SUMITOMO VNMG160404N-GU AC630M Stainless Steel Turning Insert (VNMG 160404 / VNMG 331 Equivalent)
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SUMITOMO VNMG160404N-GU AC630M Absotech Carbide Stainless Steel Turning Insert
1. Product Overview
"Which indexable carbide turning insert provides the absolute best combination of edge sharpness, medium chip control, and adhesion resistance when profiling gummy austenitic stainless steels or hard duplex alloys?"
The SUMITOMO VNMG160404N-GU AC630M is a premium, 35-degree rhombic negative double-sided carbide turning insert engineered precisely to conquer severe work-hardening and built-up edge (BUE) tendencies in demanding stainless steel machining. Optimized for the ISO M10 to M30 spectrum (including AISI 304, 316, duplex 2205, and precipitation-hardening superalloys), this insert features Sumitomo's breakthrough AC630M Absotech Coating Technology. By deploying an ultra-smooth, high-adhesion PVD/CVD structural coating matrix, it maximizes resistance to peeling and boundary notch wear. The high-performance -GU Type Chipbreaker features a multi-stage rake face geometry, engineered explicitly for general-purpose medium turning to finish applications to break tough, stringy stainless chips cleanly at balanced feed rates.
2. Product Key Features
- Absotech Advanced Coating Matrix: Premium structural layer provides exceptional boundary wear resistance and superior thermal protection during dry or wet machining cycles.
- Tough, High-Density Carbide Substrate: Superior core integrity protects against micro-chipping and sudden fracture during interrupted cuts and heavy thermal cycling.
- Optimized -GU Medium Turning Geometry: Highly versatile multi-stage rake angle that controls cutting forces while ensuring optimal chip breaking across a wide depth-of-cut range.
- Double-Sided 4-Corner Economics: Maximizes machining profitability with 4 indexable cutting edges ground to strict ISO standards for repeatable accuracy.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Industrial Nomenclature Decoding Matrix
| Dimension Parameter | Metric Specification (ISO) | Imperial Equivalent Benchmark (ANSI) |
|---|---|---|
| Product Designation Model | VNMG160404N-GU | VNMG 331-GU (VNMG331) |
| 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) | 0.4 mm | 0.0157 in (1/64") |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed (Vc) | Feed Rate (f) / Depth of Cut (ap) |
|---|---|---|
| Austenitic Stainless Steel (AISI 304 / 316) | 140 - 240 m/min (460 - 785 SFM) | 0.10 - 0.30 mm/rev (0.004 - 0.012 ipr) ap: 0.5 - 2.5 mm (0.020 - 0.098 in) |
| Duplex & Super Duplex Stainless (Alloy 2205 / 2507) | 80 - 160 m/min (260 - 525 SFM) | 0.08 - 0.25 mm/rev (0.003 - 0.010 ipr) ap: 0.4 - 2.0 mm (0.016 - 0.079 in) |
This VNMG 1604 / VNMG 33 negative configuration requires precise pocket alignment to leverage the ultra-smooth edge geometry.
Browse Matching MVJNR / MVQNR / MVUNR External Toolholders →4. Product Application Scenarios
The AC630M high-toughness core delivers high predictability across highly abrasive production workflows:
5. Toolholder & Equipment Compatibility
Machined to universal standardization tolerances, this insert retrofits seamlessly onto global tooling systems:
- Turning Holders: Fully compatible with standard negative 35-degree external shanks (MVJNR/L, MVUNR/L, MVQNR/L) and rugged boring bars built for VNMG1604 / VNMG331 pockets.
- CNC Equipment: Engineered for high-rigidity CNC turning centers and multi-axis automated platforms (Mazak, Okuma, DMG Mori, Haas, Doosan) running precise multi-pass alloy paths.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Technology |
|---|---|---|---|
| SUMITOMO | AC630M (Target) | ISO M10 - M30 / Tough Stainless Steel Medium Profiling Matrix | Absotech Superior Toughness Anti-Peeling PVD/CVD |
| Sandvik Coromant | GC2220 | ISO M20 - M25 / Stable to Interrupted Stainless Steel Machining | Inveio Highly Oriented Crystalline Coating |
| Kennametal | KCM25A / KC9225 | ISO M15 - M30 / Universal High-Performance Stainless Turning | Advanced multilayer matrix optimized for high wear resistance |
| Iscar | IC6015 / IC6025 | ISO M15 - M30 Medium Alloy Profiling | SUMO TEC surface processing for minimized chip welding friction |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world feedback from global job shops focusing on precision alloy material removal:
"We run these VNMG 331-GU inserts on our Haas ST-20Y for finishing 316L medical flanges. The 0.015" corner radius matches up perfectly with our strict fillet specifications, and the surface finish comes out like glass without any early thermal cracking."
"Hervorragende Spankontrolle bei Edelstahl 1.4301. Der -GU Spanbrecher funktioniert tadellos in einem breiten Spektrum. Die Absotech PVD-Schicht verhindert Aufbauschneidenbildung extrem zuverlässig, was die Standzeit im Vergleich zur Konkurrenz verdoppelt hat."
"Ottimo inserto per finitura e media lavorazione su Duplex. Il raggio 0.4 riduce drasticamente le vibrazioni sui pezzi lunghi e sottili."
"SUS304の精密倣い加工で長年愛用しています。R0.4特有の切れ味の良さと-GUブレーカの絶妙な巻き込み形状により、細長いワークでもびびりが発生しません。AC630Mの耐摩耗性は圧倒的で、寸法精度が非常に安定します。"
8. Technical Machining FAQ
Q: What makes the -GU chipbreaker ideal for stainless steel operations over standard universal chipbreakers?
A: The -GU profile is specifically engineered with an aggressive, multi-stage positive rake angle that shears gummy materials rather than pushing them. This structure lowers overall tool pressure, cuts down thermal buildup at the cutting edge, and curls stringy stainless chips into small, manageable segments to keep your machine enclosure clear.
Q: I am experiencing slight micro-chipping on the corner during light interrupted cuts. How do I adjust parameters?
A: Since the 0.4mm corner radius provides high sharpness, severe micro-interruptions can stress the edge. Try dropping the feed rate slightly right before the interruption or consider stepping up to the 0.8mm radius variant (VNMG160408N-GU) if your part footprint allows it.
Q: Is the AC630M grade suited for high-temperature superalloys like Inconel or Titanium?
A: Yes. The advanced Absotech coating formulation possesses high chemical stability and exceptional resistance to notch wear, making it an excellent fallback option for roughing or medium finishing nickel-based superalloys and titanium components.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Optimized explicitly for the ISO M10 to M30 alloy spectrum. Demonstrates reliable performance trends across common premium austenitic families (AISI 304, 316), heavy martensitic configurations, and challenging duplex setups (Alloy 2205) susceptible to high structural deflection.
Machining Troubleshooting Guide: If high built-up edge (BUE) or chemical chip welding occurs, increase your cutting velocity (Vc) to step past the alloy's adhesion threshold. If high thermal deformation or plastic collapse is observed at the nose tip, lower your surface speed or switch to a harder CVD matrix grade like AC6030M.
Authorized Reference Documentation & Endorsements: Dimensional configurations, tolerance boundaries, and geometric nomenclature conform entirely with established global ISO/ANSI standards. Structural capabilities and operating limitations are cross-verified with official industrial processing guides published by Sumitomo Electric Hardmetal Corporation.
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.