SUMITOMO WNMG080402N-FE AC6040M (WNMG 430.5-FE) Interrupted Stainless Steel Turning Insert
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SUMITOMO WNMG080402N-FE AC6040M (WNMG 430.5-FE) Absotech PVD Carbide Interrupted Stainless Steel Finishing Turning Insert
1. Product Overview
"Which indexable carbide insert grade and high-precision finishing chipbreaker geometry deliver the absolute best tool life, thermal shock resistance, and micro-chipping control during heavily interrupted or unstable finishing cuts on tough austenitic and duplex stainless steels?"
The SUMITOMO WNMG080402N-FE AC6040M (internationally designated in imperial benchmarks as WNMG 430.5-FE) is a premium industrial-grade, double-sided negative 80° trigon indexable turning insert engineered explicitly for high-precision finishing, light profiling, and interrupted machining of challenging stainless steel alloys (ISO M30 - M40 classification). Utilizing Sumitomo's pioneering Absotech PVD coating technology, the AC6040M grade incorporates a highly specialized TiAlN ultra-dense crystal layer coupled with an ultra-tough carbide substrate. This specific combination yields unparalleled thermal shock resistance and adhesion suppression under cyclic cooling and high mechanical impacts. Paired with the highly engineered FE Type Finishing Chipbreaker geometry, this insert features a uniquely balanced micro-honed cutting edge land that lowers cutting forces, controls stringy chip nesting under minimal depths of cut, and ensures exceptional surface finish quality (Ra value control) even under interrupted conditions.
2. Product Key Features
- Absotech PVD Ultra-Dense Technology: Implements a highly engineered, stress-controlled thin-film PVD architecture. It forms a supreme thermal shield that resists thermal shock fatigue caused by cyclic coolant exposure during high-speed interrupted passes.
- Optimized FE-Type Finishing Geometry: Features a specialized positive land profile and variable chip deflector walls. The FE profile optimizes shearing efficiency to suppress cutting zone heat while maintaining excellent chip curling characteristics during light turning cuts.
- Advanced Impact-Resistant Core: Built on a specialized fine-grained tungsten carbide-cobalt substrate tailored for exceptional high-temperature yield strength. It guarantees pocket seat reliability and structural preservation under heavy tool pressure.
- 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
| 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) | 0.2 mm | 0.0078 in (1/128") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150 in |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed (vc) | Feed Rate (f) / Depth of Cut (ap) |
|---|---|---|
| Interrupted Austenitic Stainless Steel (SUS304 / SUS316) | 120 - 200 m/min (390 - 650 SFM) | 0.04 - 0.12 mm/rev (0.0015 - 0.005 ipr) ap: 0.15 - 1.0 mm (0.006 - 0.039 in) |
| Interrupted Duplex Stainless Steel (2205 / Super Duplex) | 80 - 140 m/min (260 - 460 SFM) | 0.04 - 0.10 mm/rev (0.0015 - 0.004 ipr) ap: 0.15 - 0.8 mm (0.006 - 0.031 in) |
This WNMG0804 / WNMG430.5 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 heavy interrupted fine-turning grade offers premium security across geometric profiles with cross-holes or splines:
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 and heat dissipation.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Properties |
|---|---|---|---|
| SUMITOMO | AC6040M (Target) | ISO M30 - M40 / Heavily Interrupted High-Toughness Stainless Steel | Absotech PVD Ultra-Tough TiAlN Crystal Structural Layer |
| Sandvik Coromant | GC2220 / GC2035 | ISO M35 / Stainless Interrupted Finishing | PVD multi-layer high-toughness thin film |
| Kennametal | KCM25B / KCM35B | ISO M30 - M40 / Shock-Resistant Stainless Machining | High-toughness PVD AlTiN coating system |
| Iscar | IC806 / IC6025 | ISO M30 - M40 / High-Impact Interrupted Stainless Turning | PVD hard coating layer with high edge security |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving absolute dimensional accuracy and chip breaking efficiency under minimal loads:
"We machine cast 316 stainless pump bodies with bolt holes. Standard finishing inserts used to shatter instantly when hitting the holes at high speeds. The WNMG080402N-FE in the AC6040M grade has been a complete game changer. The 0.2mm radius produces an elite surface finish, and the substrate handles the constant hammering without a single macro-chipping failure."
"Hervorragende Zähigkeit bei unterbrochenem Schnitt. Die Absotech PVD-Beschichtung weist eine enorme thermische Rissbeständigkeit auf. Selbst bei intensiver Emulsionskühlung bleibt die Schneidkante stabil und frei von Mikroausbrüchen. Der FE-Brecher hält die Schnittkräfte minimal."
"Ottimo controllo del truciolo su passate sottili con interruzione. Finitura superficiale eccellente grazie al raggio 0.2 mm. Consiglio vivamente il grado AC6040M per stabilità."
"ピンホールの開いたステンレスシャフトの仕上げ旋削に使用。R0.2なので削り込みもシャープで、断続加工特有の熱亀裂が全く発生しません。AC6040Mの強靭性は他社を圧倒しています。"
8. Technical Machining FAQ
Q: What is the primary operational difference between the Sumitomo AC6030M and AC6040M grades?
A: The AC6030M is a CVD grade optimized for continuous, high-speed general turning focusing on maximum wear resistance. The AC6040M is a high-toughness PVD grade specifically tailored for heavily interrupted, unstable, or low-speed machining where thermal cracking and chipping resistance are critical.
Q: Why choose a 0.2mm corner radius (WNMG080402 / WNMG430.5) over a 0.4mm radius?
A: The 0.2mm corner radius significantly reduces radial cutting forces, making it exceptionally suited for thin-walled parts, ultra-fine finishes, or preventing vibrations on long, slender workpieces, while easily breaking chips at very tight depths of cut.
Q: How does the FE chipbreaker manage chip control under shallow cuts?
A: The FE geometry features a micro-precision raised deflector ridge located close to the ultra-sharp edge. This unique topography forces tiny, thin chip cross-sections to curl tightly and snap cleanly, avoiding the continuous "bird-nesting" ribbons common to stainless finishing.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain covers ISO M30 to M40 parameters. Explicitly optimized for stable-to-heavily interrupted precision finishing of austenitic stainless steel (304, 316, 316L), ferritic/martensitic stainless steel (410, 420), and high-strength duplex/super duplex alloys under severe conditions.
Machining Troubleshooting Guide: If early flank wear appears, consider slightly reducing the cutting speed (vc). If the insert corners exhibit chipping during heavy interruptions, ensure the tool holder pocket clamp torque is secure, or marginally increase the feed rate (f) to utilize the full strength of the FE edge land.
Authorized Reference Documentation & Endorsements: Dimensional configurations, pocket seating tolerances, and naming structures fully comply with the international ISO 1832:2017 industrial standards blueprint. Mechanical strength thresholds, thermal crack criteria, and wear tolerances are cross-referenced from verified test catalogs 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.