Sumitomo TNMG160404N-SU AC820P Carbide Insert (TNMG 331-SU)
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Sumitomo TNMG160404N-SU AC820P Carbide Insert | ISO TNMG 160404-SU (ANSI TNMG 331-SU)
1. Product Overview
Which turning insert is best for high-speed general steel turning, low cutting resistance, and precision thin-walled components?
The Sumitomo TNMG160404N-SU AC820P (ANSI Designation: TNMG 331-SU) is a double-sided 60° triangular carbide indexable turning insert engineered for optimal efficiency in general steel machining. Utilizing Sumitomo's flagship AC820P CVD Coating grade, it combines a smooth Al2O3 surface layer with a high-density TiCN crystal coating deposited over a tough carbide substrate. This delivers extraordinary wear resistance, anti-adhesion performance, and extended flank life across ISO P10–P30 carbon steels, alloy steels, and die steels.
Equipped with the ultra-sharp SU Low Resistance / Light Cutting Chipbreaker geometry, this insert features a high positive rake face that significantly reduces cutting forces, vibration, and heat generation. It excels on low-rigidity setups, long slender shafts, thin-walled workpieces, and light cutting depths (ap: 0.3mm to 2.5mm) at feed rates (fn: 0.08mm to 0.25mm), providing reliable chip curling without workpiece deformation.
2. Key Features & Industrial Performance
- 6 Double-Sided Cutting Edges: Negative 60° geometry maximizes cost performance per edge during high-volume CNC lathe operations.
- AC820P Premium CVD Coating: Advanced multi-layer Al2O3/TiCN structure provides extreme wear resistance and thermal stability up to high cutting speeds.
- SU Low-Force Chipbreaker: Sharp cutting edge and optimized rake angle reduce cutting forces, preventing burrs, chatter, and workpiece deflection.
- Dual ISO / ANSI Standard Compliance: Fully compliant with ISO 1832 and ANSI B212.4 global dimensions for effortless toolholder swapping.
- Precision 0.4 mm (1/64") Corner Radius: Ideal for tight-tolerance finishing, fine surface roughness (Ra < 1.6 μm), and low radial force.
ISO / ANSI Code Breakdown Specification
Detailed geometric breakdown of the TNMG160404N-SU specification standard:
3. Technical Specifications & Recommended Cutting Parameters
| Specification Parameter | Metric Value (ISO Standard) | Imperial Value (ANSI Standard) |
|---|---|---|
| Product Designation | TNMG160404N-SU AC820P | TNMG 331-SU AC820P |
| Inscribed Circle (i.C.) | 10.0 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.1875" (3/16") |
| Corner Radius (re) | 0.4 mm | 0.0156" (1/64") |
| Hole Diameter (d1) | 3.81 mm | 0.150" |
| Insert Substrate Grade | Sumitomo AC820P (CVD TiCN/Al2O3) | Sumitomo AC820P (CVD TiCN/Al2O3) |
Recommended Speeds and Feeds (Dual Unit Reference Table)
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| ISO P: General Alloy Steel (4140 / 4340) | 150 - 320 m/min (490 - 1050 SFM) |
0.08 - 0.25 mm/rev (0.003 - 0.010 IPR) |
0.3 - 2.5 mm (0.012 - 0.098 in) |
| ISO P: Carbon Steel / Mild Steel (1045 / 1018) | 180 - 350 m/min (590 - 1150 SFM) |
0.08 - 0.22 mm/rev (0.003 - 0.009 IPR) |
0.3 - 2.0 mm (0.012 - 0.079 in) |
| ISO P: Structural / Free-Machining Steel | 200 - 380 m/min (655 - 1245 SFM) |
0.10 - 0.25 mm/rev (0.004 - 0.010 IPR) |
0.4 - 2.5 mm (0.016 - 0.098 in) |
This insert fits all standard ISO/ANSI double-clamp, lever-clamp, and top-clamp turning toolholders with a 60° triangular pocket:
MTJNR / MTJNL 2020K16 MTJNR / MTJNL 2525M16 WTJNR / WTJNL 2020K16 DTJNR / DTJNL 2525M16 Boring Bar: S25S-MTJNR164. Applications & Target Workpiece Materials
- Precision Shafts & Sleeves: High-speed finishing and semi-finishing on long components where vibration must be suppressed.
