SUMITOMO WNMG080404N-GU AC820P (WNMG 431-GU) Carbide Turning Insert
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SUMITOMO WNMG080404N-GU AC820P (WNMG 431-GU) High-Speed CVD Carbide Steel Medium Turning Insert
1. Product Overview
"Which indexable carbide insert grade and chipbreaker configuration are best suited to achieve a highly stable tool life and superior chip evacuation during high-speed, general-purpose medium turning of carbon and alloy steels?"
The SUMITOMO WNMG080404N-GU AC820P (known in imperial nomenclature as WNMG 431-GU) is a premium double-sided negative 80° trigon indexable turning insert engineered for general-purpose to medium-rough steel turning. Leveraging Sumitomo’s industry-leading Absotech Platinum CVD coating technology, the AC820P grade provides an unparalleled balance of thermal barrier protection and edge toughness. Combined with the low-cutting-force GU Type Chipbreaker geometry, this insert eliminates crater wear, manages difficult chip nesting, and delivers exceptional dimensional accuracy under broad cutting conditions.
2. Product Key Features
- Absotech Platinum CVD Technology: Features a highly engineered micro-structured Al2O3-TiCN coating layer with enhanced crystal grain orientation. This specialized layout dramatically reduces adhesion-induced chipping and offers superior flank wear protection during continuous high-temperature machining.
- Versatile GU-Type Medium Chipbreaker: Formulated with an optimized rake angle and a curved deflector wall. It lowers cutting resistance by up to 15% compared to conventional geometries, smoothly curling and evacuating chips over a broad range of depths of cut and feeds.
- High-Density Tough Carbide Matrix: The AC820P grade incorporates a structural gradient cemented carbide substrate that prevents plastic deformation at high cutting feeds while maintaining exceptional shock resistance across light interrupted cuts.
- 6 Highly Economical Cutting Edges: Designed with a negative structural configuration, maximizing operational cost-efficiency with 6 distinct indexable cutting corners per insert without compromising the strength of the pocket seat.
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)
Medium Breaker
| 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 Structural Cutting Parameters
| Workpiece Material Category | Cutting Speed (vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steels (1045, S45C Structural Machining) | 180 - 350 m/min (590 - 1150 SFM) | 0.12 - 0.40 mm/rev (0.005 - 0.016 ipr) |
| Alloy Steels (4140, 8620, SCM440 Medium Turning) | 140 - 280 m/min (460 - 920 SFM) | 0.10 - 0.35 mm/rev (0.004 - 0.014 ipr) |
This WNMG0804 / WNMG431 sequence 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 AC820P universal steel turning grade delivers optimized stability across multi-industry production runs:
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 diameter >= 40mm).
- Machine Support Guidelines: Engineered for modern CNC turning centers and multi-axis Swiss-style or live-tool lathes running stable clamping configurations to avoid harmonic chatter.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Technology |
|---|---|---|---|
| SUMITOMO | AC820P (Target) | ISO P15 - P25 / Mainstream Universal Steel Turning | Absotech Platinum CVD Al2O3-TiCN |
| Sandvik Coromant | GC4325 / GC4425 | ISO P15 - P25 / High-Efficiency Steel Machining | Inveio CVD Coating Layer |
| Kennametal | KCP25B | ISO P20 - P30 / Structural Steel Component Cutting | KBI CVD Diamond-Like Matrix |
| Iscar | IC8250 | ISO P15 - P30 / Medium General Cut | CVD Multi-Layer Alpha Oxide |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving exceptional chip control and edge life:
"We were running these on 1045 forgings. The GU chipbreaker clears the chips flawlessly without stringing up around the chuck. The tool life on the AC820P grade easily beat our previous supplier by 30%."
"Hervorragende Standzeit bei der Bearbeitung von legiertem Stahl. Absotech-Beschichtung hält extrem hohe Temperaturen aus, ohne zu verschleißen."
"Ottimo inserto per sgrossatura leggera e finitura. Il controllo del truciolo è perfetto su CNC Mazak."
"SCM440の中荒削り加工で大活躍しています。AC820Pは耐摩耗性と耐欠損性のバランスが非常に良く、チッピングによる突然の刃先破損が激減しました。GUブレーカーのおかげで切削抵抗も低く、安定した連続加工が可能です。"
8. Technical Machining FAQ
Q: What makes the AC820P grade the primary recommendation for general steel turning?
A: The AC820P grade represents Sumitomo’s baseline universal standard for steel turning (ISO P15-P25). It bridges the gap between the ultra-hard AC810P (optimized for high-speed continuous finishing) and the high-toughness AC830P (optimized for heavy mechanical interruptions). It provides excellent resistance to both plastic deformation and thermal cratering, making it the safest choice for high productivity across mixed steel batches.
Q: How does the GU chipbreaker perform under varying depths of cut?
A: The GU chipbreaker is a highly versatile medium-range configuration. Its positive rake design yields lower tool cutting forces while maintaining robust edge strength. It breaks chips efficiently at depths of cut ranging from 0.5mm up to 3.0mm, preventing bird-nesting even during variable feed adjustments.
Q: Should I run the WNMG080404N-GU AC820P wet or dry?
A: Thanks to the advanced thermal barrier properties of the Absotech Platinum CVD coating, this insert runs exceptionally well under dry cutting conditions at elevated cutting speeds. However, if you choose to use flood coolant to control workpiece thermal expansion over long components, ensure the coolant volume is highly consistent to eliminate thermal micro-cracking.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain spans ISO P15 to P25 environments. Engineered for medium profiling, facing, and turning of mild carbon steels, unalloyed structural steels (1045, S45C), and structural alloy steel blocks (4140, 8620, SCM440).
Machining Troubleshooting Guide: If rapid crater wear or nose melting occurs, check that your surface cutting speed (vc) is calibrated to the material brinell hardness, or lower the speed slightly. If the indexable cutting edge experiences sudden chipping or premature pocket failure, verify the machine’s toolholder clamping rigidity or switch to a higher-toughness AC830P grade matrix.
Authorized Reference Documentation: Sizing constraints, indexable pocket seating parameters, and insert structural tolerances are fully compliant with the international ISO 1832:2017 regulatory framework. Cutting speeds and mechanical performance baselines are cross-referenced with authorized engineering datasets published by Sumitomo Electric Hardmetal Corp.
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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.