EN AW-7475
EN AW-7475High-purity damage-tolerant Al-Zn-Mg-Cu alloy — controlled Fe+Si (<0.22% total) for maximum fracture toughness. T7351: UTS 490-530 MPa with KIc ~33 MPa√m (vs ~26 for 7075-T6). THE alloy for fatigue-critical fuselage skins where crack growth rate matters most. Used for lower wing skins, fuselage skins of wide-body aircraft (Boeing 747/777), and any primary structure requiring damage tolerance.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AA | USA | AA 7475 / UNS A97475 | A97475 | REF |
| 🇪🇺 | EN | Europe | EN AW-7475 / AlZn5.5MgCu | EN AW-7475 | 100% |
Sources: AA, EN 573-3
Mechanical properties — Pro
T7351
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Elastic Modulus | ||
| Density |
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