“Aluminum” is a starting point, not a complete material specification. Alloy and temper affect strength, machinability, corrosion behavior, anodized appearance, and stock availability. Choose from the part’s job rather than from a familiar grade alone.
Begin with the operating requirements
List loads, temperature, exposure to moisture or chemicals, weight targets, and any surface treatment. Also note whether the part needs threads, thin walls, or a visible cosmetic finish. These requirements narrow the options more effectively than a generic request for “strong aluminum.”
Compare common choices
6061 is widely used for machined structures and housings because it balances strength, workability, and finish options. 7075 can be considered where higher strength is important, but it may be less attractive for some corrosion environments and finishes. Other alloys can make sense for specific forming or conductivity needs.
Check availability and finish together
Stock form and size can affect lead time and waste. Anodizing can change color and dimensions, especially on close fits. If appearance matters, agree on an acceptable finish sample or written criteria before the production order.
Before you request a quote
Provide the preferred alloy and temper if known. If not, describe the function, environment, and finish so the material discussion can happen before price is fixed.
6061, 6082 and 7075: start with the application
6061 is a common starting point for housings and general structural components. 6082 is another structural-alloy option to discuss where strength, stock form and local supply matter. 7075 may be considered for demanding strength requirements, but should not replace another alloy without checking the complete service environment, joining approach and finish.
Include the material condition
A grade alone is incomplete. Identify temper, stock form, certificate requirements and whether a proposed equivalent needs approval. For cosmetic anodizing, discuss appearance expectations rather than assuming every alloy gives the same visual result.
Design and finish interact
Deep pockets and thin walls can influence workholding and distortion. Anodizing affects dimensions and appearance; specify which fits need masking or allowance. A higher-strength alloy does not automatically solve a stiffness or geometry problem. Review the load path and assembly interfaces with the designer.