SUMITOMO TNGG160402R-FY AC520U PVD Carbide Insert | TNGG330.5R-FY
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1. Product Overview
Which turning insert is best suited for high-speed light finishing cuts on heat-resistant superalloys and austenitic stainless steel without thermal cracking or notch wear?
The SUMITOMO TNGG160402R-FY AC520U (ANSI designation: TNGG330.5R-FY AC520U) is a high-precision Class G perimeter-ground, double-sided 60° negative triangular turning insert engineered for ultra-fine finishing. Powered by SUMITOMO's AC520U Super PVD Coating Grade—featuring an ultra-smooth, heat-resistant TiAlN multi-layer coating applied over a high-hardness micro-grain carbide substrate—this insert excels at extreme thermal resistance, notch wear prevention, and edge wear control across ISO M05–M25, S05–S20, and P05–P25 application ranges.
Equipped with a micro 0.2 mm (0.008") corner radius, a Right-Hand (R) cutting direction, and the highly positive FY Fine-Finishing Light-Cut Chipbreaker, this insert guarantees complete chip breaking at light cutting depths (ap: 0.05–1.2 mm) and fine feeds (f: 0.03–0.12 mm/rev). It eliminates workpiece deflection on slender parts and prevents work-hardening, yielding pristine surface finishes (Ra < 0.4 µm) in automated precision CNC environments.
ISO / ANSI Designation Breakdown
2. Key Features
- High-Speed AC520U PVD Grade: Harder substrate paired with heat-resistant TiAlN coating allows higher cutting speeds (Vc) on Inconel, Titanium, and Stainless Steels compared to standard PVD grades.
- Class G Fully Ground Edge: Delivers exceptional indexing accuracy (±0.025 mm IC), ensuring dimensional consistency across part lots on Swiss-type lathes.
- 0.2 mm Micro Corner Radius: Minimizes radial push forces, preventing vibration and chatter on long shafts and thin-wall tubes.
- FY Light-Cut Chipbreaker: Highly positive rake angle shears through gummy materials cleanly, preventing chip wrapping and surface scratching.
- 6 Usable Cutting Edges: Double-sided design doubles the cutting edge count compared to positive inserts, maximizing cost efficiency.
3. Specifications & Dual-Unit Comparison
| Specification Parameter | Metric Unit (ISO Standard) | Imperial Unit (ANSI Standard) |
|---|---|---|
| Insert Designation | TNGG160402R-FY | TNGG330.5R-FY |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.1875" (3/16") |
| Corner Radius (RE) | 0.2 mm | 0.0078" (0.008") |
| Hole Diameter (D1) | 3.81 mm | 0.150" |
| Substrate Grade | Super PVD Hard Carbide (AC520U) | Super PVD Hard Carbide (AC520U) |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Stainless Steel (304, 316, 316L, 15-5PH) | 150 - 280 m/min (490 - 920 SFM) |
0.03 - 0.12 mm/rev (0.001 - 0.005 ipr) |
0.05 - 1.2 mm (0.002 - 0.047 in) |
| Heat Resistant Alloys (Inconel 718, Waspaloy) | 50 - 110 m/min (165 - 360 SFM) |
0.03 - 0.10 mm/rev (0.001 - 0.004 ipr) |
0.05 - 1.0 mm (0.002 - 0.039 in) |
| Titanium Alloys (Ti-6Al-4V) | 60 - 130 m/min (195 - 425 SFM) |
0.03 - 0.12 mm/rev (0.001 - 0.005 ipr) |
0.05 - 1.2 mm (0.002 - 0.047 in) |
Recommended Compatible Toolholders (ISO Top & Pin Clamp External Turning Holders):
Compatible with standard toolholders: MTJNR/L 2020K16, MTJNR/L 2525M16, WTJNR/L 2020K16, PTGNR/L 2020K16
Workpiece Material Matrix (ISO 513 Standard)
| ISO Material Group | Suitability | Common Grade Examples | Performance Rating |
|---|---|---|---|
| S (Exotic / Superalloys) | Primary Choice | Inconel 718, Hastelloy, Titanium Grade 5 | ★★★★★ (Optimal) |
| M (Stainless Steel) | Primary Choice | Austenitic (304, 316), Martensitic (420), PH Stainless | ★★★★★ (Optimal) |
| P (Steel Finishing) | Secondary Choice | Carbon Steels (1045), Alloy Steels (4140, 8620) | ★★★★☆ (Very Good) |
| K (Cast Iron) | Conditional | Chilled Iron, Nodular Iron (Light finishing only) | ★★☆☆☆ (Limited) |
4. Applications
- Aerospace Turbine Engine Components: Precision finish turning of heat-resistant nickel-alloy shaft seal faces requiring strict Ra values and thermal control.
