AA 7475 Aluminium Plates – High-Toughness 7475-T7351 / T7651 Aerospace Plate
ASC LLP, Mumbai, supplies AA 7475 aluminium plates (UNS A97475) in T651, T7651 and T7351 tempers, with mill certificates to the ordered AMS or customer specification. See also our full range of aluminium alloy plates.
What is AA 7475 Aluminium?
AA 7475 is a high-strength Al-Zn-Mg-Cu alloy developed from 7075 for fracture-critical aircraft structure. Its iron and silicon are held to very low levels, and processing is tightly controlled. As a result, 7475 plate offers roughly 40% higher fracture toughness than 7075 in the same temper, together with better resistance to fatigue crack growth.
The strength is similar to 7075; therefore, designers choose 7475 where damage tolerance matters, such as wing skins, spars and fuselage bulkheads.
AA 7475 Plate – Quick Facts
- Alloy: AA 7475, UNS A97475, EN AW-7475
- Key feature: Fe 0.12% max and Si 0.10% max, which raises toughness
- Plate tempers: T651, T7651 and T7351; in addition, T61 / T761 for sheet
- Specifications: AMS 4202 (T7351), AMS 4089 (T7651) and AMS 4090 (T651)
- Strength (T651): about 570 MPa tensile, while yield is about 500 MPa
- Joining: machined and fastened, because it is not suitable for fusion welding
Key Properties of 7475 Aluminium Plate
- Fracture toughness: higher than 7075, because fewer iron and silicon particles start cracks.
- Fatigue performance: slower crack growth, so inspection intervals on aircraft can be longer.
- High strength: similar to 7075 in the T651 temper.
- Corrosion behaviour: T73 and T76 tempers resist stress corrosion and exfoliation; however, T651 is more susceptible.
- Machinability: good in all tempers, especially for large integrally machined parts.
AA 7475 Tempers – T651, T7651, T7351
| Temper | Treatment | Main benefit |
| T651 | Solution treated, stretched and peak aged | Highest strength, so it suits compression parts |
| T7651 | Stretched and overaged | Exfoliation resistance, with good strength |
| T7351 | Stretched and further overaged | Best stress-corrosion resistance, at slightly lower strength |
| T61 / T761 | Sheet tempers | Thin skins, as well as formed parts |
Overaging trades a little strength for much better corrosion behaviour. Consequently, T7351 is specified for parts under sustained stress, whereas T651 is used where maximum strength is needed.
AA 7475 Plate Sizes
| Thickness (mm) | Typical tempers | Typical size (mm) |
| 6 – 25 | T651, T7651, T7351 | typically 1220 × 2440 to 1500 × 4000 |
| 25 – 75 | T7651, T7351 | 1500 × 3000 to 2000 × 6000 |
| 75 – 150 | T7351, as well as T7651 | as per mill range |
Availability depends on mill schedules; therefore, sizes and tempers are confirmed with each quotation. In addition, plates can be saw cut to blanks.
AA 7475 Mechanical Properties by Temper
| Temper | Tensile (MPa) | Yield (MPa) | Elongation (%) |
| T651 (typical) | about 570 | about 500 | about 10 |
| T7651 (typical) | about 540 | about 460 | about 11 |
| T7351 (typical) | about 495 | about 425 | about 13 |
These are typical values for medium-thickness plate. Minimum values, by contrast, depend on thickness and the AMS specification ordered, so the mill certificate is the reference.
AA 7475 Plate Specifications
| Item | Details |
| Alloy | AA 7475, UNS A97475, EN AW-7475 |
| Plate specifications | AMS 4202 (T7351), AMS 4089 (T7651), AMS 4090 (T651) |
| Customer specifications | BAMS, DMS and similar, as specified by the airframe maker |
| Tempers | T651, T7651, T7351; in addition, T61 / T761 sheet |
| Testing | Tensile and conductivity, as well as UT; in addition, fracture toughness per specification |
| Certificate | Mill certificate (EN 10204 3.1 equivalent) with full traceability |
AA 7475 Chemical Composition
| Element | AA 7475 (%) |
| Zinc (Zn) | 5.2 – 6.2, the main strengthener |
| Magnesium (Mg) | 1.9 – 2.6 |
| Copper (Cu) | 1.2 – 1.9 |
| Chromium (Cr) | 0.18 – 0.25 |
| Iron (Fe) | 0.12 max, which is the key limit |
| Silicon (Si) | similarly, 0.10 max |
| Manganese (Mn) | however, 0.06 max |
| Titanium (Ti) | also 0.06 max |
| Others, each / total | 0.05 / 0.15 max |
| Aluminium (Al) | Balance |
The main alloying elements match 7075. In contrast, 7475 limits iron to 0.12% and silicon to 0.10%, compared with 0.50% and 0.40% in 7075, which is the reason for its higher toughness.
7475 vs 7075 vs 7050 vs 2024
| Alloy | Main strength | Toughness | Typical use |
| 7075 | Very high | Moderate | General high-strength parts, at lower cost |
| 7475 | Very high | High | Fracture-critical skins and spars |
| 7050 | Very high | High, especially in thick plate | Thick bulkheads and frames |
| 2024 | High | Good damage tolerance | Lower wing skins and fuselage |
Applications of AA 7475 Aluminium Plates
| Industry | Typical 7475 plate use |
| Commercial aircraft | Wing skins and spars, as well as fuselage bulkheads |
| Military aircraft | Fracture-critical frames, as well as wing structure |
| Space & defence | Highly stressed structural parts, for example launch structures |
| Precision engineering | High-strength machined parts, especially where toughness matters |
Machining & Joining 7475
7475 machines well and is normally joined with fasteners or adhesive bonding. However, like other copper-bearing 7xxx alloys, it is not recommended for fusion welding, because the weld zone cracks and loses strength. For marine or welded structures, 5xxx or 6xxx alloys are used instead.
Why Buy AA 7475 Plates from ASC LLP?
- Traceable material: mill certificates to the AMS or customer specification ordered.
- Correct temper advice: help choosing T651, T7651 or T7351, because strength and corrosion needs decide the temper.
- Cut blanks: plates saw cut to size, so less material is wasted.
- Export packing: finally, plates are interleaved and crated.
See also our full aluminium and aluminium alloys range.
Frequently Asked Questions – AA 7475 Aluminium Plates
What is AA 7475 aluminium?
In short, it is a high-strength Al-Zn-Mg-Cu alloy derived from 7075, with low iron and silicon for higher fracture toughness.
What is the difference between 7475 and 7075?
Both have similar strength. However, 7475 limits Fe to 0.12% and Si to 0.10%, which gives about 40% higher toughness.
What tempers are available for 7475 plate?
Plate is mainly supplied as T651, T7651 and T7351, while sheet is supplied as T61 or T761.
What specification covers 7475-T7351 plate?
AMS 4202 covers 7475-T7351 plate; in addition, AMS 4089 covers T7651 and AMS 4090 covers T651.
Can 7475 aluminium be welded?
It is not recommended for fusion welding. Instead, parts are machined and joined with fasteners.
What is the tensile strength of 7475-T651?
Typically about 570 MPa tensile and 500 MPa yield. Minimum values depend on thickness and specification.
Where is 7475 aluminium plate used?
Mainly in aircraft wing skins, spars, fuselage bulkheads and other fracture-critical parts.
Global Supply
ASC LLP supplies AA 7475 aluminium plates from Mumbai to customers in India, the Middle East, Europe, Africa, the Americas and South-East Asia. To get a prompt quotation, simply send your enquiry with thickness, size, temper, specification and quantity.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
