Material choice is the single biggest factor in the performance, durability and cost of a custom part. This guide compares the most common materials used in automotive, marine and industrial components.
Aluminum
Lightweight and corrosion-resistant, aluminum is the default choice for performance and weight-sensitive parts.
- 6061 — general-purpose, good strength and machinability
- 7075 — high strength, used for demanding components
Common finishing includes anodizing for color and wear resistance. Typical uses: brackets, CNC components, motorcycle levers, bicycle stems.
Stainless steel
The standard for corrosion resistance and a premium appearance.
- 304 — general-purpose stainless, good corrosion resistance
- 316 — marine-grade, superior resistance to saltwater
Common finishing includes mirror and electropolishing. Typical uses: marine hardware, exhaust components, rail fittings.
Steel
High strength and low cost, ideal for structural and heavy-duty parts. Finishing such as powder coating or galvanizing provides corrosion protection. Typical uses: tow hooks, brackets, truck bed accessories.
Brass
Excellent machinability and an attractive golden finish, often used for decorative and low-friction hardware. Typical uses: yacht interior fittings, plumbing components.
Engineering plastics
Lightweight, corrosion-free and cost-effective for high-volume parts. UV-resistant grades are used for exterior and marine applications. Typical uses: clips, housings, interior fittings.
Choosing a finish
| Finish | Best for | Typical materials |
|---|---|---|
| Anodizing | Color, wear resistance | Aluminum |
| Powder coating | Durable color, corrosion | Steel, aluminum |
| Polishing | Premium appearance | Stainless steel, brass |
| Zinc plating | Low-cost corrosion protection | Steel |
Summary
Match the material to the environment and the load. For saltwater, choose 316 stainless steel. For weight-sensitive parts, choose aluminum. For heavy-duty structural parts, choose coated steel. A manufacturer who asks about your application before recommending a material is a good sign.
For help selecting materials for your custom parts, contact our team with your application details.
Specialists in custom vehicle parts manufacturing — OEM/ODM, CNC machining, materials selection and finishing for 8 vehicle lines.
