SUMITOMO VNMG160412N-GU AC820P Indexable Turning Insert for Steel Machining (VNMG 160412 / VNMG 333 Equivalent)
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SUMITOMO VNMG160412N-GU AC820P CVD Coated Carbide Indexable Turning & Profiling Insert
1. Product Overview
"Which indexable carbide insert grade and chipbreaker geometry are best optimized for medium-to-rough steel profiling, copy turning, and high-speed outer diameter cutting where plastic deformation resistance and predictable tool life are required?"
The SUMITOMO VNMG160412N-GU AC820P is a premium industrial-grade 35° rhombic double-sided indexable turning insert engineered specifically for aggressive metal removal rates (MRR) in steel turning applications. Designed for ISO P15–P35 material spectrums including carbon steels, alloy steels, and mold steels, this insert utilizes Sumitomo's proprietary AC820P Absotech Platinum CVD Coating Technology. By integrating an ultra-thick, highly textured $\alpha$-$\text{Al}_2\text{O}_3$ (Alumina) and TiCN crystal coating layer, it achieves extraordinary resistance to crater wear and heat dissipation. The integrated -GU Type Chipbreaker features a variable-depth rake face geometry engineered to control chips seamlessly during variable depths of cut (DOC), preventing chip wrapping disasters on CNC lathes and maximizing machine uptime.
2. Product Key Features
- Absotech Platinum CVD Technology: Features a smoothed, stress-released outer coating layer that drastically reduces micro-chipping, adhesion, and built-up edge (BUE) formation.
- Excellent Plastic Deformation Resistance: The specialized gradient carbide substrate maintains extreme structural rigidity at high thermal thresholds, enabling stable high-speed dry or wet machining.
- High-Performance -GU Chip Control: Optimizes chip curling over a broad feed rate range, making it highly versatile for transitioning from semi-finishing to rough profiling.
- Double-Sided Efficiency: Provides 4 distinct cutting edges per insert, delivering lower cost-per-edge metrics without compromising dimensional repeatability.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Industrial Nomenclature Decoding Matrix
| Dimension Parameter | Metric Specification (ISO) | Imperial Equivalent Benchmark (ANSI) |
|---|---|---|
| Product Designation Model | VNMG160412N-GU | VNMG 333-GU (VNMG333) |
| Inscribed Circle (IC) Diameter | 9.525 mm | 0.375 in (3/8") |
| Insert Thickness (s) | 4.76 mm | 0.1875 in (3/16") |
| Nose Corner Radius ($r_{\epsilon}$) | 1.2 mm | 0.0469 in (3/64") |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed ($v_c$) | Feed Rate per Revolution ($f$) / Depth ($a_p$) |
|---|---|---|
| Mild & Carbon Steels (AISI 1018 / 1045) | 180 - 350 m/min (590 - 1150 SFM) | 0.20 - 0.50 mm/rev (0.008 - 0.020 ipr) ap: 1.5 - 4.5 mm (0.060 - 0.177 in) |
| Alloy Steels / Die Steels (AISI 4140 / 4340 / D2) | 140 - 280 m/min (460 - 920 SFM) | 0.15 - 0.45 mm/rev (0.006 - 0.018 ipr) ap: 1.0 - 4.0 mm (0.040 - 0.157 in) |
This VNMG160412 turning matrix requires compatible external or internal profiling toolholders engineered with negative 35-degree pocket seats.
Browse Matching MVJNR / MVQNR / MVUNR Toolholders →4. Product Application Scenarios
The AC820P CVD coated turning grade provides outstanding productivity metrics across demanding heavy engineering sectors:
5. Toolholder & Equipment Compatibility
Strictly compliant with indexable pocket standards, this insert integrates seamlessly into global standard milling and drilling systems:
- Turning Toolholder Assemblies: Universally compatible with all standard MVJNR, MVJNL, MVQNR, MVUNR, and internal boring bars configured for standard VNMG 1604 / VNMG 33 pocket shapes.
