Low Density
Aluminum is often reviewed when lower component weight matters. It can help reduce part mass without moving directly to plastic or magnesium.
ALUMINUM MATERIAL GUIDE
Aluminum Material Guide for Custom Manufacturing
Aluminum is widely used for custom manufactured parts because it combines low weight, machinability, corrosion resistance and a broad range of alloy options. This guide explains how common aluminum alloys differ, which manufacturing processes they suit, and what engineers and buyers should review before selecting an alloy for a project.
MATERIAL OVERVIEW
Why Is Aluminum Widely Used for Manufactured Parts?
Aluminum can be useful across many custom component projects, but the right alloy and process still depend on part geometry, function and production requirements.
Good Machinability
Many aluminum alloys machine efficiently compared with harder metals. Final machinability still depends on alloy, geometry and feature requirements.
Corrosion Resistance
Aluminum forms a natural oxide layer and can be paired with finishing routes when appearance or additional surface protection is needed.
Thermal Conductivity
Aluminum is commonly reviewed for heat sinks, housings and thermal paths where heat transfer is part of the component function.
Surface Finishing Options
Anodizing, powder coating, painting and mechanical finishing may be reviewed depending on alloy, appearance and functional needs.
Multiple Manufacturing Routes
Aluminum can be machined, die cast, formed or finished through different routes, depending on geometry and production requirements.
COMMON ALUMINUM ALLOYS
Common Aluminum Alloys for Custom Manufacturing
These alloys are listed as practical manufacturing references. Final availability and suitability should be reviewed according to drawings, process route and project requirements.
| Alloy | Typical Manufacturing Route | General Characteristics | Common Applications / Part Types |
|---|---|---|---|
| 6061 | CNC machining / extrusion-related manufacturing | Balanced machinability, strength and corrosion resistance. | Housings, brackets and machined components. |
| 6082 | CNC machining / structural applications | Structural strength and machinability for mechanical parts. | Plates, frames and mechanical components. |
| 7075 | CNC machining | Higher-strength wrought aluminum reference for demanding mechanical applications. | Higher-load machined components. |
| 5052 | Sheet / forming | Formability and corrosion resistance as a common industry reference. | Covers, panels and formed components. |
| ADC12 | Die casting | Common die-casting reference for complex cast geometry and housing features. | Housings, enclosures and cast structural parts. |
| A380 | Die casting | Common die-casting reference for production housings and structural cast components. | General production die cast housings and structural parts. |
The alloys shown are common industry references. Final material availability and manufacturing suitability should be confirmed for the specific project.
ALUMINUM FORMS
Wrought Aluminum vs Cast Aluminum
The same material family can lead to different process choices. Wrought and cast aluminum are reviewed differently because their starting form, geometry and production route are different.
Wrought Aluminum
Wrought alloys are produced into forms such as plate, bar, sheet or extrusion before the final component is machined or formed.
- 6061
- 6082
- 7075
- 5052
- Plate
- Bar
- Sheet
- Extrusion
- CNC Machining
- Forming
Cast Aluminum
Cast alloys are selected when molten aluminum is formed into a mold cavity, making them relevant to complex housings, enclosures and production geometries.
- ADC12
- A380
- Die Casting
- Complex Housings
- Production Geometry
- Secondary Machining Review
Need precision-machined features from plate or bar?
Wrought aluminum may be worth reviewing.
Need complex housing geometry produced through casting?
A die casting alloy may be more appropriate.
ALLOY SELECTION
How to Choose an Aluminum Alloy
The best aluminum alloy depends on the part rather than the alloy alone. Geometry, manufacturing route, critical interfaces, finishing and production requirements should be reviewed together.
Strength Requirements
Review the functional load, assembly interface and part size before choosing between common aluminum alloy families.
Weight
Aluminum is often selected for lower weight, but the final part design still needs enough stiffness and support.
Machinability
Machinability affects tool access, surface finish, cycle planning and cost review for CNC parts.
Formability
Formed aluminum covers, panels and brackets should be reviewed for bend behavior and geometry constraints.
Corrosion Environment
Exposure conditions can affect alloy choice and whether additional finishing should be reviewed.
Surface Finishing
Finishing results can vary by alloy and process, so appearance and functional requirements should be defined early.
CNC MACHINING
Aluminum for CNC Machining
Aluminum is commonly machined because many alloys cut efficiently and can support housings, brackets, plates, heat sinks and precision mechanical components. CNC review should still consider tool access, thin walls, deep pockets, critical dimensions and surface requirements.
Common Alloys to Review
- 6061
- 6082
- 7075
DIE CASTING
Aluminum for Die Casting
Die casting may be reviewed for aluminum components that need complex housing geometry, ribs, bosses, wall design and production consistency. Some die cast parts also require secondary CNC machining, surface finishing or assembly-related review after casting.
Common Alloys to Review
- ADC12
- A380
SHEET & FORMED PARTS
Aluminum for Sheet Metal & Formed Parts
Sheet and formed aluminum components are often reviewed for covers, panels, brackets and lightweight structures. 5052 is a common industry reference for formed aluminum parts, but alloy choice should still follow drawing, bend and surface requirements.
