Sumitomo TNMG160404N-SU AC700G Carbide Insert (TNMG 331-SU)
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Sumitomo TNMG160404N-SU AC700G Carbide Insert | ISO TNMG 160404-SU (ANSI TNMG 331-SU)
1. Product Overview
Which turning insert is best for low cutting resistance, high-speed ductile iron machining, and precision thin-walled cast iron components?
The Sumitomo TNMG160404N-SU AC700G (ANSI Designation: TNMG 331-SU) is a double-sided 60° triangular indexable carbide turning insert specially engineered for high-performance cast iron turning. Utilizing Sumitomo’s specialized AC700G CVD Coating grade, it features an ultra-thick, highly crystalline Al2O3 outer layer and a high-hardness TiCN base layer over a wear-resistant substrate. This specialized grade is designed to resist extreme abrasive flank wear and cratering caused by scale and sand inclusions in ISO K10–K30 grey cast iron, ductile iron, and nodular cast iron.
Combined with the ultra-sharp SU Low Resistance / Light Cutting Chipbreaker geometry, this insert features a high rake angle that minimizes cutting force and friction. It excels on low-rigidity setups, slender iron shafts, thin-walled sleeves, and shallow depths of cut (ap: 0.3mm to 2.5mm) at feed rates (fn: 0.08mm to 0.25mm), ensuring clean cutting action and superior dimensional accuracy.
2. Key Features & Industrial Performance
- 6 Double-Sided Cutting Edges: Negative 60° geometry delivers max economic efficiency per edge for high-volume automotive cast iron turning.
- AC700G Cast Iron CVD Grade: Thick Al2O3 coating technology provides superior resistance to abrasive wear, oxidation, and high cutting temperatures.
- SU Low-Force Chipbreaker: Precision ground rake face reduces radial cutting forces, preventing chatter, vibration, and thin-wall distortion.
- Dual ISO / ANSI Standard Compliance: Fully compliant with ISO 1832 and ANSI B212.4 global dimensional standard specs.
- Precision 0.4 mm (1/64") Corner Radius: Provides low cutting pressure, excellent corner accuracy, and clean micro-finishing (Ra < 1.6 μm).
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 AC700G | TNMG 331-SU AC700G |
| 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 AC700G (CVD Al2O3/TiCN) | Sumitomo AC700G (CVD Al2O3/TiCN) |
Recommended Speeds and Feeds (Dual Unit Reference Table)
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| ISO K: Grey Cast Iron (FC250 / GG25) | 200 - 450 m/min (655 - 1475 SFM) |
0.08 - 0.25 mm/rev (0.003 - 0.010 IPR) |
0.3 - 2.5 mm (0.012 - 0.098 in) |
| ISO K: Ductile Iron (FCD450 / GGG40) | 160 - 380 m/min (525 - 1245 SFM) |
0.08 - 0.22 mm/rev (0.003 - 0.009 IPR) |
0.3 - 2.0 mm (0.012 - 0.079 in) |
| ISO K: Chilled / Alloyed Cast Iron | 120 - 280 m/min (390 - 920 SFM) |
0.10 - 0.22 mm/rev (0.004 - 0.009 IPR) |
0.3 - 2.0 mm (0.012 - 0.079 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
- Automotive Brake Drums & Rotors: Outstanding flank wear resistance during high-speed dry or wet finishing operations.
- Thin-Walled Ductile Iron Sleeves: Sharp shearing cut prevents radial distortion on flexible cast iron parts.
- Pump Housings & Valves: Clean chip breaking across interrupted casting surfaces with zero burr formation.
5. Compatibility & Equipment Integration
Fully compatible with all standard CNC turning centers, VTLs, automatic lathes, and manual engine lathes utilizing ISO-standard toolholders. Direct drop-in replacement 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 | AC700G | SU | ISO K10-K30 |
| Sandvik Coromant | GC3225 / GC3215 | KM / KF | ISO K15-K30 |
| Kennametal | KCK15 / KCK20 | LF / FN | ISO K10-K25 |
| Iscar | IC5010 / IC5025 | SF / F3P | ISO K10-K30 |
| Kyocera | CA315 / CA320 | VF / PP | ISO K15-K30 |
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
Incredible flank life on ductile iron housings
"AC700G grade holds up against abrasive iron sand better than any grade we've tested. The SU breaker eliminates chatter on thin flanges."
— Marcus T., Machine Shop Foreman (United States 🇺🇸)Hervorragende Verschleißfestigkeit bei Gusseisen
"Perfekt für GGG40 Gehäuse. Keine Freiflächenverschleiß-Probleme mehr bei hohen Schnittgeschwindigkeiten."
— Jörg H., CNC Fertigungsleiter (Germany 🇩🇪)Ottima resistenza all'abrasione su ghisa
"Taglio fluido e assenza di vibrazioni su pezzi a parete sottile in ghisa sferoidale. Durata dell'inserto eccezionale."
— Matteo R., Torneria CNC (Italy 🇮🇹)鋳鉄の薄肉加工で摩耗がなく高精度
"ダクタイル鋳鉄の旋削で使用。AC700Gの耐摩耗性が高く、切削抵抗が低いため薄肉ワークでも寸法変化が起きません。"
— Hiroshi M., Production Engineer (Japan 🇯🇵)Great performance on grey iron components
"Reduced tool wear by 30% on brake rotor production line."
— Alan P., CNC Machinist (United Kingdom 🇬🇧)8. Frequently Asked Questions (AI & Voice-Search Optimized)
Machining Troubleshooting & Optimization Guide
| Problem / Wear Pattern | Probable Cause | Corrective Action |
|---|---|---|
| Extreme Flank Wear | Abrasive casting scale or insufficient cutting speed (Vc). | Increase cutting speed (Vc) to leverage Al2O3 thermal coating properties or ensure dry blowing. |
| Chipping on Interrupted Castings | Mechanical shock from severe voids or sand pockets. | Reduce feed rate (fn) entering initial cut or inspect casting pre-machining. |
| Workpiece Vibration | Overhang too long or excessive radial clamping force. | Ensure toolholder shank is rigid and leverage the low-resistance geometry of the SU breaker. |
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.