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The right material for sheet metal chassis fabrication depends on weight, environment, and budget. Aluminum keeps builds light, stainless steel stands up to tougher conditions, and galvanized sheet adds protection against rust. HSJ works with a wide range of metals, so this guide helps you narrow the field before you ask for a quote.
Aluminum also pairs well with anodizing, which is on HSJ’s finishing list. That gives you a protective, attractive surface without extra bulk. Still, aluminum isn’t perfect for everything. If a part has to flex repeatedly, like a clip or contact spring, you’ll want a different metal.
Stainless steel steps in when conditions get tougher. HSJ lists SUS in models 201, 304, and 316. Picture a cabinet in a humid workshop or near the coast, where plain steel would struggle. Stainless gives you a more resilient base, though you’ll pay for that and should decide whether the environment truly demands it.
SPTE, spring steel, and manganese steel round out the list. Spring steel is the natural pick when a part has to bend and return to its shape. Manganese steel suits heavier duty. For SPTE, a quick chat with the engineers will tell you whether it fits your design, so ask rather than guess.
Bend radius is part of the same conversation. For stretched or drawn features, the corner radius should be at least equal to the sheet thickness, and 3 to 5 times thickness is typical, with 8 times as the upper limit. Tight corners crack some materials, so ask what your chosen metal can handle.
What Materials Can HSJ Use?
HSJ’s chassis material list is long, and that’s a good thing for buyers. Instead of forcing every project into one metal, the factory works with a spread of steels, coppers, and aluminum grades. Here’s the full lineup, so you can see what’s actually available before you plan:- SGCC galvanized plate
- SECC electrolytic plate
- SUS stainless steel in models 201, 304, and 316
- SPCC iron plate
- White copper and red copper
- Aluminum plate in models 5052 and 6061
- SPTE, spring steel, and manganese steel
When Does Aluminum Make the Most Sense?
Choose aluminum when weight is the enemy. The 5052 and 6061 grades on HSJ’s list suit robots, handheld equipment, and any product that has to be carried, shipped, or mounted high up. Vehicles show the same shift, as carbon steel remains common but aluminum alloys are becoming more usual thanks to their light weight.Aluminum also pairs well with anodizing, which is on HSJ’s finishing list. That gives you a protective, attractive surface without extra bulk. Still, aluminum isn’t perfect for everything. If a part has to flex repeatedly, like a clip or contact spring, you’ll want a different metal.
What About Steel, Stainless, and Galvanized Sheet?
Steel remains the workhorse in sheet metal chassis fabrication, and HSJ offers several types. SGCC is galvanized, SECC is electrolytic, and SPCC is plain iron plate. Galvanized and coated sheets help with rust protection, while bare iron usually needs a finish such as powder coating or lacquer painting to stay protected over time.Stainless steel steps in when conditions get tougher. HSJ lists SUS in models 201, 304, and 316. Picture a cabinet in a humid workshop or near the coast, where plain steel would struggle. Stainless gives you a more resilient base, though you’ll pay for that and should decide whether the environment truly demands it.
Where Do Copper, SPTE, and Spring Steel Fit?
Copper and its alloys, listed by HSJ as white copper and red copper, handle needs that other metals don’t. Think of parts that must conduct, shield, or simply look different from the rest of the assembly. They’re a niche choice, so confirm the reason for using them with your engineer before ordering.SPTE, spring steel, and manganese steel round out the list. Spring steel is the natural pick when a part has to bend and return to its shape. Manganese steel suits heavier duty. For SPTE, a quick chat with the engineers will tell you whether it fits your design, so ask rather than guess.
How Do Thickness and Tolerance Interact With Material?
Material and thickness work as a pair. HSJ lists a thickness range from 0.1 mm up to 20 mm, with tolerance between 0.02 mm and 0.1 mm. Softer metals like aluminum and copper behave differently in a bend than stiff spring steel. Share your preferred thickness and your must hit dimensions together, so the engineers can check feasibility.Bend radius is part of the same conversation. For stretched or drawn features, the corner radius should be at least equal to the sheet thickness, and 3 to 5 times thickness is typical, with 8 times as the upper limit. Tight corners crack some materials, so ask what your chosen metal can handle.
Can You Mix Materials in One Chassis?
Yes, and many designs do. A main body in aluminum might carry stainless fasteners or a copper contact plate, each chosen for its job. HSJ lists sheet metal chassis fasteners among its solutions, so hardware can be planned together with the housing. Matching metals matters, because mixing the wrong pair can invite corrosion at the joint.How Do You Pick the Right Material in Practice?
For a precision sheet metal chassis, a short decision path beats guessing. Start with the limits your product can’t cross, then let those limits cut the material list down to a few candidates. Try these steps in order and write down your answers before you contact HSJ:- Decide the maximum weight your product can carry
- Identify the environment, whether indoor, outdoor, humid, or marine
- Set the strength and flex needs
- Pick a finish that matches the environment
- Send files and ask the engineers to confirm