What is NADCAP Certification and Why It Matters for Aerospace Aluminum
If you are sourcing aluminum raw materials for an aerospace structural application, you have probably come across both 7075 and 2024. They are the two most widely used high-strength aluminum alloys in the aerospace industry, and for good reason — both offer excellent strength-to-weight ratios and are well proven in aircraft and defense applications.
But they are not interchangeable. Each has distinct strengths, and choosing the wrong one can create problems in manufacturing or in service. Here is a practical comparison to help you decide.
Feature | 2024 Aluminum | 7075 Aluminum |
Description | 2024 is a copper-based aluminum alloy (Al-Cu-Mg) developed specifically for aerospace applications. | 7075 is a zinc-based alloy (Al-Zn-Mg-Cu) that is one of the highest-strength aluminum alloys commercially available. |
Primary Advantage | Its primary advantage is excellent fatigue resistance — the ability to withstand repeated loading and unloading cycles without crack initiation. | In the T6 condition, it approaches the strength of some mild steels while remaining much lighter. |
Applications | This makes it the preferred choice for airframe structures, wing skins, and fuselage components that experience cyclic stress during flight. | It is widely used in airframe structures, ejector seat components, and defense applications where maximum static strength is the primary requirement. |
Common Tempers | T3, T4, T351, T851 | T3, T4, T351, T851 |