Korloy VNMG160404-HS PC9030 (ANSI VNMG 331-HS) Precision Finishing PVD Insert for Stainless Steel (10pcs)
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The Original Korloy VNMG160404-HS PC9030 (ANSI Cross Reference: VNMG 331-HS) is a high-precision 35° Rhombic Negative Insert specifically engineered for the Finishing and Semi-Finishing of Stainless Steel. The HS Chipbreaker is designed with an exceptionally sharp edge to "slice" through gummy materials, effectively preventing the work-hardening common in austenitic stainless steels. Coupled with the PC9030 PVD Grade, this insert provides a smooth, reliable cut with a superior surface finish.
Anti-Stick Performance: Stainless steel finishing requires low friction. The PC9030's ultra-smooth PVD coating prevents material from welding to the cutting edge, ensuring dimensional accuracy and a high-gloss reflective finish on your workpiece.
Technical Specifications (Metric & ANSI):
| ISO Designation | VNMG 160404-HS |
| ANSI Designation | VNMG 331-HS |
| 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 (Advanced PVD TiAlN) |
| Primary Materials | Stainless Steel (M), HRSA (S), Titanium |
Core Performance Benefits:
- Ultra-Sharp HS Geometry: Features a high rake angle that minimizes cutting resistance, making it perfect for thin-walled parts and precision profiles.
- PVD PC9030 Reliability: The specialized TiAlN coating excels in high-heat environments, protecting the cutting edge from the abrasive nature of stainless steel.
- Superior Chip Control: Designed to break chips efficiently at very low depths of cut (as low as 0.15mm), preventing chip nesting and surface scratching.
- 4 Cutting Edges: The negative VNMG design provides double the cutting edges of a standard finishing V-insert, offering superior ROI.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| 304 / 316 Stainless | 110 - 200 m/min | 0.05 - 0.18 mm/rev | 0.15 - 1.5 mm |
| Titanium Alloys | 40 - 80 m/min | 0.05 - 0.15 mm/rev | 0.10 - 1.0 mm |
Compatible Tooling:
- External Turning: MVJNR / MVVNN / DVLNR Series (Size 16)
- Internal Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
Machinist Tip: The "Finishing Touch"
When finishing stainless steel, your depth of cut (ap) should be equal to or greater than the corner radius (0.4mm) whenever possible to prevent the tool from rubbing and work-hardening the surface.
Use high-concentration coolant or oil to keep the cutting zone stable. The sharp HS edge thrives when it can slice through a lubricated surface at a consistent speed.
Packaging: 10 pieces per box.
VNMG 331-HS Korloy PC9030, stainless steel finishing insert R0.4, Korloy HS chipbreaker specs, best insert for 316 stainless profiling, PVD coated finishing inserts, precision turning 304 stainless
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.