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
Chemical composition comparison (wt%)
Side-by-side: EN AW-7475 (EN 573-3) vs EN AW-7475 / AlZn5.5MgCu (EN) (EN 573-3)
| Element | EN AW-7475 (EN 573-3) | EN AW-7475 / AlZn5.5MgCu (EN) | Overlap |
|---|---|---|---|
| Si | — | 0–0.1% | — |
| Cr | — | 0.18–0.25% | — |
Mechanical properties
Compatibility verdict
EN AW-7475 and EN AW-7475 / AlZn5.5MgCu: 100% composition match
Related materials
EN AW-6082
3.2315High-strength structural aluminium alloy in the Al-Mg-Si family. One of the strongest 6xxx series alloys due to manganese addition. Replaced 6061 in many European applications. Used for trusses, bridges, cranes, transport, scaffolding, and marine applications. Heat treatable (T6/T651).
EN AW-5083
3.3547The highest-strength non-heat-treatable aluminium alloy. Excellent corrosion resistance (especially seawater), good weldability. Standard alloy for shipbuilding, offshore, pressure vessels, cryogenic applications, and armour plate. Not for continuous service above 65°C under stress (SCC risk).
EN AW-7075
3.4365The classic high-strength aerospace aluminium alloy. Al-Zn-Mg-Cu composition provides the highest strength of all common aluminium alloys in T6 temper. Poor weldability and limited corrosion resistance. Used for aircraft structures, M16 rifle receivers, rock climbing gear, and precision mold plates.
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