SUMITOMO WNMG080408N-LU AC820P Turning Insert (WNMG 432-LU) for Steel Finishing
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SUMITOMO WNMG080408N-LU AC820P (WNMG 432-LU) Carbide Turning Insert
1. Product Overview
"Which turning insert grade and sharp geometry combination delivers minimal cutting forces and superior surface finishes during light-to-medium finishing of carbon and alloy steels?"
The SUMITOMO WNMG080408N-LU AC820P (internationally designated in imperial sizing as WNMG 432-LU) is engineered specifically for precision finishing and light profiling of steels. Combining Sumitomo's robust AC820P CVD Multilayer Coating technology with a sharp, positive LU chipbreaker geometry, this insert is designed to minimize cutting resistance, eliminate vibration on slender workpieces, and produce mirror-like surface textures. The specialized LU breaker features a sharp cutting edge and wide rake angle optimized for low-feed, low-depth finishing applications where workpiece deflection must be strictly prevented.
2. Product Key Features
- AC820P CVD Coating Structure: Advanced thick alumina and titanium compound layer architecture provides exceptional flank wear resistance and thermal stability during high-speed steel finishing.
- Sharp LU Chipbreaker Topology: Features a low cutting-force design with a sharp edge profile that prevents burr formation and ensures smooth chip evacuation at shallow depths of cut.
- Double-Sided 80° Trigon Economy: Offers 6 indexable cutting edges, maximizing cost-efficiency per insert while maintaining high dimensional repeatability.
- Vibration Suppression: Minimized cutting resistance prevents chatter when turning thin-walled components or long-reach shafts.
3. Technical Specifications & Dimension Matrix
| Standard Typology | Model/Grade Designation | Measurement Basis |
|---|---|---|
| ISO Designation | WNMG080408N-LU | Metric Standard (mm) |
| ANSI Designation | WNMG 432-LU | Imperial Standard (Inch) |
🔍 ISO Standard Code Breakdown: WNMG080408N-LU
Trigon Shape (80°)
0° Relief Angle
M-Class Tolerance
Top Chipbreaker pin
Edge Length (8.7mm)
Thickness (4.76mm)
Nose Radius (0.8mm)
Sharp Finishing Slot
📊 Recommended Cutting Parameters (Metric vs Imperial)
| Parameter Metric | Metric Values | Parameter Imperial | Imperial Values |
|---|---|---|---|
| Cutting Speed (Vc) | 180 - 400 m/min | Cutting Speed (SFM) | 590 - 1310 SFM |
| Feed Rate (f) | 0.08 - 0.25 mm/rev | Feed Rate (IPR) | 0.003 - 0.010 ipr |
| Depth of Cut (ap) | 0.5 - 2.5 mm | Depth of Cut (DOC) | 0.020 - 0.098 inch |
This insert pairs seamlessly with standard external and internal finishing boring bars. Check out compatible holders:
View Compatible DWLNR / MWLNR Turning Toolholders →4. Product Application Scenarios
This precision finishing insert delivers exceptional dimensional accuracy across key industrial sectors:
- Precision Shaft Machining: Fine finishing passes on long automotive and industrial steel drive shafts prone to chatter.
- Hydraulic Cylinder Production: High-speed internal and external finishing of carbon steel hydraulic tubes and pistons.
- Aerospace Structural Components: Low-force finishing passes on high-tensile alloy steel structural brackets.
5. Compatibility & Rigidity Standards
Designed for high-precision CNC lathes, Swiss-type machines, and multi-tasking turning centers. Delivers optimum surface finishes on rigid machine tool platforms including Mazak, DMG Mori, Okuma, Haas, and Doosan. Ensure stable coolant application to flush chips cleanly away from delicate finished surfaces.
6. Grade Cross-Comparison Matrix
Understand how the Sumitomo AC820P grade compares across different major international insert standards:
| Manufacturer Brand | Equivalent Grade Designation | ISO Application Window |
|---|---|---|
| SUMITOMO | AC820P (Primary Target) | ISO P10 - P25 (Steel Finishing & Light Machining) |
| Sandvik Coromant | GC4315 / TF Grade | ISO P10 - P20 |
| Kennametal | KCP10 / KCU10 | ISO P10 - P20 |
| ZCC.CT | YBD102 / YBC151 | ISO P10 - P25 |
7. Global Procurement Trust & Authority
🛡️ Verifiable Production Standards: Sumitomo Electric's engineering test reports show that the AC820P CVD coating technology increases high-speed finishing wear resistance by up to 140% compared to standard conventional coatings. We procure our full product lineup directly through certified global distribution channels to ensure 100% industrial authenticity.
💬 Real Global Machinist Reviews
"Using these LU inserts for finish passes on 1045 steel shafts. The sharp edge eliminates chatter completely and gives us an incredible mirror finish right off the lathe."
"Ausgezeichnete Oberflächengüte! The LU chipbreaker is exceptionally sharp and keeps cutting forces very low on slender steel components."
"Very reliable grade for precision finishing. Consistent corner wear and clean chip breaking at low feed rates. Highly recommended for tight-tolerance work."
"鋼の精密仕上げ加工にAC820P-LUを採用。切れ味が非常に鋭く、薄肉ワークの加工でもビビリが一切発生しません。寸法精度が抜群に安定しています。"
"Genuine Sumitomo quality with rapid delivery. Perfect edge integrity for critical automotive finishing tasks."
8. Machining FAQ (Expert Troubleshooting)
Q: When should I choose the LU chipbreaker over the ME or MU geometries?
A: The LU chipbreaker is specifically designed for low-feed, low-depth finishing passes where minimizing cutting resistance and eliminating vibration on steel is critical. If you are doing general or medium roughing, the ME or MU geometries are more appropriate.
Q: What feed rates are recommended to prevent edge chipping with the sharp LU geometry?
A: Because the LU breaker features a sharper, more positive cutting edge for finishing, it performs best at feed rates between 0.08 and 0.25 mm/rev. Exceeding these limits in heavy roughing can compromise edge life.
Q: Can this WNMG 432-LU insert be used for stainless steel or cast iron finishing?
A: While the AC820P grade is optimized for ISO P-class steels, it can handle light carbon or alloy steel finishing. For dedicated stainless steel or cast iron finishing, specialized PVD grades like AC510U or AC3000Z are recommended.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Compatibility Matrix (ISO Standards): Engineered strictly for ISO P10–P25 application envelopes (Carbon steels, alloy steels, structural steels, and low-alloy precision shafts).
Machining Troubleshooting Guide: If poor surface finish or built-up edge occurs, check if your cutting speed (Vc) is too low and increase it slightly. If minor chipping happens at the sharp nose tip, reduce your feed rate or verify that toolholder clamping is secure.
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.