- Medical Implant Turning: High-speed finishing on Titanium grade 5 bone plates and joint fittings requiring high surface integrity.
- Swiss Machining Stainless Parts: External finishing of miniature 316L fittings on Tsugami and Citizen Swiss automatics.
5. Compatibility
This insert fits all standard ISO turning toolholders equipped with top-and-pin clamp locking mechanisms (MTJNR/L, PTGNR/L, WTJNR/L). Fully compatible with precision CNC lathes and automatic turning centers from Citizen, Tsugami, Star, Haas, Mazak, Okuma, and Doosan/DN Solutions.
6. Grade Comparison & Equivalent Models
| Manufacturer | Equivalent Grade | Equivalent ISO Insert Designation |
|---|---|---|
| SUMITOMO (Original) | AC520U (Higher Speed) / AC530U | TNGG160402R-FY |
| Kyocera | PR1310 / PR1125 | TNGG160402R-AH3 / TNGG330.5R |
| Tungaloy | SH730 / AH725 | TNGG160402R-01 |
| Sandvik Coromant | 1115 / GC1105 | TNGG160402-SGF |
| Iscar | IC907 / IC807 | TNGG 160402R-F3M |
7. Why Choose Us
We supply 100% original SUMITOMO Electric Hardmetal cutting inserts directly sourced from authorized supply channels. Standardized quality controls and full traceability guarantee reliable cutting edge performance across automated CNC production runs.
Verified Customer Reviews
AC520U is the absolute sweet spot for Titanium grade 5 finishing. The edge sharpness with the 0.2mm radius holds size without pushing the material. Outstanding insert performance.
Perfekte Schneidplatte für Inconel-Bearbeitung. Mit der AC520U-Sorte konnten wir die Schnittgeschwindigkeit deutlich erhöhen, ohne dass Kerbverschleiß auftritt.
Ottima placchetta per tornitura fine su acciai inossidabili. Il rompitruciolo FY lavora benissimo anche con passate molto leggere.
AC520UはAC530Uより耐摩耗性が高く、高速仕上げで抜群の寿命を発揮します。面粗度も非常に安定しています。
Switched to AC520U for finishing 316L fittings on our Swiss lathe. Surface finish is consistently smooth with zero burrs on the shoulders.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Notch Wear at Depth of Cut Line | Work-hardening layer on stainless/superalloys wearing down the cutting line | Vary the depth of cut ap slightly across finishing passes or increase cutting speed Vc. |
| Fine Surface Chatter Marks | Radial push force causes slender part deflection | Verify tool overhang is minimized and ensure feed rate f matches the 0.2 mm corner radius recommendations. |
| Built-Up Edge (BUE) Formation | Cutting speed Vc is too low for ductile material shearing | Increase cutting speed Vc into the recommended high-speed range for AC520U and apply high-pressure coolant. |
According to ISO 513:2012 classification standards, SUMITOMO AC520U super PVD coated carbide grade provides exceptional wear resistance and thermal stability at elevated cutting temperatures up to 1000°C, making it superior for high-speed finishing on exotic alloys and stainless steels (ISO M05–M25 / S05–S20 range).
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.