SUMITOMO WNMG080404N-EX AC6040M (WNMG 431-EX) Carbide Stainless Steel Turning Insert
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SUMITOMO WNMG080404N-EX AC6040M (WNMG 431-EX) PVD Carbide Interrupted Stainless Steel Turning Insert
1. Product Overview
"Which indexable carbide insert grade and roughing chipbreaker geometry provide the ultimate thermal shock resistance and edge toughness during heavy, wet interrupted turning of exotic stainless steels?"
The SUMITOMO WNMG080404N-EX AC6040M (internationally designated in imperial size benchmarks as WNMG 431-EX) is an industrial-grade, double-sided negative 80° trigon indexable turning insert engineered for heavy roughing, variable depths of cut, and severely interrupted machining of austenitic, martensitic, and duplex stainless steels (ISO M35 - M40 classification). Featuring Sumitomo's proprietary Absotech PVD coating layer, the AC6040M grade provides twice the thermal cracking resistance of conventional coatings, making it the premier choice for wet interrupted cutting. Paired with the highly stable, heavy-feed EX Type Chipbreaker geometry, this insert efficiently shears through work-hardening layers, eliminates stringy bird-nesting chips, and delivers highly predictable tool life during aggressive metal removal operations.
2. Product Key Features
- Absotech PVD Multi-Layer Technology: Deploys a highly dense, stress-controlled TiAlN-based PVD architecture. This layer serves as an elite thermal barrier, dramatically suppressing thermal fatigue cracking induced by repetitive coolant quenching during interrupted passes.
- Heavy-Duty EX-Type Rake Profile: Engineered with a reinforced cutting edge land and a wide chip-breaking basin. The EX geometry balances sharp shearing with robust edge strength to control boundary notch wear and resist built-up edge (BUE) formation.
- High-Toughness Substrate Compounding: Features a specialized tungsten carbide-cobalt matrix tailored for high impact energy absorption. This structure prevents premature catastrophic fracturing when cutting out-of-round stainless forgings or cast components.
- 6 Cost-Efficient Indexable Edges: The negative 80-degree structural trigon layout yields 6 distinct cutting corners per insert, delivering elite processing economy and maximizing shop floor cost savings.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Nomenclature Decoding Matrix
Trigon Shape (80°)
0° Relief Angle
M-Class Tolerance
With Hole & Slots
Edge Length (9.525mm)
Thickness (4.76mm)
Nose Radius (0.4mm)
Heavy Roughing
| Dimension Parameter | Metric Specification (ISO) | Imperial Specification (ANSI) |
|---|---|---|
| Inscribed Circle (IC) | 9.525 mm | 0.375 in (3/8") |
| Thickness (S) | 4.76 mm | 0.187 in (3/16") |
| Corner Nose Radius (re) | 0.4 mm | 0.0156 in (1/64") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150 in |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed (vc) | Feed Rate (f) |
|---|---|---|
| Austenitic Stainless Steel (SUS304 / SUS316 Roughing) | 80 - 160 m/min (260 - 525 SFM) | 0.20 - 0.45 mm/rev (0.008 - 0.018 ipr) |
| Duplex Stainless Steels (SUS329J4L / 2205 Interrupted) | 50 - 120 m/min (165 - 395 SFM) | 0.15 - 0.35 mm/rev (0.006 - 0.014 ipr) |
This WNMG0804 / WNMG431 indexable matrix requires standard external or internal negative turning toolholders with a 95° approach angle.
Browse Matching MWLNR/L & WWLNR/L Toolholders →4. Product Application Scenarios
The AC6040M tough stainless grade delivers premium operational security across demanding machining environments:
5. Toolholder & Equipment Compatibility
Strictly compliant with indexable geometric standard pocket seating, this insert integrates natively into global standard hardware:
- External Shank Holders: MWLNR2020K08, MWLNR2525M08, WWLNR2525M08 (Metric) / MWLNR16-4B, WWLNR16-4B (Imperial).
