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%.
Need Help With Sumitomo Inserts?
Looking for a Sumitomo equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This Sumitomo insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.