7075-T6
Peak-aged. Normal for sheet up to about 6 mm. Maximum strength.
High-strength aerospace plate
7075 T6, T651 and T7351 Aluminium Sheet and Plate
7075 is the classic high-strength aluminium alloy: in T6 and T651 it reaches about 570 MPa tensile strength, close to many structural steels at one third of the weight. It machines superbly but is not suited to fusion welding, and the over-aged T7351 temper is used where stress-corrosion resistance matters. Metline supplies 7075 sheet and plate in T6, T651 and T7351, certified to ASTM, AMS and EN, worldwide.
- Alloy
- 7075 (Al-Zn-Mg-Cu)
- Tempers
- O, T6, T651, T7351
- Thickness
- 0.5 – 200 mm
- Specs
- ASTM B209 · AMS 4045 · AMS 4078
What is 7075 aluminium plate?
7075 combines about 5.6 % zinc, 2.5 % magnesium and 1.6 % copper, with chromium for grain control. After solution treatment and ageing, fine zinc-magnesium precipitates give it one of the highest strengths of any commercial aluminium alloy.
Introduced in the 1940s for aircraft structure, 7075 is still used for wing and fuselage fittings, but today much of its plate goes into moulds, tooling, jigs, high-performance sports goods and precision machined parts, because it machines cleanly and holds tight tolerances.
Its limits are just as important: it is not weldable by conventional fusion processes, its corrosion resistance is lower than 5xxx and 6xxx alloys, and peak-aged T6 can be sensitive to stress corrosion in the short-transverse direction. The T73 family of tempers addresses that last point at the cost of about 10 – 15 % strength.
7075 chemical composition (wt %)
| Element | Minimum | Maximum |
|---|---|---|
| Zinc (Zn) | 5.1 | 6.1 |
| Magnesium (Mg) | 2.1 | 2.9 |
| Copper (Cu) | 1.2 | 2.0 |
| Chromium (Cr) | 0.18 | 0.28 |
| Silicon (Si) | — | 0.40 |
| Iron (Fe) | — | 0.50 |
| Manganese (Mn) | — | 0.30 |
| Titanium (Ti) | — | 0.20 |
| Others, each / total | — | 0.05 / 0.15 |
| Aluminium (Al) | Remainder |
7075 mechanical and physical properties
Typical values for comparison. Specified minimums in ASTM B209, AMS 4045 and AMS 4078 fall with thickness and differ by test direction; design to those values.
| Temper | Tensile strength | Yield strength (0.2 %) | Elongation | Hardness |
|---|---|---|---|---|
| O | 228 MPa | 103 MPa | about 17 % | 60 HB |
| T6 / T651 | 572 MPa | 503 MPa | about 11 % | 150 HB |
| T73 / T7351 | 505 MPa | 435 MPa | about 13 % | about 135 HB |
Physical properties (T6)
- Density
- 2.81 g/cm³
- Modulus of elasticity
- 71.7 GPa
- Fatigue strength (5×10⁸ cycles)
- about 160 MPa
- Thermal conductivity
- about 130 W/m·K
- Electrical conductivity
- about 33 % IACS
- Coefficient of thermal expansion
- 23.6 µm/m·°C
- Melting range
- about 477 – 635 °C
7075-T6 vs T651 vs T7351
7075-T651
Peak-aged and stretched to relieve stress. Standard for plate that will be machined: moulds, tooling, fittings.
7075-T7351
Stretched and over-aged. About 12 % lower strength than T651 but far better resistance to stress corrosion cracking; specified for aerospace fittings under sustained load.
7075-O
Annealed for forming; heat-treat to T6 afterwards.