- Boring Bars (Internal): A32S-MWLNR08, A40T-MWLNR08 (Minimum bore clearance diameter >= 40mm).
- Lathe Integration: Optimized for high-rigidity CNC turning centers (Mazak, DMG Mori, Okuma, Haas) utilizing high-volume flood coolant delivery to maximize chip clearing.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Properties |
|---|---|---|---|
| SUMITOMO | AC6040M (Target) | ISO M35 - M40 / Maximum Interrupted Wet Stainless Roughing | Absotech Tough High-Adhesion PVD Matrix |
| Sandvik Coromant | GC2035 / GC2220 | ISO M35 / Severe Interrupted Stainless Cut | PVD multi-layer coating technology |
| Kennametal | KCPM30 / KMS40 | ISO M35 - M40 / Shock-Resistant Stainless Machining | Advanced AlTiN PVD Coating Matrix |
| Iscar | IC6025 / IC806 | ISO M30 - M40 / High-Impact Stainless Turning | TiAlN PVD Coating System |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving structural edge stability and wear control under heavy impact:
"We rough turn duplex stainless pump components with dynamic interrupted cuts. Standard inserts cracked prematurely from thermal stress. Sumitomo's AC6040M grade handles the thermal cycling beautifully—stable edge wear and no micro-chipping."
"Sehr gut geeignet für raue, unterbrochene Schnitte bei rostfreiem Stahl. Die Standzeit bei Nassbearbeitung ist im Vergleich zu anderen PVD-Platten verdoppelt."
"Il rompitruciolo EX fa un lavoro fantastico a forti avanzamenti. Eccellente controllo truciolo su acciaio inox 316."
"ステンレスの強断続加工で圧倒的な信頼性があります。熱亀裂によるチッピングが劇的に減少し、加工表面も安定しています。"
8. Technical Machining FAQ
Q: What makes the AC6040M grade superior for wet interrupted cutting compared to older PVD grades?
A: Interrupted wet turning subjects the cutting edge to extreme thermal cycles (heating up during the cut, quenching in coolant between gaps). Conventional coatings develop thermal shock cracks that quickly lead to chipping. The AC6040M grade utilizes an advanced Absotech PVD coating that manages residual stresses, resulting in double the thermal crack resistance of standard PVD alternatives.
Q: How does the EX chipbreaker improve performance in gummy stainless materials?
A: Gummy materials like austenitic stainless steel are prone to producing long, continuous stringy chips that can wrap around the workpiece. The EX chipbreaker incorporates a sharp, positive shearing edge backed by a robust deflector wall that forces short, curled chip breakage even at higher feeds, protecting both the tool pocket and the operator.
Q: Can this insert be used for finishing passes?
A: The EX profile is explicitly engineered for medium-to-heavy roughing applications. Running it at very low depths of cut (under 1.0mm) may lead to poor chip control and increased friction. For high-precision finishing operations, a lighter geometric style like Sumitomo's EM or EG deflector should be selected.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain spans ISO M30 to M40 parameters. Specifically optimized for continuous-to-heavily interrupted cutting of austenitic stainless steels (SUS304, SUS316), duplex stainless variations (2205, 2507), and precipitation-hardening structural alloys.
Machining Troubleshooting Guide: If advanced built-up edge or workpiece tearing occurs, increase your cutting speed (vc) to escape the adhesion zone. If rapid mechanical chipping occurs at the nose radius, verify the rigidity of the turning spindle setup, reduce the feed rate (f), or switch to an 0.8mm nose radius variant (WNMG080408N-EX).
Authorized Reference Documentation & Endorsements: Sizing allocations, mounting tolerances, and technical designations are fully compliant with the ISO 1832:2017 industrial manufacturing standard. Layer adhesion parameters, metallurgical stress control thresholds, and mechanical performance metrics are validated against documented tool testing data published by Sumitomo Electric Hardmetal Corp.
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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.