SUMITOMO WNMG080408N-SU AC6040M Turning Insert (WNMG 432-SU) for Stainless Steel
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SUMITOMO WNMG080408N-SU AC6040M (WNMG 432-SU) Carbide Turning Insert
1. Product Overview
Looking for the absolute best CNC turning insert to eliminate notch wear and birds-nesting when machining challenging stainless steels?
The SUMITOMO WNMG080408N-SU AC6040M (internationally designated as WNMG 432-SU) is engineered specifically to master hard-to-cut materials. Utilizing Sumitomo’s proprietary AC6040M multi-layered PVD coating technology, this insert features a high-density AlTiCrN layer stacked on an ultra-tough carbide substrate. The specialized SU chipbreaker geometry provides superb chip control during medium-duty turning, effectively lowering cutting forces and preventing built-up edge (BUE) on austenitic, martensitic, and duplex stainless steel alloys.
2. Product Key Features
- Absorbi Shield Coating Tech: Advanced multi-layer PVD structure delivers up to 200% greater fracture resistance compared to conventional coatings under structural impact.
- Optimized SU Chipbreaker Geometry: Specifically engineered rake angle allows fluid chip evacuation during variable depths of cut, reducing machine downtime.
- Double-Sided Trigon Efficiency: Features 6 highly economical, robust cutting edges with 80-degree corner angles for strong structural cross-sections.
- Premium Surface Finish Capability: High-precision micro-honed cutting edge prevents micro-chipping, ensuring reliable Ra surface finish consistency.
3. Technical Specifications & Dimension Matrix
| Standard Typology | Model/Grade Designation | Measurement Basis |
|---|---|---|
| ISO Designation | WNMG080408N-SU | Metric Standard (mm) |
| ANSI Designation | WNMG 432-SU | Imperial Standard (Inch) |
🔍 ISO Standard Code Breakdown: WNMG080408N-SU
Trigon Shape (80°)
0° Relief Angle
M-Class Tolerance
Top Chipbreaker pin
Edge Length (8.7mm)
Thickness (4.76mm)
Nose Radius (0.8mm)
Medium Turning Slot
📊 Recommended Cutting Parameters (Metric vs Imperial)
| Parameter Metric | Metric Values | Parameter Imperial | Imperial Values |
|---|---|---|---|
| Cutting Speed (Vc) | 120 - 240 m/min | Cutting Speed (SFM) | 390 - 785 SFM |
| Feed Rate (f) | 0.15 - 0.40 mm/rev | Feed Rate (IPR) | 0.006 - 0.016 ipr |
| Depth of Cut (ap) | 0.5 - 3.0 mm | Depth of Cut (DOC) | 0.020 - 0.118 inch |
This insert securely pairs with premium industrial external and internal boring bars. Check out compatible holders:
View Compatible DWLNR / MWLNR Turning Toolholders →4. Product Application Scenarios
This premium industrial insert delivers elite execution standards across primary heavy manufacturing fields:
- Aerospace Systems: Roughing and finishing operations on SUS304 and SUS316 structural component connections.
- Oil & Gas Hardware: Precision single-point continuous profiling of high-alloy marine pump shafts and valves.
- Automotive Parts Assembly: High-speed production machining of cast and forged stainless steel turbocharger manifolds.
5. Compatibility & Rigidity Standards
Engineered for deployment across all heavy-duty industrial multi-axis CNC lathes, vertical turning centers (VTL), and standard conventional turning machinery. Optimal tracking results are achieved on rigid platforms like Mazak, DMG Mori, Okuma, Haas, and Doosan multi-tasking centers. Maintain high-volume, pressure-fed flood coolant distribution directly to the cutting vertex for max tool lifespan.
6. Grade Cross-Comparison Matrix
Understand how the Sumitomo AC6040M grade compares across different major international insert standards:
| Manufacturer Brand | Equivalent Grade Designation | ISO Application Window |
|---|---|---|
| SUMITOMO | AC6040M (Primary Target) | ISO M30 - M40 (High Toughness) |
| Sandvik Coromant | GC2025 / GC2220 | ISO M25 - M35 |
| Kennametal | KCU25 / KCM35B | ISO M20 - M40 |
| ZCC.CT | YBG205 / YBM253 | ISO M20 - M35 |
7. Global Procurement Trust
We source our carbide stock inventory directly through official distribution pathways. We provide verifiable certificate tracking data for every premium industrial production batch shipped worldwide.
💬 Real Global Machinist Reviews
"We switched out our older grade inserts for these AC6040M tips on a long run of 316L pump flanges. Tool longevity shot up by almost 45%. Outstanding resistance against severe structural notch wear."
"Sehr gut! Chip control with the SU geometries on medium feed speeds is flawless. No chip nesting loops around the toolholders inside our Index lathe setups."
"Excellent performance parameters on tough Duplex steel parts. Surface finish matches specifications perfectly. Highly economical 6-edged tooling layout."
"流石住友のAC6040M。ステンレス加工時の境界摩耗が大幅に減少しました。このSUブレーカは切り屑の処理能力が非常に高く、無人運転ラインでも非常に安定して使用できます。リピート確定。"
"Original product quality. Quick logistical shipping handling to our facility. Very reliable tool life tracking when turning stainless parts."
8. Machining FAQ (Expert Troubleshooting)
Q: What workpiece materials is the Sumitomo AC6040M grade designed to cut?
A: The AC6040M PVD grade is engineered specifically for ISO M-class workpieces, including austenitic stainless steel (e.g., 304, 316), martensitic/ferritic alloys, and challenging high-strength Duplex stainless steels. It can also handle light interrupted cuts in these groups.
Q: How does the SU chipbreaker design compare to other variations like EU or GU?
A: The SU groove is a specialized medium-duty geometry that prioritizes chip control on sticky materials. It balances a sharp cutting edge with high fracture strength, providing lower cutting resistance than standard general-purpose GU chipbreakers when machining tough stainless steels.
Q: Can I run this WNMG080408 insert dry or without coolant?
A: Wet machining with flood or high-pressure coolant is highly recommended. Stainless steel generates intense localized heat, and continuous coolant prevents thermal cracking of the PVD layer while ensuring consistent chip flushing from the cutting path.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Compatibility Matrix: Optimized for ISO M30–M40 Stainless Steel profiles. Acceptable performance in secondary applications for ISO S-class high-temperature superalloys.
Machining Troubleshooting Tips: If you encounter rapid depth-of-cut notch wear, increase your feed rate slightly or use a variable depth-of-cut path strategy to shift stress points along the micro-honed edge. If micro-chipping occurs, check your setup's rigidity and reduce the cutting speed (Vc) by 10-15%.
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.