable edges per insert, outperforming single-sided positive inserts in high-volume production.
- HM "Harmony" Chipbreaker: Specially tuned for medium-duty cutting, this breaker ensures stable chip control even in "gummy" materials, preventing scratches on the workpiece.
- High-Precision R0.4 Edge: Generates lower radial cutting forces, making it ideal for precision profiling, fine finishes, and machining thin-walled or unstable parts.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic (304/316) | 100 - 180 m/min | 0.08 - 0.20 mm/rev | 0.5 - 2.5 mm |
| Martensitic (420/440C) | 110 - 200 m/min | 0.08 - 0.18 mm/rev | 0.5 - 2.5 mm |
Compatible Tooling:
- External Profile Tooling: MVJNR / MVVNN / DVLNR Series (Size 16)
- Internal Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
Pro Tip: Precision Stainless Profiling
When profiling stainless with an R0.4 tip, use a feed rate at least 25% higher than the honing/radius of the edge to "bite" into the material. This helps prevent work-hardening and chatter.
Always use high-pressure, flood coolant when machining stainless steel with PC9030. This ensures the chips are cooled instantly, preventing them from fusing to the HM chipbreaker.
Packaging: 10 pieces per box.
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Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.