SUMITOMO TNGG160402L-FX AC520U PVD Carbide Insert | TNGG330.5L-FX
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1. Product Overview
Which left-hand precision turning insert is best suited for high-speed ultra-fine super-finishing cuts on austenitic stainless steel and nickel-base superalloys on back-spindle CNC Swiss lathes?
The SUMITOMO TNGG160402L-FX AC520U (ANSI designation: TNGG330.5L-FX AC520U) is a high-precision Class G perimeter-ground, double-sided 60° negative triangular left-hand turning insert built for extreme surface integrity. Powered by SUMITOMO's AC520U Super PVD Coating Grade—featuring a smooth, heat-resistant TiAlN multi-layer PVD coating over an ultra-hard micro-grain carbide substrate—this insert delivers outstanding thermal resistance, notch wear suppression, and high-speed edge wear resistance across ISO M05–M25, S05–S20, and P05–P25 material ranges.
Featuring a micro 0.2 mm (0.008") corner radius, Left-Hand (L) cutting orientation, and the ultra-positive FX Super-Finishing Chipbreaker, this insert guarantees active chip curl and break under extremely low depth-of-cut conditions (ap: 0.05–0.8 mm) and fine feed rates (f: 0.02–0.10 mm/rev). It eliminates workpiece deflection on delicate parts and prevents heat buildup, delivering flawless, mirror-like surface finishes (Ra < 0.2–0.4 µm) in high-throughput CNC environments.
ISO / ANSI Designation Breakdown
2. Key Features
- High-Speed AC520U PVD Coating: Hard substrate coupled with heat-resistant TiAlN PVD layer enables higher cutting speeds (Vc) on Inconel, Titanium, and Stainless Steels without edge softening.
- Class G Precision Ground Edge: Delivers tight indexing repeatability (±0.025 mm IC tolerance), ensuring identical offset values across part changes on gang-tool Swiss lathes.
- Left-Hand Cutting Orientation: Engineered specifically for sub-spindle turning, left-hand gang tool positions, and back-turning machining operations.
- FX Super-Finishing Geometry: High-rake sharp rake face cleanly shears stringy material, preventing bird-nesting chips and part scratching at low depth-of-cut settings.
- 6 Usable Cutting Edges: Double-sided negative profile provides 6 cutting edges per insert, reducing tooling costs compared to single-sided positive inserts.
3. Specifications & Dual-Unit Comparison
| Specification Parameter | Metric Unit (ISO Standard) | Imperial Unit (ANSI Standard) |
|---|---|---|
| Insert Designation | TNGG160402L-FX | TNGG330.5L-FX |
| 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, 17-4PH) | 150 - 280 m/min (490 - 920 SFM) |
0.02 - 0.10 mm/rev (0.0008 - 0.004 ipr) |
0.05 - 0.8 mm (0.002 - 0.031 in) |
| Heat Resistant Alloys (Inconel 718, Waspaloy) | 50 - 110 m/min (165 - 360 SFM) |
0.02 - 0.08 mm/rev (0.0008 - 0.003 ipr) |
0.05 - 0.6 mm (0.002 - 0.024 in) |
| Titanium Alloys (Ti-6Al-4V) | 60 - 130 m/min (195 - 425 SFM) |
0.02 - 0.10 mm/rev (0.0008 - 0.004 ipr) |
0.05 - 0.8 mm (0.002 - 0.031 in) |
Recommended Compatible Toolholders (ISO Top & Pin Clamp Left-Hand Turning Holders):
Compatible with standard toolholders: MTJNL 2020K16, MTJNL 2525M16, WTJNL 2020K16, PTGNL 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 Alloys | ★★★★★ (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 | Nodular Iron, Gray Cast Iron (Light finishing) | ★★☆☆☆ (Limited) |
4. Applications
- Swiss Sub-Spindle Back Turning: High-precision finish turning on the secondary spindle of Swiss automatic lathes for medical fittings and micro valves.
- Aerospace Fastener Thread Reliefing: High-speed finish grooving and shoulder turning on Titanium alloy bolts using left-hand tool setups.
- Precision Automotive Valve Stems: Ultra-fine profile turning on stainless steel fuel injector components demanding Ra < 0.2 µm.
5. Compatibility
This insert fits all standard ISO left-hand external turning toolholders featuring top-and-pin clamp clamping systems (MTJNL, PTGNL, WTJNL). Fully compatible with automatic sliding-head CNC Swiss lathes and 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 | TNGG160402L-FX |
| Kyocera | PR1310 / PR1125 | TNGG160402L-S |
| Tungaloy | SH730 / AH725 | TNGG160402L-01 |
| Sandvik Coromant | 1115 / GC1105 | TNGG160402-SFL |
| Iscar | IC907 / IC807 | TNGG 160402L-F2M |
7. Why Choose Us
We supply 100% genuine SUMITOMO Electric Hardmetal indexable inserts directly through certified factory supply routes. Quality batch testing guarantees uniform edge geometry, reliable PVD adhesion, and exact offset precision for continuous automated CNC production.
Verified Customer Reviews
Finding high-quality left-hand precision ground inserts for our back-spindle sub-operations used to be a challenge. The TNGG160402L-FX AC520U holds ±0.0002" all day long on 316L medical pins.
Hervorragende Linksausführung für Drehmaschinen. Die FX-Geometrie bricht die Späne selbst bei minimaler Schnitttiefe tadellos.
Inserti di qualità eccezionale. Il grado AC520U garantisce una durata del tagliente superiore nelle lavorazioni ad alta velocità su lega di titanio.
サブ主軸での背後加工に最適です。AC520Uの耐摩耗性が高く、仕上げ面の粗さが非常に安定しています。
Using these left-hand inserts on our Citizen gang slide for Inconel component finishing. Edge sharpness is top-tier and chip control is consistent.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Long Ribbon Chips Wrapping Workpiece | Depth of cut ap or feed rate f is lower than the active FX chipbreaking envelope | Slightly increase feed rate f toward 0.05-0.08 mm/rev or verify the depth of cut is above 0.05 mm. |
| Workpiece Surface Roughness (Ra) Deterioration | Micro-chipping on edge or spindle axis height misalignment | Verify tool center height is aligned within ±0.03 mm of center line and inspect edge under magnification. |
| Rapid Flank Wear at High Speeds | Insufficient coolant delivery causing thermal degradation | Ensure high-pressure coolant is directed straight to the cutting edge/rake interface to maximize AC520U PVD coating performance. |
Under ISO 513:2012 classification standards, SUMITOMO AC520U super PVD coated carbide grade delivers continuous heat resistance up to 1000°C, making it the benchmark grade choice for high-speed finishing across ISO M05–M25 stainless steels and ISO S05–S20 superalloys.
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.