SUMITOMO VNMG160408N-SU AC830P Carbide Turning Insert for Steel Profiling (VNMG 160408 / VNMG 332 Equivalent)
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SUMITOMO VNMG160408N-SU AC830P CVD Coated Carbide Indexable Turning & Profiling Insert
1. Product Overview
"Which indexable carbide insert grade and chipbreaker geometry are best optimized for stable finishing to medium steel profiling, maintaining dimensional accuracy during interrupted cuts, and preventing chip wrapping on long carbon steel shafts?"
The SUMITOMO VNMG160408N-SU AC830P is a premium, high-precision 35° rhombic double-sided indexable turning insert engineered for high-performance finishing to medium profiling applications in tough steel environments. Designed for the ISO P20–P40 material spectrum (including carbon steels, low-alloy steels, structural steels, and forging scales), this insert utilizes Sumitomo's proprietary AC830P Absotech Technology. By integrating an ultra-tough, highly oriented $\alpha$-$\text{Al}_2\text{O}_3$ (Alumina) and TiCN crystal coating layer, it achieves extraordinary resistance to micro-chipping, thermal cracking, and sudden impact failure. The specialized -SU Type Chipbreaker features a sharp, highly positive rake face geometry meticulously engineered to lower cutting forces, eliminate chatter in slender workpieces, and ensure exceptional chip-breaking predictability across a wide array of feed rates.
2. Product Key Features
- Absotech CVD Crystal Coating Shield: Features a smooth, stress-released outer coating layer that drastically reduces built-up edge (BUE) formation, flank wear, and adhesion when machining gummy steels.
- Superb Edge Toughness Substrate: Engineered with a specialized gradient carbide substrate that retains high impact resistance, making it highly reliable for light-to-medium interrupted cuts.
- Low Cutting Resistance -SU Geometry: The positive inclination angle minimizes structural vibration and deflection, which makes it ideal for internal boring or turning thin-walled components.
- Double-Sided Cost Efficiency: Built with 4 distinct, highly precise cutting edges per insert, delivering lower cost-per-edge metrics while maintaining absolute 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 | VNMG160408N-SU | VNMG 332-SU (VNMG332) |
| 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 ($r_{\epsilon}$) | 0.8 mm | 0.0315 in (2/64") |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed ($v_c$) | Feed Rate per Revolution ($f$) / Depth ($a_p$) |
|---|---|---|
| Mild, Carbon, & Structural Steels (SS400 / AISI 1045) | 140 - 280 m/min (460 - 920 SFM) | 0.12 - 0.35 mm/rev (0.005 - 0.014 ipr) ap: 0.5 - 3.0 mm (0.020 - 0.118 in) |
| Alloy & Pre-Hardened Steels (AISI 4140 / SCM440) | 110 - 220 m/min (360 - 720 SFM) | 0.10 - 0.30 mm/rev (0.004 - 0.012 ipr) ap: 0.4 - 2.5 mm (0.016 - 0.098 in) |
This VNMG160408 turning matrix requires standard external or internal profiling toolholders engineered with negative 35-degree pocket seats.
Browse Matching MVJNR / MVQNR / MVUNR Toolholders →4. Product Application Scenarios
The AC830P 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 | AC830P (Target) | ISO P20 - P40 / Finishing to Medium Steel Interrupted Turning | Absotech thick Al2O3-TiCN Premium High-Toughness CVD Layer |
| Sandvik Coromant | GC4335 / GC4435 | ISO P35 - P40 / Medium Turning & Light Interruption | Inveio® Alumina Crystal Coating System |
| Kennametal | KCP30B / KCP40B | ISO P30 - P45 / High Toughness Structural Steel Turning | Multi-phase CVD Al2O3 Wear Shielding over tough core |
| Iscar | IC8350 / IC8250 | ISO P25 - P40 Finishing to Medium Shock Cutting | SUMO TEC high-adhesion CVD coating 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:
"Switched to the VNMG 332-SU AC830P for copy turning 4140 pre-hardened shafts. The -SU breaker completely cured our vibration issues on the slender sections, and the chips break beautiful even at lighter depths of cut. Tool life went up by 40%."
"Sehr stabiler Schnitt bei leicht unterbrochener Bearbeitung. Die Absotech-Beschichtung zeigt extrem geringen Freiflächenverschleiß. Perfekte Oberflächengüte bei der Schlichtbearbeitung von Kohlenstoffstahl."
"Il rompitruciolo -SU riduce notevolmente gli sforzi di taglio. Molto consigliato per la finitura di pezzi lunghi dove il rischio di vibrazione è elevato. Ottima resistenza meccanica complessiva."
"細物シャフトの倣い加工で長年悩まされていたビビリが、この-SUブレーカで一発で解消しました。AC830Pの刃先靭性が非常に高く、キー溝を跨ぐ連続切削でもチップの突然死が全くありません。"
8. Technical Machining FAQ
Q: What is the primary difference between the Sumitomo -SU chipbreaker and the -GU chipbreaker?
A: The -SU chipbreaker is designed with a sharper, more positive cutting edge profile engineered explicitly for finishing to light-medium turning operations, minimizing cutting forces and chatter. The -GU chipbreaker features a stronger, slightly more robust edge land optimized for broader, medium-to-rough profiling cycles.
Q: Can the VNMG160408N-SU handle heavy roughing cuts?
A: No, it is not recommended. The -SU geometry is specifically tuned for a depth of cut (DOC) up to 3.0mm. Exceeding this limits chip-breaking efficiency and may cause rapid tool wear due to severe chip overloading on the sharp positive edge land.
Q: Why is the AC830P grade ideal for steel applications with light interruptions?
A: The AC830P grade incorporates an advanced crystal-aligned CVD coating over an incredibly ductile carbide substrate with high binder-phase optimization. This specific design limits crack propagation from light shocks, preventing sudden catastrophic tip failure.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Main application range covers ISO P20 to P40 specifications. Uniquely engineered for high carbon steels (S45C/S50C), alloy structural steels (4140, 4340, SCM440 structures), and tough steel moldings prone to mechanical stress.
Machining Troubleshooting Guide: If rapid flank wear occurs when executing high-velocity finishing passes, decrease the cutting speed ($v_c$) or audit the coolant delivery. If unexpected edge chipping occurs on the structural nose radius ($0.8\text{mm}$ tip), reduce the feed rate per revolution ($f$) or check for excessive machine tool spindle runout.
Authorized Reference Documentation & Endorsements: Naming codes, clearance specifications, and geometrical tolerances strictly comply with international industrial tooling standards. Mechanical structural properties and tool wear wear thresholds are fully verified based on official 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.