- CNC Lathe Compatibility: Optimally balanced for standard CNC lathes, turn-mill centers, and multi-axis machines (Mazak, Okuma, Mori Seiki, Doosan, Haas) featuring rigid hydraulic clamping blocks.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Technology |
|---|---|---|---|
| SUMITOMO | AC820P (Target) | ISO P15 - P35 / General to Medium Steel Turning Operations | Absotech Platinum thick Al2O3-TiCN Premium CVD Layer |
| Sandvik Coromant | GC4325 / GC4425 | ISO P15 - P35 / Broad Steel Turning Target Matrix | Inveio® Alumina Crystal Coating Coating System |
| Kennametal | KCP25B / KCP30B | ISO P20 - P40 / High Feed Structural Steel Turning | KTiN + Multi-phase CVD Al2O3 Wear Shielding |
| Iscar | IC8250 / IC8150 | ISO P20 - P35 Heavy Semi-Finishing to Roughing | SUMO TEC high-adhesion CVD Al2O3-TiCN matrix |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop data proving reliable edge toughness and high metal removal rates under rigorous milling tasks:
"Running the VNMG 333-GU on 1045 hot rolled bars. The Absotech coating handles the abrasive outer crust easily without immediate flank wear. We hit speeds around 950 SFM and the chips break into tight 9-shapes exactly as expected. Consistently getting 35 pieces per corner."
"Sehr gute Maßhaltigkeit beim Kopierdrehen von legiertem Stahl (42CrMo4). Die Schnittkante bleibt dank AC820P extrem stabil gegen plastische Deformation, selbst bei hohen Schnitttemperaturen im Trockenschnitt."
"Ottimo controllo del truciolo con il rompitruciolo -GU su passate di sgrossatura media. La finitura superficiale rimane costante e prevedibile per tutta la durata del tagliente."
"S45Cの倣い加工において、他社品で発生していた境界摩耗がAC820Pでは劇的に改善されました。1.2mmアールチップは強度が抜群で、連続荒切削でも非常に信頼できます。"
8. Technical Machining FAQ
Q: Is the VNMG160412N-GU insert recommended for heavy interrupted cutting conditions?
A: The AC820P grade features a robust balancing matrix tailored primarily for stable continuous turning and moderate interruptions. For extreme, heavy-impact interrupted cutting sequences, the tougher Sumitomo AC830P grade is recommended.
Q: What parameters define the optimal operating envelope for the -GU chipbreaker?
A: The -GU geometry operates optimally within a depth of cut (DOC) between 1.0mm and 5.0mm, paired with a feed rate ranging from 0.15 to 0.50 mm/revolution, acting as a superb single-tool choice for medium sizing and raw roughing.
Q: Why does the Sumitomo Absotech coating improve machining performance on carbon steels?
A: The Absotech design utilizes a highly smooth, orientation-controlled Alumina layer that reduces friction coefficient values. This mitigates cutting heat transfer into the substrate core, drastically extending wear boundaries.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Main application range covers ISO P15 to P35 spectrum architectures. Engineered for high carbon steels (S45C/S50C), alloy tool steels (4140, 4340, Cr-Mo structures), and structural metal alloys under high velocity machining indexes.
Machining Troubleshooting Guide: If rapid crater wear or top face cratering develops, decrease the cutting speed ($v_c$) or switch to high pressure flood coolant application. If mechanical chipping appears on the structural nose radius ($1.2\text{mm}$ tip), audit the work holding stiffness, minimize vibrations, or reduce the entry feed rate per revolution ($f$).
Authorized Reference Documentation & Endorsements: Structural dimensions, radius parameters, and tool classification rules adhere fully to official international industrial coding conventions. Mechanical wear thresholds and tool coating behavior parameters are verified according to published reference data sheets from Sumitomo Electric Hardmetal Engineering Laboratories.
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.