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Aluminium 7021

Also known as AlZn4.5Mg1, it is a high-strength alloy typically used in applications requiring hardness, toughness and good resistance to wear and corrosion.

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Aluminium 7021 CNC machining


  • High Strength
  • Good Wear Resistance
  • Dimensional Stability
  • High Heat Transfer


  • Limited Weldability
  • Reduced Formability


  • Machining process: CNC Machining
  • Tolerances: ISO 2768-1 fine (f) or medium (m) class. Info
  • Max size: 500x500x400 mm ; 19.7x19.7x15.7 in
  • Lead time: <4 days
certificate ISO 9001:2015
HP-certified 1

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4.81 / 5 from 281 reviews



High Strength

Aluminium 7021 is a high-strength alloy suitable for components that must withstand high stresses or loads. The unique combination of alloying elements in Aluminium 7021, including zinc, magnesium and copper, creates a robust material that can withstand harsh environments, increasing the longevity of the final part.


Good Wear Resistance

The hardness of the alloy helps to reduce the risk of surface degradation, wear and tear, making it ideal for parts that are subject to friction or abrasion in their operating environment.


High Heat Transfer

Aluminium 7021 has a superior thermal conductivity, making it an excellent choice for applications requiring rapid heat dissipation. This can be particularly advantageous for engine or machinery parts that generate a significant amount of heat and where efficient heat transfer can prevent overheating and optimize performance.



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Aluminium 7021 offers a number of unique properties that can be advantageous for a number of applications. If you understand these attributes and align them with your project requirements, you can get the most out of what this unique alloy has to offer.




• High Strength

One of the defining characteristics of Aluminum 7021 is its impressive mechanical strength. This metal alloy, due to its distinctive mix of alloying elements such as zinc, copper, and magnesium, results in a material that is exceptionally strong and durable. This strength can provide added durability and lifespan to the final component, particularly in applications that need to endure high levels of stress or heavy loads.


• Good Wear Resistance

The hardness of Aluminium 7021 makes it a robust choice with high wear resistance. Components made with this alloy are less liable to degrade, making it suitable for applications involving high levels of abrasion or friction. This can lead to a longer life of mechanical parts and potential cost savings in the long run.


• Dimensional Stability

Aluminium 7021 has a low coefficient of thermal expansion, ensuring excellent dimensional stability. Parts made with this material resist changes in size or shape under varying temperature conditions. This quality is very advantageous in areas where operations take place in unpredictable or extreme temperature scenarios.


• High Heat Transfer

Aluminium 7021 thermal conductivity is superior to that of many other materials, making it ideal for parts that require fast and efficient heat dissipation. This attribute is particularly useful in heat-generating machinery or engine parts, where efficient heat transfer can prevent overheating and ensure optimal performance.




• Limited Weldability

Not all aluminum alloys are created equal when it comes to welding. Despite its many strengths, Aluminum 7021 falls short in this regard, with limited weldability compared to other aluminum alloys. This can pose a challenge for projects that require extensive welding, limiting the design and assembly options.


• Reduced Formability

Aluminum 7021 has a lower formability compared to other aluminum alloys. This means it might not be as easy to bend, shape, or work into complex geometries, potentially restricting the scope of design options. However, it is important to keep in mind that its high strength and wear resistance can often overcome this limitation, depending on the specific application.





Aluminum 7021 vs. 6082

Aluminium 6082, also known as "structural alloy", has a similar composition to 7021, but is more commonly used in Europe. While 7021 is known for its greater mechanical strength and dimensional stability, 6082 offers good corrosion resistance, weldability and formability. However, in applications requiring higher strength, 7021 may be the better choice.


Aluminum 7021 vs. 7075

Aluminium 7075 is one of the highest strength aluminium alloys available, even exceeding the strength of 7021. It is often used in applications requiring a high strength-to-weight ratio, such as aircraft structures. However, 7075 is less resistant to corrosion than 7021 and its weldability is poorer.


Aluminum 7021 vs. 5083

Aluminium 5083 is a high-quality aluminium alloy known for its outstanding performance in extreme environments, with excellent resistance to seawater attack and industrial chemicals. Although 5083 is highly resistant to corrosion, its strength is not equal to that of 7021. If the application requires greater mechanical strength, 7021 may be a better choice.


Aluminum 7021 vs. 2011

Aluminium 2011, often used for screw machine products, is not as strong as 7021 but has excellent machinability. Although 2011 can be useful for detailed and intricate parts, it is not suitable for high-load or high-stress applications, where 7021 excels.


In conclusion, Aluminium 7021, with its superior mechanical strength, wear resistance and dimensional stability, is able to compete with other aluminium alloys. However, depending on the application and specific requirements, you might prefer 6082 for its corrosion resistance, 7075 for its extreme strength, 5083 for its performance in harsh environments or 2011 for its machinability. By understanding the characteristics of each alloy, you will be able to make the most conscious decision based on your project requirements.


Best applications:

The properties of Aluminum 7021 make it ideal for a variety of applications across many industries. Here are some of the key areas where this aluminum alloy shines.


Transportation and Automotive Industries

Thanks to its excellent strength-to-weight ratio, Aluminium 7021 is often used in the production of vehicle parts. From bus and truck bodies to railway car components, this alloy offers lightweight yet durable solutions that can withstand everyday wear and tear.



The superior mechanical strength and wear resistance of Aluminium 7021 make it a suitable choice for various components in the aerospace industry. It can be used in the production of parts such as fittings and couplings, bulkheads and even some types of aircraft wings.



Although other aluminium alloys, such as 5083, may offer better corrosion resistance in marine environments, the high strength and wear resistance of 7021 may find application in parts where these characteristics are a priority, such as structural components of ships.


Machinery and Equipment

In the manufacturing sector, the durability and strength of Aluminium 7021 are advantageous for creating parts and equipment that can withstand high-stress operations. This can include everything from high-performance machinery parts to structural components.



In conclusion, Aluminium 7021 is a popular material choice in various industries due to its impressive mechanical strength, wear resistance and superior dimensional stability. Although this alloy is not as common as its counterparts such as 6082 or 7075, it definitely excels when it comes to delivering high performance under harsh conditions.

It is essential to remember that the value of Aluminium 7021 derives not only from its autonomous qualities, but also from the way these qualities are exploited in specific applications. It is this application-oriented value that has allowed Aluminium 7021 to cut a niche for itself, particularly in sectors where strength, durability and resilience are critical.

However, as with any engineering decision, the choice of Aluminium 7021 must be the result of a comprehensive evaluation of the specific requirements of the project. While this alloy may be perfectly suited for one application, other materials may outperform it under different conditions or requirements. For this reason, it is always advisable to consult materials specialists or use resources such as our material comparison guide to ensure you make the most informed choice for your project.

"★★★★★ As a designer, I opted for Aluminium 7021 parts made by Weerg for my project. I was impressed by the superior mechanical strength and dimensional stability of Aluminium 7021. The precision and finish of Weerg work were second to none. The support from the Weerg team was exceptional, with quick responses and valuable advice. I highly recommend Aluminium 7021 and Weerg!"


Tensile breaking load 460 MPa
Modulus of elasticity 96 GPa
Elongation at break 9,4 %
Density 2,9 g/cm³
Melting temperature 630°C
Hardness 120 HB
Yield strength 390 MPa




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