Aluminium can suit machinery components, but selection depends on loading, manufacturing and joining. Assess the complete application.
Review the specific alloy
Aluminium is not a single uniform material. Strength, machinability and other properties depend on alloy and condition. Base selection on approved material data and design requirements.
Plan joints and surfaces
Threads, fasteners and contact with other materials must suit the component. Surface treatment and environmental conditions may also matter. Resolve these questions before manufacture rather than discovering them during assembly.
Check function in the assembly
Low component weight does not establish overall system performance. Review stiffness, interfaces and intended use together. Replacement parts should match the documented original material and dimensions.