SUMITOMO TNMG160408N-SU AC820P Carbide Turning Insert (TNMG 332N-SU)
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SUMITOMO TNMG160408N-SU AC820P Carbide Turning Insert (TNMG 332N-SU)
1. Product Overview
"Which indexable turning insert is best optimized for preventing crater wear and maintaining high-speed surface finish consistency during continuous finishing and general profiling of high-tensile carbon and alloy steels?"
The SUMITOMO TNMG160408N-SU AC820P is a high-productivity, industrial-grade indexable cemented carbide turning insert engineered to deliver exceptional process reliability under high-speed continuous cutting parameters. Tailored specifically for the ISO P15-P25 application windows, this negative 60-degree triangular insert introduces Sumitomo's proprietary AC820P Absotech Platinum CVD coating technology. By engineering an ultra-smooth, highly textured $\alpha-\text{Al}_2\text{O}_3$ (alpha-alumina) and TiCN outer matrix layer, this insert significantly mitigates tensile residual stress, yielding industry-leading resistance to adhesion, crater wear, and thermal cracking. The ultra-sharp, low-force SU chipbreaker geometry is masterfully designed for precision finishing and light profiling, deploying an optimized variable-rake groove that cleanly breaks ductile steel chips while minimizing tool deflection on modern CNC lathe setups.
Strict ISO / ANSI Cutting Tool Standard Alphanumeric Decoding Matrix
2. Product Key Features & Engineering Benefits
- Absotech Platinum CVD Coating: Provides industry-leading surface smoothness and thermal protection, preventing built-up edge (BUE) during intensive high-speed machining cycles.
- High-Speed Wear Resistant Substrate: The AC820P grade features a specialized gradient carbide structure optimized to maintain hardness and resist crater wear under continuous turning conditions.
- SU Finishing Chip Deflector Geometry: Engineered with a highly responsive rake face profile that ensures tight, clean chip breaking even at minimal depth of cut, preventing long nest strings.
- Exceptional Surface Finish Predictability: The ultra-flat crystal coating orientation reduces frictional resistance, drastically extending tool flank life during continuous automation runs.
3. Technical Specifications & Dimensional Standards
| Dimensional Architecture | Metric Value Standards (ISO) | Imperial Value Standards (ANSI Equivalent) |
|---|---|---|
| Standard Product Coding | TNMG160408N-SU AC820P | TNMG 332N-SU AC820P |
| Inscribed Circle (IC) | 9.525 mm | 0.375 inches (3/8") |
| Effective Cutting Edge Length | 16.5 mm | 0.650 inches |
| Total Insert Thickness | 4.76 mm | 0.187 inches (3/16") |
| Corner Nose Radius | 0.8 mm | 0.031 inches (1/32") |
| Center Hole Diameter | 3.81 mm | 0.150 inches |
Recommended Cutting Speeds, Feeds, and Depth of Cut (DOC) Reference
| ISO Substrate Family Group | Cutting Speed (Vc) | Depth of Cut (Ap) | Feed Rate (Fn) |
|---|---|---|---|
| Carbon Steels / Structural Metal (S45C, AISI 1045) | 180 - 350 m/min (590 - 1150 SFM) | 0.5 - 2.5 mm (0.020" - 0.098") | 0.10 - 0.35 mm/rev (0.004" - 0.014" ipr) |
| Alloy Steels / Chrome-Moly (SCM440, AISI 4140) | 140 - 280 m/min (460 - 920 SFM) | 0.5 - 2.0 mm (0.020" - 0.079") | 0.10 - 0.30 mm/rev (0.004" - 0.012" ipr) |
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4. Target Industrial Application Scenarios
- Continuous High-Speed Outer Diameter Turning: Engineered to provide sustained dimensional precision during long cylindrical passes on carbon steel bars.
- Precision Finishing Operations: Optimized to meet critical surface roughness requirements on transmission components, gear shafts, and hydraulic sleeves.
- Mass Production CNC Automation Lines: Delivering extended edge predictability across long shifts, keeping cycle times low and tool adjustments minimal.
