7475 is a controlled purity version of 7075. Reducing iron and silicon cuts the coarse intermetallic particles that initiate cracks, which raises fracture toughness substantially at comparable strength levels.
It is specified for fracture critical structure where damage tolerance analysis drives the design, typically as plate and sheet in T61, T651, T761 and T7351 tempers.
Stocked as plate and sheet with cut blanks available.
Sizes and stock
- Bar and rod 0.250" through 16" diameter
- Plate 0.250" through 12", sheet from 0.016"
- Standard and custom extruded profiles to your die print
- Tube, pipe and coil in common tempers
Processing capabilities
- Custom extrusions and profiles from your die print
- Solution treat, age and anneal to T-temper
- Waterjet, saw and CNC machined blanks
- Anodizing, chemical milling and surface finishing
Specifications
Material is released to the applicable specification with mill test reports and, on request, independent lab verification.
Why engineers specify 7475
- Substantially higher fracture toughness than 7075 at similar strength
- Controlled iron and silicon for a clean microstructure
- Available in both peak and overaged tempers
- Specified on damage tolerant airframe structure
Nominal chemistry
Percent by weight, nominal composition per the governing specification. The mill test report for your heat is the controlling document.
Typical mechanical properties
| Condition | Tensile strength | Yield strength | Elongation | Hardness |
|---|---|---|---|---|
| T651 plate | 76 ksi min | 67 ksi min | 7% min | - |
| T7351 plate | 68 ksi min | 58 ksi min | 8% min | - |
Typical published values for reference only, not for design. Properties vary with section size, product form and processing. Order to the specification and condition your drawing requires.
Typical applications
- Fracture critical wing and fuselage structure
- Bulkheads and frames
- Damage tolerant plate parts
Fabrication notes
Machining
Machines rapidly with sharp, polished, high rake tooling and high surface speeds. Heat treatable alloys cut cleanest in the T temper. Thick plate benefits from stress relieved tempers to limit movement when large volumes of material are removed.
Welding
Weldability varies by series. The 5xxx and 6xxx alloys weld readily with 4043 or 5356 filler; the 2xxx and 7xxx aerospace alloys are normally joined mechanically or by friction stir and specialized processes rather than fusion welding.
Forming
Form in the annealed or freshly solution treated condition where the temper allows, then age to final strength. Bend radii should follow the temper and thickness in the governing specification.
7475 compared with similar grades
7075
Lower cost, lower toughness at the same strength.
7050
Better in very thick sections; 7475 leads on toughness in sheet and moderate plate.
Designations and cross reference
- Material family
- Aluminum Alloys
- EN designation
- EN AW-7475 / AlZn5.5MgCu(A)
Working from an obsolete, foreign or superseded designation? Send it over and we will cross reference it to a current grade and specification.
Quality, testing and traceability
Supplied with mill test reports, temper verification, and ultrasonic inspection, conductivity, hardness and mechanical testing available on request.
We are AS9100D and ISO 9001:2015 registered. If our stock does not already carry the inspection your specification requires, we can quote the material with that work performed. More on our quality system
Available forms
7475 frequently asked questions
What is 7475?
7475 is a controlled purity version of 7075. Reducing iron and silicon cuts the coarse intermetallic particles that initiate cracks, which raises fracture toughness substantially at comparable strength levels.
What forms is 7475 available in?
We supply 7475 in bar, billet, casting, extrusion, fitting, flange, foil, forging, pipe, plate, profile, rod, sheet, strip, tube, wire. Custom sizes are converted from billet, and we can provide saw cut, waterjet or near net blanks so material arrives closer to your finished part.
What is the UNS or equivalent designation for 7475?
7475 is designated EN EN AW-7475 / AlZn5.5MgCu(A). If your drawing calls out an obsolete or foreign designation we can cross reference it and confirm the equivalent before you order.
What specifications can 7475 be supplied to?
Commonly ordered specifications include AMS 4100, AMS 4202, QQA-200/1. Material is released to the specification and condition on your purchase order, with mill test reports supplied as standard.
What conditions can 7475 be ordered in?
We can supply T651 plate, T7351 plate. If our stock is not already in the condition you need, we can quote it with the heat treatment performed before shipment.
Can you cut 7475 to size?
Yes. Saw cutting, waterjet, laser and shearing are available, along with trepanning, gun drilling, lathe turning and CNC machining, so you can order blanks or rough machined pieces rather than full lengths.
Do you provide test reports and additional testing on 7475?
Every order ships with mill test reports and heat traceability. If your print calls for ultrasonic inspection, penetrant dye, magnetic particle, chemical assay, micrography, hardness or mechanical testing and our stock does not already carry it, we can quote the material with that work performed.
Can 7475 be supplied to DFARS domestic melt requirements?
Tell us at quote stage if the order is DFARS or domestic melt restricted and we will confirm availability against that requirement before you commit.
What do you need to quote 7475?
Grade, form, dimensions, quantity, specification and condition, plus any testing or certification requirements and the date you need it. Send a drawing if you have one. Quotes are typically ready within 24 hours.
How does 7475 compare with 7075?
Lower cost, lower toughness at the same strength.