SUMITOMO VNMG160404N-UP AC830P Steel Turning Insert (VNMG 160404 / VNMG 331 Equivalent)
Free shipping on all orders.
Check compatibility: Confirm the model and dimensions before ordering.
Need help choosing? Contact us before ordering.
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
SUMITOMO VNMG160404N-UP AC830P Absotech CVD Carbide Steel Turning Insert
1. Product Overview
"Which indexable negative turning insert provides the absolute best combination of high crater wear resistance, reliable chip breaking, and edge toughness during medium-to-finish profiling of highly abrasive carbon and alloy steels?"
The SUMITOMO VNMG160404N-UP AC830P is a high-performance, double-sided 35-degree rhombic negative carbide turning insert engineered specifically for aggressive profile turning and copy-machining. Optimized heavily for the ISO P20 to P35 steel spectrum (including AISI 1045, 4140, 4340, and SCM440 alloy steels), this insert leverages Sumitomo's pioneering AC830P Absotech CVD Coating Technology. By deploying an ultra-thick, highly oriented α-Al2O3 (alpha-alumina) and TiCN crystal coating matrix over a deformation-resistant substrate, it achieves peerless structural integrity under severe plastic deformation and high-temperature cutting zones. The innovative -UP Type Chipbreaker is mathematically engineered with a multi-stage positive variable rake angle. This geometry lowers cutting friction and power consumption while ensuring forced, tight chip breaking across broad depth-of-cut thresholds, successfully overcoming long stringy nesting during critical profiling.
2. Product Key Features
- Absotech Premium CVD Coating Matrix: Thick-film alpha-alumina layering provides a superior thermal barrier, completely halting crater wear development during long, uninterrupted production runs.
- High-Density Gradient Substrate: Engineered core with high plastic deformation resistance protects the 35° sharp nose tip against catastrophic thermal collapse and plastic deformation.
- Advanced -UP Chipbreaker Topography: Variable-step geometry delivers excellent chip control in both forward profiling and reverse out-copying operations across wide feed ranges.
- Double-Sided 4 Cutting Edges: Highly economical 4-edge execution maximizes tool-life-per-insert metrics and drops overall manufacturing overhead.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Industrial Nomenclature Decoding Matrix
| Dimension Parameter | Metric Specification (ISO) | Imperial Equivalent Benchmark (ANSI) |
|---|---|---|
| Product Designation Model | VNMG160404N-UP | VNMG 331-UP (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) |
|---|---|---|
| Medium Carbon Steel (AISI 1045 / C45) | 180 - 350 m/min (590 - 1150 SFM) | 0.10 - 0.35 mm/rev (0.004 - 0.014 ipr) ap: 0.5 - 2.5 mm (0.020 - 0.098 in) |
| Alloy Steel / Die Steel (AISI 4140 / 4340 / SCM440) | 140 - 280 m/min (460 - 920 SFM) | 0.08 - 0.30 mm/rev (0.003 - 0.012 ipr) ap: 0.4 - 2.0 mm (0.016 - 0.079 in) |
This VNMG 1604 / VNMG 33 negative configuration requires rigid multi-directional clamping seats to handle heavy lateral loads during deep copy profiling.
Browse Matching MVJNR / MVQNR / MVUNR External & Internal Boring Toolholders →4. Product Application Scenarios
The AC830P high-hardness coating excels in high-efficiency, multi-axis machining applications:
5. Toolholder & Equipment Compatibility
Manufactured to strict global standardizations, this insert is fully interchangeable with global machine setups:
- Turning Toolholders: Seamlessly drops into any standard negative 35° pocket toolholder assemblies utilizing high-stability clamp mechanisms (e.g., MVJNR2020K16, MVJNR2525M16, Pin-and-Clamp configurations).
- CNC Systems: Engineered specifically for medium-to-large high-torque CNC lathes, turning centers, and horizontal production platforms (Haas, Mazak, Doosan, Okuma, Mori Seiki).
