Sumitomo TNMG160404N-GU AC820P Carbide Insert (TNMG 331-GU)
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Sumitomo TNMG160404N-GU AC820P Carbide Insert | ISO TNMG 160404-GU (ANSI TNMG 331-GU)
1. Product Overview
Which turning insert is best for general-to-high-speed steel turning, crater wear resistance, and high-efficiency production?
The Sumitomo TNMG160404N-GU AC820P (ANSI Designation: TNMG 331-GU) is a double-sided 60° triangular indexable carbide turning insert engineered for general-purpose to high-speed turning across ISO P05–P25 steel applications. Powered by Sumitomo’s industry-leading AC820P CVD Coating Grade with Absotech® coating technology, it features a smooth Al2O3 / TiCN multi-layer structure applied over a tough carbide substrate. This engineered surface dramatically reduces friction, prevents crater wear, and delivers long, stable tool life during continuous steel machining.
Featuring the highly versatile GU Universal Chipbreaker, this insert incorporates a 3D bump geometry designed to lower cutting forces while controlling chips efficiently across a wide envelope of depths of cut (ap: 0.8mm to 3.5mm) and feed rates (fn: 0.12mm to 0.40mm). It is the ideal workhorse insert for carbon steel, alloy steel, and structural steel turning on production CNC lathes.
2. Product Key Features
- 6 Usable Cutting Edges: Negative 60° triangular geometry provides 6 sharp, durable cutting corners for optimal tooling cost efficiency.
- Absotech® AC820P Grade: Superior smooth CVD coating technology offering exceptional crater and flank wear resistance at high cutting speeds.
- GU General-Purpose Chipbreaker: Optimizes chip curling and evacuation to avoid stringy chips and machine downtime.
- Low Cutting Resistance: Reduced radial force lowers vibration and workpiece deflection on long, slender shafts.
- Dual ISO / ANSI Standard Compliance: Manufactured in strict accordance with ISO 1832 and ANSI B212.4 standards.
ISO / ANSI Code Nomenclature Breakdown
Detailed geometric interpretation of the TNMG160404N-GU specification standard:
3. Technical Parameters & Metric vs Imperial Comparison
| Specification Parameter | Metric Value (ISO Designation) | Imperial Value (ANSI Designation) |
|---|---|---|
| Product Model Code | TNMG160404N-GU AC820P | TNMG 331-GU 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") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150" |
| Insert Substrate Grade | Sumitomo AC820P (CVD Al2O3/TiCN Wear-Resistant) | Sumitomo AC820P (CVD Al2O3/TiCN Wear-Resistant) |
Recommended Speeds & Feeds (Cutting Parameters)
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| ISO P: Carbon Steel (1045 / C45 Continuous) | 180 - 350 m/min (590 - 1150 SFM) |
0.15 - 0.40 mm/rev (0.006 - 0.016 IPR) |
1.0 - 3.5 mm (0.039 - 0.138 in) |
| ISO P: Alloy Steel (4140 / 4340 High Speed) | 150 - 300 m/min (490 - 980 SFM) |
0.12 - 0.35 mm/rev (0.005 - 0.014 IPR) |
0.8 - 3.0 mm (0.031 - 0.118 in) |
| ISO P: Cast Steel & Structural Steel | 140 - 280 m/min (460 - 920 SFM) |
0.12 - 0.32 mm/rev (0.005 - 0.013 IPR) |
0.8 - 3.0 mm (0.031 - 0.118 in) |
Fits all standard ISO turning toolholders with a 60° negative pocket design:
MTJNR / MTJNL 2020K16 Holder MTJNR / MTJNL 2525M16 Holder WTJNR / WTJNL 2020K16 Holder DTJNR / DTJNL 2525M16 Holder Boring Bar: S25S-MTJNR164. Applications & Industrial Operations
- High-Speed Shaft & Axle Turning: Machining 1045 carbon steel shafts and drive components at elevated cutting speeds.
- Medium-to-Rough Steel Profiling: General lathe production of alloy steel components demanding predictable, extended tool life.
- Mass Production CNC Machining: Excellent for automated CNC lathe cells where reliable chip breaking prevents chip tangling.
5. Compatibility & Machine Integration
Fully compatible with all CNC turning lathes, horizontal/vertical turning centers, and engine lathes. Fits standard ISO TNMG160404 / ANSI TNMG 331 toolholders from Sandvik Coromant, Kennametal, Iscar, Kyocera, Tungaloy, Walter, and Seco.
6. Grade Comparison & Equivalent Models Matrix
| Brand | Equivalent Grade | Equivalent Chipbreaker | ISO Material Application |
|---|---|---|---|
| Sumitomo Electric | AC820P | GU | ISO P05-P25 |
| Sandvik Coromant | GC4425 / GC4325 | PM / PR | ISO P15-P25 |
| Kennametal | KCP10B / KCP25B | MP / MS | ISO P10-P25 |
| Iscar | IC8150 / IC8250 | M3P / GN | ISO P10-P25 |
| Kyocera | CA515 / CA525 | MU / MG | ISO P10-P25 |
7. Why Choose Us?
- 100% Guaranteed Original Sumitomo: Direct factory authorization channels ensure authentic Absotech® coating quality and performance.
- Technical Machining Support: Professional guidance on optimizing feeds, speeds, and grade selection from senior CNC tooling specialists.
- Fast Dispatch & Industrial Packaging: Original 10-piece factory box packaging ready for immediate global express shipping.
Verified Customer Reviews
Exceptional tool life at high SFM
"We run 1045 steel shafts at 850 SFM. The AC820P grade shows virtually no crater wear after long runs. The GU breaker keeps chips short and manageable."
— David R., Machine Shop Supervisor (United States 🇺🇸)Hervorragende Standzeit bei C45 Stahl
"Sehr zuverlässige Wendeschneidplatte für die Serienfertigung. Absotech-Beschichtung hält die Schnittkante extrem lange scharf."
— Stefan W., CNC-Fertigungsleiter (Germany 🇩🇪)Grande stabilità e durata del tagliente
"Ottimi inserti per tornitura ad alta velocità su acciaio legato. Nessun problema di usura precoce."
— Matteo R., Capo Officina (Italy 🇮🇹)鋼材の高速連続加工で抜群の耐摩耗性を発揮
"AC820PはC45の高速旋削でクレーター摩耗が劇的に抑えられます。GUブレーカのチップコントロールも極めて良好です。"
— Kenji T., Manufacturing Engineer (Japan 🇯🇵)Consistent production turning insert
"Delivers reliable performance and smooth surface finishes on 4140 steel stock."
— Jason M., CNC Turner (United Kingdom 🇬🇧)8. Frequently Asked Questions (AI & Voice Search Optimized)
Troubleshooting & Machining Optimization Guide
| Symptom / Failure Mode | Root Cause Analysis | Recommended Action |
|---|---|---|
| Flank / Crater Wear Rate Too High | Cutting speed Vc exceeds recommended envelope or insufficient coolant flow. | Reduce cutting speed Vc by 10-15% or optimize coolant positioning directly at the cutting edge. |
| Chipping / Edge Micro-Fracture | Interrupted cut forces too heavy for general-purpose grade AC820P. | Switch to tougher AC830P grade or slightly decrease feed rate fn upon cut entry. |
| Long Stringy Chips / Nesting | Depth of cut ap or feed rate fn below GU chipbreaker activation threshold. | Increase feed rate fn above 0.15 mm/rev or increase depth of cut ap to properly engage the chip breaker bump. |
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.