7075 standards and equivalents
| System | Designation | Standard |
|---|---|---|
| ASTM | 7075 | ASTM B209 (sheet and plate) |
| SAE AMS | 7075-T6 / T651 | AMS 4045; AMS-QQ-A-250/12 |
| SAE AMS | 7075-T7351 | AMS 4078 |
| UNS | A97075 | — |
| European (EN) | EN AW-7075 / AlZn5.5MgCu | EN 485, EN 573-3 |
| German Werkstoff | 3.4365 | — |
| Japan (JIS) | A7075P | JIS H4000 |
| China (GB) | 7075 | GB/T 3880 |
7075 sizes and weights
Supply range
- Sheet
- 0.5 – 6 mm, T6 (bare or Alclad on request)
- Plate
- 6 – 200 mm, T651 or T7351
- Width × length
- 1220 × 2440, 1250 × 2500, 1500 × 3000 mm; cut-to-size blocks
- Inspection
- Ultrasonic testing to AMS-STD-2154 on request
| Thickness (mm) | kg per m² | 1250 × 2500 mm (kg) | 1500 × 3000 mm (kg) |
|---|---|---|---|
| 1 | 2.81 | 8.8 | 12.6 |
| 2 | 5.62 | 17.6 | 25.3 |
| 3 | 8.43 | 26.3 | 37.9 |
| 4 | 11.24 | 35.1 | 50.6 |
| 5 | 14.05 | 43.9 | 63.2 |
| 6 | 16.86 | 52.7 | 75.9 |
| 8 | 22.48 | 70.2 | 101.2 |
| 10 | 28.10 | 87.8 | 126.5 |
| 12 | 33.72 | 105.4 | 151.7 |
| 16 | 44.96 | 140.5 | 202.3 |
| 20 | 56.20 | 175.6 | 252.9 |
| 25 | 70.25 | 219.5 | 316.1 |
| 30 | 84.30 | 263.4 | 379.3 |
| 40 | 112.40 | 351.2 | 505.8 |
| 50 | 140.50 | 439.1 | 632.2 |
| 60 | 168.60 | 526.9 | 758.7 |
| 80 | 224.80 | 702.5 | 1011.6 |
| 100 | 281.00 | 878.1 | 1264.5 |
Machining, joining and finishing
Machining
Excellent: short chips, fine finish and tight tolerances. T651 stays flat when heavily machined.
Welding
Not recommended for fusion welding: welds crack and lose strength. Join by fastening, adhesive bonding or friction-stir welding.
Corrosion
Fair. Protect with anodising, chromate-free conversion coatings or paint; use T7351 where stress corrosion is a risk.
Anodising
Hard and protective anodising both work well; colour is slightly darker than 6061.
Where 7075 plate is used
- Aerospace: wing and fuselage fittings, frames, ribs and landing-gear parts
- Tooling: blow moulds, injection moulds, jigs and fixtures
- Defence: high-strength machined components
- Sport: climbing hardware, bicycle components and firearms parts
- Industry: high-load gears, shafts and robot arms machined from plate
7075 vs 6061 vs 2024
| Property | 6061-T651 | 2024-T351 | 7075-T651 |
|---|---|---|---|
| Typical tensile strength | 310 MPa | 470 MPa | 572 MPa |
| Typical yield strength | 276 MPa | 325 MPa | 503 MPa |
| Fatigue performance | Good | Very good | Good |
| Weldability | Good | Poor | Poor |
| Corrosion resistance | Good | Poor | Fair |
More detail: 6061 vs 7075 and 2024 vs 7075.
How to order 7075 plate
- SpecifyAlloy and temper (for example 7075-T651, 30 × 1250 × 2500 mm), thickness, width and length or a drawing, quantity, and the governing standard (ASTM B209, AMS 4045 / 4078 or EN 485).
- QuoteWe confirm availability, tolerances, certification and delivery terms (EXW, FOB, CIF or DAP) for your destination.
- ProcessPlate is saw-cut or waterjet-cut to size where required, film-protected on request and inspected for dimensions and surface.
- DocumentEach shipment carries a mill test certificate to EN 10204 3.1 with chemistry and mechanical results, plus the packing list; third-party inspection can be arranged.
- ShipSeaworthy wooden cases or fumigated pallets, dispatched by sea or air to your port or door.
References and standards
- ASTM B209 – Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
- SAE AMS 4045 – Aluminum Alloy Sheet and Plate, 7075-T6 / T651
- SAE AMS 4078 – Aluminum Alloy Plate, 7075-T7351
- EN 573-3 – Chemical composition and form of wrought products
- The Aluminum Association – International Alloy Designations and Chemical Composition Limits
7075 aluminium (aluminum) plate: FAQ
What is the difference between 7075-T6 and T651?
Same strength; T651 plate is stretched after quenching to relieve stress, so it stays flat when machined.
When should I use 7075-T7351?
When the part carries sustained tensile load in a corrosive environment, especially across the short-transverse direction. T7351 resists stress corrosion cracking far better than T651.
Can 7075 be welded?
Not reliably by MIG or TIG; welds crack and lose strength. Use mechanical fastening or friction-stir welding.
How strong is 7075 compared with steel?
7075-T6 has a typical tensile strength of about 572 MPa, comparable with many structural steels, at about one third of the density.
What does 7075 plate weigh?
2.81 kg per m² per millimetre. A 1250 × 2500 × 20 mm plate weighs about 176 kg.
Need 7075 plate?
Send the temper, thickness, size, quantity and specification. We will confirm availability, certification and a delivered price.
