Specify the alloy and temper
Aluminum grades have different strength, corrosion, weight, finishing and machining characteristics. State the exact alloy and temper where specified. If material selection is open, describe the application and performance requirements rather than assuming all aluminum behaves the same way.
Geometry affects stability
Thin walls, deep pockets, long tools, tight internal radii and interrupted sections can affect distortion, tool access and cycle time. Identify functional faces, mating features and dimensions that must be controlled relative to one another.
Control the finished condition
Anodizing, plating, coating and other treatments can influence appearance and dimensions. The drawing should state the finish type, cosmetic surfaces, acceptable variation, masking areas and any dimensions that apply after finishing.
Plan prototypes and repeat production
Provide both the initial order quantity and expected follow-on volume. This helps align material sourcing, fixturing, inspection frequency and packaging with the actual program.