Covers & Panels
Aluminum sheet can be reviewed when lightweight covers or panels need formed geometry and defined appearance surfaces.
Brackets
Formed aluminum brackets should be checked for bend lines, hole placement and assembly loads.
Surface Requirements
Visible surfaces and post-forming finish requirements should be identified on the drawing where needed.
DESIGN CONSIDERATIONS
Design Considerations for Aluminum Parts
Aluminum part design should connect material choice with manufacturing route. The same alloy can behave differently depending on whether the part is machined, cast, formed or finished.
Thin Walls
Thin walls can affect machining stability, forming behavior or casting fill. Review wall geometry against process and part function.
Internal Radii
Internal corners and radii influence CNC tool access and cast geometry transitions. Avoid sharp internal features where the function permits.
Deep Pockets
Deep pockets can affect tool reach, machining time and surface consistency. Feature access should be reviewed before quotation.
Threads
Threaded holes and fastening features should define location, depth and assembly requirements clearly on the drawing.
Mating Interfaces
Critical surfaces, bores and mounting faces should be identified so manufacturing and inspection can focus on the right features.
Surface Requirements
Appearance-sensitive areas and finish requirements can affect alloy selection, machining allowance and finishing sequence.
SURFACE FINISHING
Surface Finishing Options for Aluminum Parts
Aluminum finishing should be reviewed together with alloy, manufacturing process, appearance surfaces and functional requirements. Other finishing routes may be reviewed depending on project requirements.
Anodizing
Anodizing is commonly reviewed for aluminum parts when appearance or surface protection requirements match the alloy and part condition.
Powder Coating
Powder coating may be used where color, coverage and external appearance requirements are important.
Painting
Painting can be reviewed for color, appearance or product-specific finish requirements.
Polishing / Mechanical Finishing
Mechanical finishing can affect visual texture and local surface condition before or after other operations.
MATERIAL TRADE-OFFS
When Should You Consider Another Material?
Aluminum is useful for many applications, but material selection should follow functional and manufacturing requirements. Another material may be worth reviewing when the operating conditions point beyond aluminum.
01
Higher Strength or Wear Requirements
Some load or wear conditions may justify reviewing stainless steel, carbon steel or other material options.
02
Higher Temperature Requirements
Thermal exposure and dimensional stability should be reviewed before confirming aluminum.
03
Specific Chemical Environments
Chemical exposure can affect corrosion behavior and finish selection, so environment should be defined early.
04
Electrical or Functional Requirements
Electrical conductivity, insulation, shielding, thermal behavior and assembly requirements should be reviewed against the intended function before confirming the material.
CONTINUE YOUR REVIEW
From Aluminum Selection to Manufacturing Review
After selecting a candidate alloy, the next step is to review how geometry, process route, surface finish and RFQ information connect.
Material Selection Guide
Compare aluminum with stainless steel, carbon steel, copper alloys and engineering plastics.
Open ResourceDesign Guidelines
Review geometry, tolerances, interfaces and manufacturing constraints before quotation.
Open ResourceCNC Machining Guide
Review CNC-specific design considerations for machined aluminum components.
Open ResourceDie Casting Guide
Review die-casting considerations for aluminum housings and production components.
Open ResourceSelect the Alloy
Shortlist aluminum materials according to function, geometry and environment.
Review the Manufacturing Process
Match the alloy with CNC machining, die casting, forming and finishing needs.
Prepare Drawings & RFQ
Send drawings, CAD files, quantity, material and critical requirements for review.
ALUMINUM FAQ
Aluminum Material & Manufacturing FAQs
Short answers for common aluminum material questions before manufacturing review.
Which aluminum alloy is commonly used for CNC machining?
6061 is commonly reviewed because it offers a useful balance of machinability, strength and corrosion resistance. Alloys such as 6082 or 7075 may also be considered depending on structural, strength and manufacturing requirements.
What is the difference between 6061 and 7075 aluminum?
6061 is often reviewed for balanced machinability, corrosion resistance and general manufacturing needs, while 7075 is usually considered when higher strength is required. The better choice depends on function, manufacturing route, finishing requirements, cost and sourcing considerations.
What aluminum alloys are commonly used for die casting?
ADC12 and A380 are common aluminum die-casting alloys in industrial manufacturing. Final alloy selection should be reviewed against the component geometry, production requirements and downstream operations.
Can aluminum parts be anodized after machining?
Yes, anodizing is commonly used for aluminum parts after machining when the finish matches the alloy, appearance and functional requirements. Results can vary by alloy and part condition, so finishing requirements should be reviewed early.
Is aluminum suitable for thin-wall parts?
It can be, but suitable wall thickness depends on alloy, geometry, manufacturing process, part size and functional requirements. Thin-wall features should be reviewed for machining stability, forming behavior or casting flow depending on the route.
How should I choose between aluminum and stainless steel?
Compare weight, strength, corrosion environment, machinability, surface requirements and the application. Aluminum is often reviewed when lower weight and machinability matter, while stainless steel may be considered for different strength, wear or corrosion requirements. The Material Selection Guide can help compare broader material options.