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.
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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.