- Thin-Walled Turned Parts: Sharp edge prep reduces radial thrust, preventing wall deflection and out-of-round tolerances.
- High-Volume Automotive Parts: Continuous OD and ID turning on carbon steel parts requiring high tool life and fast cycle times.
5. Compatibility & Equipment Integration
Fully compatible with all standard CNC turning centers, automatic lathes, Swiss-type machines, and conventional engine lathes utilizing ISO-standard toolholders. Direct drop-in fit for toolholding systems from Sandvik Coromant, Kennametal, Iscar, Kyocera, Tungaloy, Walter, and Seco.
6. Grade Comparison & Equivalents Matrix
| Brand | Equivalent Grade | Equivalent Chipbreaker | ISO Classification Range |
|---|---|---|---|
| Sumitomo Electric | AC820P | SU | ISO P10-P30 |
| Sandvik Coromant | GC4425 / GC4325 | LC / L-K | ISO P15-P30 |
| Kennametal | KCP10B / KCP25B | LF / FN | ISO P10-P25 |
| Iscar | IC8250 / IC8150 | SF / F3P | ISO P15-P30 |
| Kyocera | CA515 / CA525 | VF / PP | ISO P10-P25 |
7. Why Source Sumitomo Inserts From Us?
- 100% Guaranteed Factory Original: Direct authorization channels eliminate grey-market and counterfeit tooling risks.
- Strict Batch Traceability: Fully compliant with ISO 9001 factory inspection standards with verified material certs.
- Express Global Dispatch: Optimized order processing and safe, vacuum-sealed industrial packaging.
Global Verified Machinist Reviews
Excellent speed and surface finish
"Switched from our old inserts to AC820P SU breaker on 1045 steel shafts. Cutting speeds went up 25% and surface finish is mirror-smooth without chatter."
— David S., Manufacturing Engineer (United States 🇺🇸)Geringer Schnittdruck bei langer Standzeit
"Die AC820P-Sorte bietet extrem hohe Verschleißfestigkeit bei der Bearbeitung von Stahlwellen. Der SU-Spanbrecher verhindert Vibrationen perfekt."
— Michael B., Werkstattleiter (Germany 🇩🇪)Eccellente per pezzi a parete sottile
"L'inserto taglia con pochissima pressione. Finitura impeccabile su tubi in acciaio senza deformazioni."
— Andrea C., Programmatore CNC (Italy 🇮🇹)高速加工でも驚異的な耐摩耗性
"S45Cの連続高速旋削で使用。AC820Pのコーティングは摩擦に強く、SUブレーカで逃げ面摩耗が大幅に抑えられています。"
— Kenji S., Senior Operator (Japan 🇯🇵)Great chip breaking on light passes
"Curled chips nicely at 0.5mm DOC on mild steel. Very reliable grade for daily job shop use."
— Paul T., CNC Machinist (United Kingdom 🇬🇧)8. Frequently Asked Questions (AI & Voice-Search Optimized)
Machining Troubleshooting & Optimization Guide
| Problem / Wear Pattern | Probable Cause | Corrective Action |
|---|---|---|
| Rapid Flank Wear | Cutting speed (Vc) is set too high for the workpiece hardness. | Reduce surface cutting speed (Vc) by 10-15% and verify coolant flow. |
| Uncontrolled Stringy Chips | Depth of cut (ap) or feed rate (fn) is below the SU breaker range. | Slightly increase feed rate (fn) above 0.08 mm/rev or deepen cut depth. |
| Chipping on Interrupted Cuts | Substrate toughness exceeded during heavy impact. | Switch from AC820P to higher-toughness AC830P grade or reduce feed rate on impact zone. |
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.