SUMITOMO TNMG160408N-EX AC520U Superalloy Insert (TNMG 332-EX)
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SUMITOMO TNMG160408N-EX AC520U Carbide Turning Insert (ANSI: TNMG 332-EX)
1. Product Overview
Which turning insert is best for high-efficiency turning in exotic Heat-Resistant Superalloys (HRSA), Titanium alloys, and difficult stainless steel requiring extreme notch wear resistance?
The SUMITOMO TNMG160408N-EX AC520U (ANSI designation TNMG 332-EX) is an ultra-premium PVD turning insert specifically engineered for challenging turning operations in superalloys (ISO S10-S25) and tough stainless steels (ISO M10-M25). Powered by SUMITOMO's advanced Super Absotech PVD Coating Technology, this grade features a high-adhesion ultra-multilayer AlTiSiN PVD coating over a specialized high-toughness, ultra-fine carbide substrate. It delivers outstanding oxidation resistance at elevated cutting temperatures, suppressing crater wear, work-hardening notch wear, and thermal shock degradation in materials like Inconel 718, Waspaloy, Hastelloy, and Ti-6Al-4V.
Engineered with the medium-heavy EX Chipbreaker Geometry, this insert incorporates a heavy-duty cutting edge with an optimized variable rake angle. The EX breaker delivers reliable chip curling, maintains directional chip evacuation during medium turning and roughing passes, and protects the cutting edge from high-load notch chipping.
2. Key Features
Applies a high-hardness AlTiSiN coating with extraordinary oxidation resistance up to high temperatures, significantly reducing depth-of-cut notch wear on work-hardening alloys.
Utilizes a fine-grained tungsten carbide substrate optimized for high thermal conductivity and edge toughness under heavy mechanical strain.
Combines edge strength with low-heat rake channeling to reliably control tough, ductile HRSA chips without causing premature edge failure.
Double-sided negative 60° triangular format delivers 6 indexable cutting edges per insert for high-value manufacturing productivity.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code for order accuracy:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160408N-EX | TNMG 332-EX |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.187" (3/16") |
| Corner Radius (r) | 0.8 mm | 0.031" (1/32") |
| Hole Diameter (d1) | 3.81 mm | 0.150" |
| Cutting Edge Length (L) | 16.5 mm | 0.650" |
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Nickel Superalloys (Inconel 718, Waspaloy) | 30 - 70 m/min (100 - 230 SFM) | 0.12 - 0.30 mm/rev (.005 - .012 IPR) | 0.8 - 3.5 mm (.031 - .138 in) |
| Titanium Alloys (Ti-6Al-4V, Ti-6242) | 40 - 90 m/min (130 - 295 SFM) | 0.15 - 0.32 mm/rev (.006 - .013 IPR) | 0.8 - 3.5 mm (.031 - .138 in) |
| PH Stainless Steels (17-4PH, 15-5PH) | 90 - 200 m/min (295 - 655 SFM) | 0.15 - 0.35 mm/rev (.006 - .014 IPR) | 1.0 - 4.0 mm (.039 - .157 in) |
Fits all standard ISO/ANSI MTJNR/L, MTGNR/L, or WTJNR/L external turning toolholders and MTFNR/L boring bars taking 1604 / 332 size negative inserts with top and hole clamping.
Browse Compatible Toolholders (MTJNR/L) →4. Target Applications
- Aerospace Turbine & Engine Parts: Precision turning of jet engine turbine disks, casings, and combustor rings made of Inconel 718.
- Oil & Gas Subsea Equipment: Medium-to-heavy turning of corrosion-resistant wellhead valves and shafts in Hastelloy and Duplex stainless.
- Medical & Defense Components: Heavy roughing and turning of structural titanium airframe members and medical forgings.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: Multi-Axis CNC Turning Centers, Heavy Precision Lathes, Vertical Turning Lathes (VTL), and Aerospace Production Lathes.
- Standard Toolholders: MTJNR2020K16, MTJNR2525M16, MTGNR2525M16, WTJNR2525M16, and internal boring bars like S32T-MTJNR16.
- Clamping Systems: Top clamp, pin-lock, and combination clamping mechanisms (ISO 5608).