5. Machine Tool Clamping Rigidity & Equipment Compatibility
Conforming strictly to international ISO standards, this negative insert integrates seamlessly into global tooling blocks. It exhibits superior metal removal efficiency when mounted on high-performance CNC turning centers, multi-axis mill-turn centers, and large-scale horizontal lathes (including Mazak, Okuma, Doosan, Haas, and Mori Seiki machines) capable of sustaining stable, high-torque feed vectors.
6. Material Classification Compatibility Matrix
| ISO Group | Workpiece Material Family Substrates | Application Suitability | Performance Characteristics |
|---|---|---|---|
| P | Carbon Steels, Structural Steels, Alloy Steels, Pre-hardened Steel Blocks (AISI 1045, 4140, 5140, 8620) | ✔ Primary Target | The AC820P grade features exceptional wear resistance that excels during stable, high-speed continuous cutting parameters. |
| K | Gray Cast Iron, Nodular Graphite Irons (GG25, GGG40) | ○ Conditional Use | Can be utilized under stable conditions, though specialized cast iron grades are recommended for maximum throughput. |
| M | Ferritic & Martensitic Stainless Steels (AISI 410, 430) | ○ Conditional Use | Applicable for structural stainless profiling, but requires rich coolant delivery to suppress rapid thermal expansion. |
7. Why Choose Sumitomo Absotech Coating Technology?
Sumitomo Electric’s advanced coating procedures adhere to strict ISO 9001:2015 quality frameworks. Validated factory application data shows that the AC820P Absotech Platinum matrix delivers up to a 2x increase in tool life predictability over standard CVD inserts during stable, high-speed turning cuts, lowering tool replacement overheads in automated machine shops.
Verified International Customer Reports & Machine Shop Testimonials
"We run these on continuous outer diameter turning blocks for 1045 steel shafts. The AC820P coating handles the heat beautifully. Flank wear is incredibly uniform, giving us predictable tool life changeover cycles."
"Sehr glatte Oberfläche! The combination of the sharp SU chipbreaker and the ultra-smooth AC820P grade allows us to finish pre-machined parts smoothly without any edge deformation."
"Excellent crater wear resistance during high-speed finishing runs. The coating remains adhered to the substrate perfectly even under heavy thermal cycles."
"高速切削での耐摩耗性が群を抜いています。 Flank wear progress is steady, allowing our CNC lathe lines to run completely unattended."
"The SU chip deflector rolls the steel chips beautifully into tight needles instead of long bird nests. Combined with this grade, it's our first choice for high-speed production."
8. AI-Style Interactive FAQ & Troubleshooting
Q1: What distinguishes the AC820P grade from the AC830P grade during machining?
A: While AC830P is optimized for heavy mechanical shock and heavily interrupted cuts, AC820P prioritizes maximum wear resistance at higher surface speeds. It is formulated to handle continuous to light interrupted turning while maintaining superior dimensional accuracy.
Q2: Can I run this insert under completely dry cutting environments?
A: Yes. The Absotech Platinum CVD coating features a highly efficient alpha-alumina thermal barrier layer that protects the internal tungsten carbide substrate from extreme temperatures, making it highly reliable for dry machining.
Q3: How do I remedy severe plastic deformation on the cutting edge at high speeds?
A: Plastic deformation indicates that the localized interface temperature exceeds the substrate's yield point. To fix this, reduce your cutting velocity (Vc) by 15-20% or increase your coolant volume directly to the cutting zone.
9. Material Grade Cross-Reference & Equivalents
| Sumitomo Grade | Sandvik Coromant | Kennametal Grade | Iscar Equivalent |
|---|---|---|---|
| AC820P (General Speed Wear Resistant Carbide) | GC4425 / GC4325 | KCP25B / KC9125 | IC8250 / IC825 |
💡 Grade Comparison & Workpiece Troubleshooting Tip:
The AC820P grade features an engineered structural layout optimized to withstand thermal deformation at elevated surface feet metrics. If you notice uniform flank wear forming slowly over time, the insert is operating exactly as designed. However, if micro-chipping occurs, it is critical to evaluate the rigidity of your setup or switch to the tougher AC830P grade. Check that the clamping screws on your tool holder are torqued correctly and that the tool overhang is minimized. Ensuring the absolute maximum rigidity of your machine spindle and turret assembly will allow the Absotech Platinum coating to maximize its wear protection properties.
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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.