SUMITOMO VNMG160408N-SU AC630M Stainless Steel Turning Insert (VNMG 160408 / VNMG 332 Equivalent)
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SUMITOMO VNMG160408N-SU AC630M Absotech PVD Carbide Stainless Steel Turning Insert
1. Product Overview
"Which indexable turning insert grade and chipbreaker profile eliminate work hardening, prevent notch wear, and provide the longest tool life when finishing or medium profiling austenitic stainless steel like 304 or 316?"
The SUMITOMO VNMG160408N-SU AC630M is a premium, 35° rhombic negative double-sided indexable turning insert engineered to solve the unique thermal and mechanical challenges of machining stainless steels. Optimized for the ISO M10–M30 material range (including austenitic 304/316, duplex alloys, and precipitation-hardening steels like 17-4 PH), this insert features Sumitomo’s advanced AC630M Absotech Technology coating. By utilizing a newly developed, highly engineered ultra-thin TiAlN PVD coating layer with excellent heat shielding properties, it suppresses boundary notch wear and adhesion when cutting gummy materials. Paired with the sharp, low-force -SU Type Chipbreaker, it lowers cutting resistance to eliminate vibration and chatter on slender workpieces while delivering outstanding chip control and excellent surface finishes.
2. Product Key Features
- Absotech PVD High-Thermal Shield: Advanced structural TiAlN PVD coating offers unmatched oxidation resistance, directly combating severe boundary notch wear common in stainless machining.
- Tough Gradient Carbide Substrate: Blends a sharp cutting edge with a highly ductile tungsten carbide core to survive light interruptions and unstable setups.
- Sharp Positive -SU Geometry: A highly positive rake profile cuts smoothly through work-hardening layers, reducing mechanical load and preventing workpiece deformation.
- Four Precise Indexable Edges: The negative double-sided configuration maximizes cost efficiency per corner while maintaining high pocket seating stability.
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 ($a_p$) |
|---|---|---|
| Austenitic Stainless Steel (SUS304 / SUS316 / AISI 316L) | 90 - 180 m/min (295 - 590 SFM) | 0.10 - 0.30 mm/rev (0.004 - 0.012 ipr) ap: 0.5 - 3.0 mm (0.020 - 0.118 in) |
| Duplex & Hardened Stainless Steels (2205 / 17-4 PH) | 60 - 130 m/min (195 - 425 SFM) | 0.08 - 0.25 mm/rev (0.003 - 0.010 ipr) ap: 0.4 - 2.5 mm (0.016 - 0.098 in) |
This standard negative 35° profile insert requires matching external lathe holders or internal boring bars with rigid pocket seat locking configurations.
Browse Matching MVJNR / MVUNR / MVQNR Lathe Toolholders →4. Product Application Scenarios
The AC630M high-reliability PVD grade performs exceptionally well across tough stainless steel components:
5. Toolholder & Equipment Compatibility
Compliant with precise indexable international parameters, this tooling insert fits into global CNC turning blocks:
- Turning Toolholder Assemblies: Drops directly into standard external MVJNR, MVJNL, MVUNR, MVQNR shanks, or internal boring bars built for the VNMG 1604 / VNMG 33 size envelop.
- CNC Machinery Integration: Optimized for high-rigidity CNC lathes, turn-mill centers, and Swiss-type multi-axis centers (Mazak, DMG Mori, Okuma, Haas, Citizen) running stable wet cycles.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Technology |
|---|---|---|---|
| SUMITOMO | AC630M (Target) | ISO M10 - M30 / Stainless Steel Profile Turning | Absotech TiAlN Thin Matrix Premium PVD Technology |
| Sandvik Coromant | GC2025 / GC2220 | ISO M15 - M30 / Finishing to Medium Stainless Turning | Thin PVD TiAlN / Inveio® structural variant coating |
| Kennametal | KCM25B / KCU10 | ISO M20 - M30 / Tough Austenitic & Duplex Milling/Turning | Advanced multilayer PVD wear barrier coating |
| Iscar | IC6025 / IC806 | ISO M20 - M35 Anti-Adhesion Stainless Machining | High-smoothness SUMO TEC PVD layer structure |
7. Why Choose Us & Verified Global Performance Evaluations
Real feedback from international machine shops running demanding stainless steel production lines:
"We rough and finish long 316 stainless pump rods on our Haas ST-30. Other inserts kept losing their nose radius due to built-up edge and notch wear. The VNMG 332-SU in AC630M cuts cleanly, drops our torque load by 20%, and holds tolerances across large batches."
"Hervorragende Spankontrolle beim Drehen von V4A-Edelstahl. Der -SU-Spanleitstufe bricht die Späne perfekt in kleine Locken, sodass keine langen Späne mehr das Werkstück zerkratzen. Die AC630M Standzeit ist erstklassig."
"Inserto molto affilato ideale per eliminare l'incrudimento superficiale sui particolari in acciaio inox. Finitura superficiale eccellente. Molto stabile anche su passate leggere."
"SUS304のコピー加工で使用。以前は他社製CVDチップで境界摩耗に悩まされていましたが、このAC630M（PVD）に変えてから境界剥離が劇的に改善しました。-SUの切れ味が良くビビリも出ません。"
8. Technical Machining FAQ
Q: Why choose the AC630M PVD grade over a standard CVD grade for turning stainless steel?
A: While CVD coatings are thicker and superior for raw heat resistance in dry steel roughing, they tend to have micro-rounded edges that can burnish and work-harden gummy stainless steel. The AC630M PVD grade features a much thinner, high-adhesion coating that maintains a sharp edge profile, preventing boundary notch wear and built-up edge formation.
Q: Does the -SU chipbreaker manage high-depth roughing cuts efficiently?
A: No. The -SU geometry is specifically engineered for finishing to medium profiling applications, with a maximum depth of cut (DOC) up to 3.0mm. Attempting heavier roughing passes can overload the positive edge profile and lead to rapid tool wear.
Q: Should I run this stainless steel insert dry or wet?
A: For stainless steel applications, running with high-pressure, flood coolant is highly recommended. Coolant helps lubricate the cutting zone to minimize built-up edge (BUE) formation and flushes chips away to prevent recutting.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Main application focus covers ISO M10 to M30 parameters. Specifically tuned for austenitic stainless steels (304, 304L, 316, 316L), ferritic/martensitic alloys (410, 430), and high-strength duplex alloys (2205 structures) prone to rapid notch wear.
Machining Troubleshooting Guide: If sudden chipping occurs at the boundary line, slightly decrease the depth of cut ($a_p$) or adopt a variable depth cycle to shift the contact point. If work-hardening causes downstream finish failure, ensure your feed rate ($f$) remains above the $0.10\text{mm/rev}$ threshold to prevent the insert from rubbing in its own cut.
Authorized Reference Documentation & Endorsements: Structural classifications, pocket tolerances, and tooling naming standards follow strict international ISO/ANSI frameworks. Performance limits and mechanical parameters are cross-referenced with empirical field testing data published by Sumitomo Electric Hardmetal Corp.
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.