6. Material & Grade Comparison
| SUMITOMO Grade | Material Class | Primary Application Field | Key Characteristics |
|---|---|---|---|
| AC520U (Current) | High-Toughness Superalloy PVD | ISO S10-S25 / M10-M25 General HRSA & Titanium | Maximum resistance to notch wear and thermal oxidation in superalloys. |
| AC510U | High-Speed Superalloy PVD | ISO S05-S15 / Continuous HRSA Turning | Maximum wear resistance for smooth continuous high-speed HRSA finishing. |
| AC530U | Ultra-Tough Superalloy PVD | ISO S20-S30 / Interrupted HRSA & Heavy Scale | Maximum fracture toughness for heavy interrupted cuts in exotic alloys. |
7. Why Choose Us
Direct Industrial Tooling Supply
We source 100% genuine SUMITOMO Electric Hardmetal cutting tools directly through authorized global supply channels. Every box features original anti-counterfeiting tracking codes. Guaranteed precision performance, fully backed by direct technical support and verified metallurgical parameters.
"AC520U is hands down the best grade we've tested for Inconel 718 turbine forgings. Notch wear at the cut line stopped being an issue."
"Hervorragende Standzeit bei Titan Ti-6Al-4V. Der EX-Spanbrecher erzeugt einen sehr sauberen Spanablauf."
"Eccezionale resistenza all'usura da intaglio su Hastelloy e Inconel. Prodotto assolutamente consigliato."
"Authentic SUMITOMO tooling. Tool life extended dramatically on high-pressure subsea valve turning."
"The EX geometry handles heavy cuts in 17-4PH without chipping. A reliable workhorse insert grade."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: AC520U combines Super Absotech AlTiSiN PVD coating with a ultra-fine tungsten substrate. This construction provides high oxidation resistance and coating adhesion, combating severe heat and work-hardening notch wear typical in Inconel 718.
A: Choose the EX chipbreaker for medium to heavy roughing passes requiring higher depth of cut (ap up to 3.5 mm) or heavier feed rates. Choose the EG chipbreaker for light-to-medium finishing passes requiring lower cutting forces.
A: High-pressure targeted flood coolant (70 bar / 1000 psi or higher) aimed directly at the cutting edge is strongly recommended to control zone temperature, flush chips, and prevent thermal cracking.
A: Yes. TNMG 332-EX is the ANSI imperial designation for the ISO metric code TNMG160408N-EX. Both codes describe an insert with a 3/8" (9.525mm) inscribed circle, 3/16" (4.76mm) thickness, and 1/32" (0.8mm) corner radius.
9. Technical Resource & Troubleshooting Guide
ISO S (Primary): Heat-Resistant Superalloys (Inconel, Waspaloy) & Titanium Alloys ★★★★★
ISO M (Secondary): PH Stainless Steels, Duplex Stainless Steels ★★★★☆
ISO P / K: Conditional / Not Primary Application ★☆☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC520U (Superalloy PVD) | EX |
| Sandvik Coromant | S05F / 1105 / 1115 | SM / MR |
| Iscar | IC806 / IC807 | SM / MS |
| Kennametal | KCS25B / KCU10 | MS / RP |
| Kyocera | PR1125 / PR1325 | SQ / MQ |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Severe Notch Wear at Depth-of-Cut Line | Work-hardening boundary layer of HRSA abrading cutting edge. | Vary the depth of cut across passes or select an entry toolholder with a 45° lead angle. |
| Rapid Crater Wear | Cutting speed (Vc) too high, generating excessive thermal load. | Reduce cutting speed (Vc) by 15-20% while maintaining required feed rate. |
| Cutting Edge Micro-Chipping | Thermal shock cracking from unstable coolant flow. | Ensure continuous, high-pressure coolant or select the tougher AC530U grade. |
| Stringy Unbroken Chips | Feed rate below EX breaker activation range. | Increase feed rate (f) above 0.15 mm/rev to properly engage chip geometry. |
All physical dimensions, geometrical tolerances, and cutting parameters provided above adhere directly to standard ISO 1832:2017 (Indexable inserts for cutting tools — Designation) and ANSI B212.4-2002 specifications. Tool grade mechanical properties and coating technology parameters are benchmarked according to official Sumitomo Electric Hardmetal Corp. technical catalog specifications (AC5000U Series Exotic Superalloy Grade Manual).
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Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
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