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Technology |
|---|---|---|---|
| SUMITOMO | AC830P (Target) | ISO P20 - P35 / Heavy-Duty, Shock-Resistant Steel Profiling Matrix | Absotech Thick α-Al2O3 Crystal Oriented CVD Coating |
| Sandvik Coromant | GC4335 / GC4435 | ISO P35 / Structural Steel Turning under Interrupted Cut Loads | Inveio highly oriented alumina coating layer |
| Kennametal | KCP30B / KC9130 | ISO P25 - P40 / Heavy Roughing & Medium Cut Interrupted Steel | KMT multilayer CVD coating with enhanced flank wear control |
| Iscar | IC830 / IC8250 | ISO P20 - P40 Highly Interrupted Copy Turning Conditions | ALPHA-TEC CVD coating featuring high impact toughness parameters |
7. Why Choose Us & Verified Global Performance Evaluations
Proven feedback from high-volume manufacturing facilities regarding process optimization:
"We use these VNMG 331-UP inserts for copy turning pre-forged 4140 drive shafts. Previously, we struggled with micro-chipping on the 35-degree nose during the scale-breaking pass. The AC830P grade completely resolved our chipping issues, doubling our parts-per-edge count."
"Hervorragende Kolkverschleißfestigkeit bei der Bearbeitung von C45-Stahl. Der -UP Spanleiter bricht die Späne auch bei variierenden Schnitttiefen absolut zuverlässig. Sehr stabile Standzeiten im automatisierten Drehprozess."
"Ottimo controllo del truciolo nella tornitura di profili complessi su alberi motore. La stabilità dell'inserto VNMG in fase di copiatura è impressionante, riducendo le vibrazioni sulle pareti sottili."
"SCM440の調質材フライス皮むき後の倣い旋削加工で使用。他社の厚膜CVDだと境界摩耗から突発欠損が起きていましたが、AC830Pの吸着性と結晶配向技術のおかげで、刃先が非常に安定して摩耗が進行します。無人化運転に欠かせないチップです。"
8. Technical Machining FAQ
Q: Why should I run the AC830P CVD grade instead of a PVD coated insert for profiling steel?
A: Heavy-duty copy turning of steel generates immense crater-wear friction and high heat zones on the 35° nose tip. The AC830P CVD grade features an ultra-thick, heat-resistant Al2O3 layer that acts as a thermal shield, allowing you to run much higher cutting speeds (Vc) without causing plastic deformation, outperforming PVD equivalents in continuous cutting cycles.
Q: I am experiencing chip packing and wrapping when executing back-copying (pull-turning). How do I correct this?
A: Back-copying alters the effective chip-flow angle relative to the chipbreaker's deflector walls. The -UP chipbreaker is designed to adapt to multi-directional flow, but if wrapping persists, ensure your feed rate (f) is matched above 0.15 mm/rev to hit the secondary redirection groove, or verify that high-pressure coolant is hitting the trailing edge directly.
Q: Is the VNMG160404N-UP insert appropriate for machining soft low-carbon steels like AISI 1018?
A: While it will execute the cut safely, highly gummy low-carbon steels (like 1018 or A36) often generate long, unmanageable chips under low depths of cut. For optimal chip management in very gummy materials, we recommend switching to the sharper -UX chipbreaker variant or using a specialized light-finishing PVD line.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Fine-tuned for the ISO P20 to P45 carbon steel, low-alloy steel, and high-tensile tool steel spectrum. Demonstrates exceptional structural predictability across heavy forging crusts, interrupted structural welding joints, and heat-treated raw stock blanks.
Machining Troubleshooting Guide: If sudden flank chipping occurs along the secondary flank under interrupted cut loads, lower the feed rate by 15% or increase your cutting speed to maintain ideal cutting zone energy. If rapid crater wear forms directly behind the cutting lip, confirm that your delivery volume of high-pressure emulsion coolant is adequate, or upgrade to the harder AC820P grade.
Authorized Reference Documentation & Endorsements: All physical configurations, dimensional parameters, and engineering nomenclature strictly match established international ISO 1832:2017 and ANSI B212.4 machining standards. Real-world performance curves and operational envelopes are validated utilizing certified materials processing datasets provided by Sumitomo Electric Hardmetal Corporation.
Need Help With Sumitomo Inserts?
Looking for a Sumitomo equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
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.