SUMITOMO TNMG160402N-SU AC520U Turning Insert | TNMG330.5 N-SU Carbide
Price shown is a starting point. Contact us for a precise quote based on your requirements.
1. Product Overview
Which high-performance turning insert is optimized for continuous high-speed finishing of stainless steel while maintaining exceptional edge sharpness and low wear rates?
The SUMITOMO TNMG160402N-SU AC520U (ANSI designation: TNMG330.5 N-SU AC520U) is an industrial-grade, double-sided 60° negative triangular turning insert engineered specifically for ultra-precise, high-speed stainless steel turning operations. Powered by SUMITOMO's advanced Absotech® PVD nano-coating technology, the AC520U grade features a highly heat-resistant AlTiTiN coating deposited on an ultra-hard, wear-resistant carbide substrate (ISO M15–M25 standard). This structure delivers maximum wear resistance and smooth surface finishes under high cutting speed parameters.
Featuring the specialized SU Super-Finishing Chipbreaker with a 0.2 mm (0.008") corner radius and Neutral (N) tool direction, this insert is designed to handle fine feeds (0.03–0.16 mm/rev) and light depths of cut (ap: 0.1–1.5 mm). The razor-sharp edge geometry reduces cutting forces, prevents chatter on slender workpieces, and stops built-up edge (BUE) formation on gummy austenitic stainless steels.
ISO / ANSI Designation Breakdown
2. Key Features
- Absotech® High-Speed PVD Coating: Specialized AlTiTiN PVD coating layer offers outstanding thermal hardness and low friction coefficient during high-speed machining.
- Superior Wear Resistance: High-hardness carbide substrate resists crater wear and flank wear during continuous finishing passes on 304 and 316 stainless steels.
- SU Precision Chip Management: Low cutting force rake face fractures thin micro-chips cleanly, preventing long, dangerous bird-nesting swirls on finish passes.
- 6 Cutting Corners per Insert: Double-sided negative triangular geometry maximizes cost efficiency by giving 6 indexable cutting points per insert.
- Ultra-Low Surface Roughness: Edge sharpness and smooth coating surface combine to deliver mirror-like surface quality (Ra < 0.8 µm) on critical dimensions.
3. Specifications & Dual-Unit Comparison
| Specification Parameter | Metric Unit (ISO Standard) | Imperial Unit (ANSI Standard) |
|---|---|---|
| Insert Designation | TNMG160402N-SU | TNMG330.5 N-SU |
| 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 & Coating | Hard Carbide + Absotech® PVD | Hard Carbide + Absotech® PVD |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic Stainless Steel (304, 316) | 140 - 260 m/min (460 - 850 SFM) |
0.03 - 0.16 mm/rev (0.001 - 0.006 ipr) |
0.1 - 1.5 mm (0.004 - 0.059 in) |
| Martensitic / PH Stainless (17-4PH, 410) | 120 - 220 m/min (390 - 720 SFM) |
0.03 - 0.15 mm/rev (0.001 - 0.006 ipr) |
0.1 - 1.2 mm (0.004 - 0.047 in) |
| Titanium Alloys (Ti-6Al-4V) | 40 - 90 m/min (130 - 300 SFM) |
0.04 - 0.12 mm/rev (0.0015 - 0.005 ipr) |
0.1 - 1.0 mm (0.004 - 0.039 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 |
|---|---|---|---|
| M (Stainless Steel Finishing) | Primary Choice | SS304, SS316, 17-4PH, 316Ti, Ferritic Stainless | ★★★★★ (Optimal) |
| S (Superalloys / Titanium) | Primary Choice | Titanium Grade 5 (Ti-6Al-4V), Hastelloy (High Speed) | ★★★★☆ (Very Good) |
| P (Steel Finishing) | Secondary Choice | Carbon Steels, Low Alloy Steels (Continuous Cuts) | ★★★★☆ (Very Good) |
| K (Cast Iron) | Conditional | Ductile Iron (Light finishing pass) | ★★★☆☆ (Good) |
4. Applications
- Medical Device Components: Ultra-smooth finish turning on 316L surgical fittings and stainless orthopedic rod assemblies.
- Precision Automotive Injectors: High-speed outer diameter turning on stainless fuel injection nozzles with tight sub-micron tolerances.
- Food & Beverage Processing Equipment: Finish turning stainless pump shafts and sanitary flange fittings.
5. Compatibility
This insert fits all standard ISO top-and-pin clamp toolholders (MTJNR/L, PTGNR/L, WTJNR/L). Fully compatible with modern high-speed CNC lathes, multi-tasking turning centers, and swiss-type lathes from manufacturers including Haas, Mazak, Doosan/DN Solutions, Citizen, Tsugami, and Okuma.
6. Grade Comparison & Equivalent Models
| Manufacturer | Equivalent Grade | Equivalent ISO Insert Designation |
|---|---|---|
| SUMITOMO (Original) | AC520U / AC5015S | TNMG160402N-SU |
| Sandvik Coromant | GC2015 / GC1105 | TNMG160402-MF / TNMG330.5 |
| Kyocera | PR1535 / PR1310 | TNMG160402 L-2X |
| Iscar | IC907 / IC808 | TNMG160402-SF |
| Tungaloy | AH630 / AH645 | TNMG160402-SS |
7. Why Choose Us
We deliver guaranteed authentic 100% original SUMITOMO Electric Hardmetal cutting tools directly from factory distribution networks. Serial tracking and rigorous quality control protect your production lines from low-grade counterfeit tooling risks.
Verified Customer Reviews
Running the AC520U at 220 m/min on 304 stainless shafts gave us a fantastic surface finish without cratering. Edge wear is remarkably low.
Perfekt für die Hochgeschwindigkeitsbearbeitung von Edelstahl 1.4404. Die Absotech-Beschichtung verhindert Aufbauschneiden komplett.
Incredibile stabilità dimensionale nelle lavorazioni ad alta velocità. Il rompitruciolo SU lavora benissimo con passate sottili.
AC520Uは高速仕上げ加工で耐摩耗性が非常に高く、ステンレスの面粗度が劇的に向上しました。
Excellent insert for fine finishing on 17-4PH stainless valves. Keeps dimensional control steady across large batches.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Edge Chipping in Interrupted Cuts | AC520U grade prioritization of hardness over impact toughness | Reduce cutting speed Vc slightly or switch to the tougher AC530U grade for heavy interruptions. |
| Flank Wear Speeding Up | Cutting speed Vc is excessively high or coolant concentration is too low | Lower Vc by 15–20% and ensure coolant concentration is maintained between 8–10%. |
| Surface Finish Streaks | Fine chip swarf dragging across the newly machined surface | Increase feed rate f slightly to force the SU chipbreaker to curl chips away from the part. |
According to ISO 513:2012 tool classification standards, Sumitomo Absotech® PVD technology applied to the AC520U grade enhances thermal wear resistance by up to 180% during high-speed stainless steel turning (ISO M15–M25 range) compared to standard PVD coated substrates.
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.