Posted August 27, 2019

    Aluminum Comparison: 6061 vs. 7075

    aluminum blocks ready for machiningLightweight, strong, durable, and widely available, aluminum is perfect for a range of industrial and commercial applications from aircraft to iPhones. Aluminum comes in a variety of alloys, with 6061 and 7075 being the most common for mechanical applications. Let's take a closer look at what each has to offer.



    • Contains magnesium and silicon
    • Good all-around choice for heat-treatability, weldabilitiy, and forming
    • Excellent corrosion resistance, better than 7075
    • Used in food and drink packaging
    • Regularly used in small aircraft, boats
    • Extremely versatile
    • Great for secondary operations like anodizing.
    • Strong, but not quite as strong as 7075
    • Contains zinc and a small amount of magnesium
    • Strong, with a higher strength-to-weight ratio than 6061
    • Able to match steel in terms of strength
    • Decent corrosion resistance, but not as good as 6061
    • Heavier than 6061, though still highly machinable
    • Used in aircraft, industrial tooling, sporting equipment
    • Low density with good thermal properties
    • Produces a smooth material finish


    So, which is best? That depends on your use case. But to sum it all up:

    Aluminum 6061: Cost effective, medium strength, easy to work with.

    Aluminum 7075: Exceptionally strong with typically smoother finishes.


    One more thing! Here's a version you can print out for future reference: 

    Download Chart


    Topics: materials, Manufacturing