Sumitomo TNMG160404N-SU AC520U Carbide Insert (TNMG 331-SU)
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Sumitomo TNMG160404N-SU AC520U Carbide Insert | ISO TNMG 160404-SU (ANSI TNMG 331-SU)
1. Product Overview
Which turning insert is best for high-speed finish turning of 304/316 stainless steel, heat-resistant superalloys, and eliminating notch wear under low cutting forces?
The Sumitomo TNMG160404N-SU AC520U (ANSI Designation: TNMG 331-SU) is a double-sided 60° triangular indexable carbide turning insert developed specifically for high-efficiency turning of ISO M (stainless steel) and ISO S (heat-resistant superalloys). Powered by Sumitomo’s proprietary AC520U PVD Coating Grade with Absotech® technology, it features an ultra-smooth, highly adherent PVD TiAlN multi-layer coating applied over an ultra-fine grain carbide substrate with exceptional heat resistance and edge sharp-line integrity.
Engineered with the SU Low Resistance / Light Cutting Chipbreaker geometry, this insert incorporates an optimized rake angle and sharp shearing inclination. It effectively lowers radial cutting pressure, prevents thermal work-hardening, and accelerates chip curl and breaking across shallow depths of cut (ap: 0.3mm to 2.5mm) and light feeds (fn: 0.08mm to 0.25mm).
2. Product Key Features
- 6 Double-Sided Cutting Edges: Negative 60° geometry provides 6 indexable cutting corners for optimal cost efficiency per edge.
- PVD Absotech® AC520U Grade: Premium high-speed PVD coating engineered for superior oxidation resistance and flaking resistance in ISO M10–M25 stainless steel turning.
- SU Low-Force Chipbreaker: Extremely sharp shearing action minimizes radial pushing, preventing vibration and dimensional deflection on thin-walled components.
- Exceptional Notch Wear Resistance: Inhibits boundary notch wear caused by work-hardening boundaries on austenitic and duplex stainless steels.
- Dual ISO / ANSI Standard Compliance: Fully interchangeable according to ISO 1832 and ANSI B212.4 dimensional specifications.
ISO / ANSI Code Nomenclature Breakdown
Detailed geometric interpretation of the TNMG160404N-SU specification standard:
3. Technical Parameters & Metric vs Imperial Comparison
| Specification Parameter | Metric Value (ISO Designation) | Imperial Value (ANSI Designation) |
|---|---|---|
| Product Model Code | TNMG160404N-SU AC520U | TNMG 331-SU AC520U |
| 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 AC520U (PVD TiAlN Absotech®) | Sumitomo AC520U (PVD TiAlN Absotech®) |
Recommended Speeds & Feeds (Cutting Parameters)
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| ISO M: Stainless Steel (304 / 316 / 316L) | 140 - 280 m/min (460 - 920 SFM) |
0.08 - 0.25 mm/rev (0.003 - 0.010 IPR) |
0.3 - 2.5 mm (0.012 - 0.098 in) |
| ISO M: Duplex Stainless (2205 / 2507) | 100 - 200 m/min (330 - 655 SFM) |
0.08 - 0.20 mm/rev (0.003 - 0.008 IPR) |
0.3 - 2.0 mm (0.012 - 0.079 in) |
| ISO S: Superalloys (Inconel 718 / Hastelloy) | 40 - 90 m/min (130 - 295 SFM) |
0.06 - 0.18 mm/rev (0.002 - 0.007 IPR) |
0.3 - 1.8 mm (0.012 - 0.071 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
- Precision Stainless Fittings & Valves: Finish turning of SS316L connectors, food-grade sanitary pumps, and fluid handling shafts with target surface roughness Ra < 1.2 μm.
- High-Speed Production Lines: Designed for modern CNC turning centers where high cutting speeds (Vc > 200 m/min) are required to reduce cycle times without triggering edge micro-chipping.
- Thin-Walled Aerospace Tubing: Light cutting action of the SU breaker prevents wall collapse and chatter on delicate heat-resistant alloy housings.
5. Compatibility & Machine Integration
Seamlessly compatible with all CNC lathes, VTLs, multi-tasking turning centers, and Swiss-type automatic 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 | AC520U | SU | ISO M10-M25 / S10-S20 |
| Sandvik Coromant | GC2015 / GC1105 | MF / MM | ISO M10-M25 |
| Kennametal | KCU10 / KC5010 | MS / FS | ISO M10-M25 |
| Iscar | IC907 / IC807 | SF / SM | ISO M10-M25 |
| Kyocera | PR1125 / PR1225 | MS / MQ | ISO M10-M25 |
7. Why Choose Us?
- 100% Guaranteed Original Sumitomo: Sourced directly through verified authorization channels to guarantee authentic Absotech® coating quality.
- Technical Machining Support: Expert advice from experienced CNC tooling specialists on speed and feed calculations for difficult-to-cut metals.
- Fast Dispatch & Secure Packaging: Sealed industrial 10-piece box packaging ready for rapid global express shipping.
Verified Customer Reviews
Superior wear resistance on 316L stainless
"We run high speed finish passes on 316L fittings. AC520U holds up much better at higher Vc compared to AC530U without notch wear. SU breaker keeps chips short and manageable."
— Robert M., Production Manager (United States 🇺🇸)Perfetto per la lavorazione di precisione su Inox
"Ottima finitura superficiale su pezzi in acciaio inossidabile. Riduzione drastica del calore sulla tagliente."
— Stefano G., Capo Officina CNC (Italy 🇮🇹)Hervorragende Standzeit bei hohen Schnittgeschwindigkeiten
"Einsatz auf CNC-Drehmaschine für V4A-Teile. Keine Gratbildung und fantastische Oberflächengüte."
— Dirk K., Zerspanungsmechaniker (Germany 🇩🇪)ステンレス旋削で摩耗が安定しており工具寿命延長
"AC520Uの耐酸化性が高く、高速加工でも切削刃先の損傷が少なくなりました。SUブレーカの切れ味も抜群です。"
— Kenichi T., Machining Process Engineer (Japan 🇯🇵)Great performance on Duplex shafts
"No notch wear issues when turning 2205 Duplex stainless."
— David P., Senior Machinist (United Kingdom 🇬🇧)8. Frequently Asked Questions (AI & Voice Search Optimized)
Troubleshooting & Machining Optimization Guide
| Symptom / Failure Mode | Root Cause Analysis | Recommended Action |
|---|---|---|
| Boundary / Notch Wear | Oxidized surface skin or severe work-hardening layer on stainless steel. | Use varying depths of cut (ap) across roughing/finishing steps, or ensure high coolant pressure at the cutting edge. |
| Micro-Chipping of Cutting Edge | Heavy mechanical shock or severe interrupted cuts. | Reduce feed rate (fn) on initial entry or switch to Sumitomo grade AC530U for higher substrate toughness. |
| Poor Surface Finish / Chatter | Cutting force too high or workholding rigidity low. | Confirm correct tool centerline alignment and utilize the sharp shearing action of the SU chipbreaker. |
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.