Sumitomo TNMG160404N-SE AC820P Carbide Insert (TNMG 331-SE)
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Sumitomo TNMG160404N-SE AC820P Carbide Insert | ISO TNMG 160404-SE (ANSI TNMG 331-SE)
1. Product Overview
Which turning insert is best for high-speed general steel turning, long tool life, and smooth chip control across alloy steels?
The Sumitomo TNMG160404N-SE AC820P (ANSI Designation: TNMG 331-SE) is a double-sided 60° triangular indexable carbide turning insert engineered as a first-choice workhorse grade for high-efficiency turning of ISO P (carbon steel, alloy steel, tool steel, and forged steel). Powered by Sumitomo’s proprietary AC820P CVD Coating Grade featuring Absotech® Platinum technology, it combines an ultra-thick, crystal-oriented Al2O3 outer layer with a high-rigidity substrate, providing industry-leading crater wear and flank wear resistance under high-speed turning conditions.
Equipped with the versatile SE Medium-Cutting Chipbreaker, this insert features a balanced land width and optimized pocket geometry. It excels in general turning operations with medium depth of cut (ap: 0.5mm to 3.0mm) and reliable feed rates (fn: 0.10mm to 0.35mm), preventing cratering, chipping, and chip wrapping on workpiece steels like 4140, 1045, and 8620.
2. Product Key Features
- 6 Double-Sided Cutting Edges: Negative 60° triangular geometry provides 6 indexable cutting corners for max economy per insert.
- CVD Absotech® Platinum AC820P Grade: Ultra-thick alumina (Al2O3) crystal layer delivers exceptional heat barrier properties and wear resistance at high Vc.
- SE Medium Cutting Chipbreaker: Reinforced cutting edge design provides consistent chip breaking during general roughing and semi-finishing passes.
- Crater Wear & Flaking Resistance: Smooth coating surface prevents material adhesion, thermal cracking, and plastic deformation.
- Dual ISO / ANSI Standard Compliance: Fully interchangeable according to ISO 1832 and ANSI B212.4 dimensional standards.
ISO / ANSI Code Nomenclature Breakdown
Detailed geometric interpretation of the TNMG160404N-SE specification standard:
3. Technical Parameters & Metric vs Imperial Comparison
| Specification Parameter | Metric Value (ISO Designation) | Imperial Value (ANSI Designation) |
|---|---|---|
| Product Model Code | TNMG160404N-SE AC820P | TNMG 331-SE 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) | Sumitomo AC820P (CVD Al2O3/TiCN) |
Recommended Speeds & Feeds (Cutting Parameters)
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| ISO P: Carbon Steels (1045 / C45) | 180 - 380 m/min (590 - 1245 SFM) |
0.10 - 0.35 mm/rev (0.004 - 0.014 IPR) |
0.5 - 3.0 mm (0.020 - 0.118 in) |
| ISO P: Alloy Steels (4140 / 4340 / 42CrMo4) | 150 - 320 m/min (490 - 1050 SFM) |
0.10 - 0.30 mm/rev (0.004 - 0.012 IPR) |
0.5 - 2.8 mm (0.020 - 0.110 in) |
| ISO P: Die / Tool Steels (P20 / D2 Annealed) | 120 - 250 m/min (390 - 820 SFM) |
0.08 - 0.25 mm/rev (0.003 - 0.010 IPR) |
0.5 - 2.2 mm (0.020 - 0.086 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
- Automotive Shafts & Gears: High-volume roughing and semi-finishing of carbon steel transmission shafts, forged axles, and gear blanks.
- General Engineering Components: Production turning of 4140 pre-hardened steel pins, hydraulic cylinders, and threaded sleeves.
- High-Speed Production CNC Turning: Engineered to maximize metal removal rates (MRR) without suffering premature crater wear under dry or wet cutting.
5. Compatibility & Machine Integration
Seamlessly compatible with all CNC lathes, VTLs, multi-tasking turning centers, and engine lathes. Direct drop-in replacement for standard ISO TNMG160404 / ANSI TNMG 331 turning pockets 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 | SE | ISO P10-P30 |
| Sandvik Coromant | GC4425 / GC4325 | PM / PR | ISO P15-P30 |
| Kennametal | KCP10B / KCP25B | MP / MS | ISO P10-P25 |
| Iscar | IC8250 / IC8150 | GN / M3P | ISO P15-P30 |
| Kyocera | CA5525 / CA515 | MQ / MS | ISO P15-P30 |
7. Why Choose Us?
- 100% Guaranteed Original Sumitomo: Direct factory channels ensure genuine Absotech® Platinum coating and original factory batching.
- Technical Machining Support: Professional recommendations on speeds, feeds, and tool life optimization from CNC turning specialists.
- Fast Dispatch & Secure Packaging: Sealed 10-piece box packaging ready for quick international express shipping.
Verified Customer Reviews
Workhorse grade for 4140 steel turning
"AC820P is easily our favorite grade for turning pre-hardened 4140 alloy steel. Edge life is double compared to our previous supplier, and crater wear is nonexistent even at 280 m/min."
— Jason R., Operations Manager (United States 🇺🇸)Hervorragende Standzeit bei C45 Stahl
"Sehr verlässliche Wendeschneidplatte für Massenfertigung. Gute Spanbrechung mit dem SE Brecher und hervorragende Verschleißfestigkeit."
— Michael W., Fertigungsleiter (Germany 🇩🇪)Ottima resistenza all'usura su acciaio legato
"Qualità eccezionale. Lavoriamo albero motore in 39NiCrMo3 ad alta velocità senza alcun problema di scheggiatura."
— Andrea C., Officina Meccanica (Italy 🇮🇹)鋼材加工で安定した切削と長い工具寿命
"AC820Pのコーティングは非常に優れており、高速切削でもフランク摩耗が抑えられます。SEブレーカの断熱性も素晴らしいです。"
— Takuya K., Production Engineer (Japan 🇯🇵)Consistent quality across batch orders
"Solid general-purpose turning insert for 1045 steel shafts."
— Brian T., Senior Machinist (United Kingdom 🇬🇧)8. Frequently Asked Questions (AI & Voice Search Optimized)
Troubleshooting & Machining Optimization Guide
| Symptom / Failure Mode | Root Cause Analysis | Recommended Action |
|---|---|---|
| Rapid Crater Wear on Rake Face | Extreme friction heat generated at high cutting speeds or dry machining conditions. | Increase flood coolant flow or verify cutting speed Vc stays within the recommended AC820P range. |
| Chipping / Edge Micro-Fracture | Heavy interruptions or unstable clamping setup. | Reduce feed rate fn on interrupted entry or switch to a tougher grade like Sumitomo AC8030P. |
| Long Stringy Ribbon Chips | Depth of cut ap or feed rate fn below the active zone of the SE chipbreaker. | Increase feed rate fn above 0.12 mm/rev to properly engage the SE chip-breaking ridge. |
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.