Aluminum vs. Steel: Which Material Is Lighter for Your Part?

When choosing between aluminum and steel for a custom CNC part, most people think "lightweight = aluminum". And it’s true—aluminum is inherently lighter. But from our experience at Ekinsun, real-world decisions should consider not just density, but also strength, cost, machinability, and application environment.

Comparison of CNC machined aluminum and steel parts weight on a scale for precision machining decisions.

• Aluminum density: ~2.70 g/cm³

• Steel density: ~7.85 g/cm³

🟢 Result: Aluminum is roughly one-third the weight of steel for the same volume.

👉 Try our permanently free Material Weight Calculator tool to instantly compare weights based on actual dimensions and material choices.

Beyond Weight: What Really Matters for Your Part

• Strength-to-Weight: Aluminum is lighter, but steel is much stronger—use high-grade alloys or redesigned cross-sections for optimal results.

• Corrosion Resistance: Aluminum naturally resists rust; steel needs coating or stainless options.

• Machinability & Cost: Aluminum machines faster, costs less in prototyping and small batches; steel may increase tool wear but offers durability.

• Welding & Finishing: Steel supports more post-processing options; some aluminum alloys are harder to weld.

Here’s a real example: a German client needed a structural component. By switching from steel to Aluminum 6061 and adjusting thickness, we achieved 40% weight reduction, 25% faster machining, and delivered 3 days sooner—all while maintaining the same strength.

Real-World Tip: Use Data, Not Guesswork

Don’t choose material based on name alone. Use tools to compare:

• Material Weight Calculator

• Machining Time Estimator

• Price Estimator

All tools are completely free and designed for fast, accurate decision-making.

At Ekinsun, our expertise as a precision CNC machining supplier enables you to evaluate trade-offs in weight, cost, material, and environment—so you can make smarter choices for your parts.

If you're still not sure, send your drawing or specs our way—we’ll help you compare aluminum and steel options and provide a real-world quote.

Get a Free Quote

Related Engineering Tools & Resources

• Material Weight Calculator – https://www.ekinsun.ltd/tools/material-weight-calculator

• CNC Machining Time Estimator – https://www.ekinsun.ltd/tools/cnc-machining-time-estimator

• CNC Price Estimator – https://www.ekinsun.ltd/tools/price-estimator

Written by the Ekinsun Precision Engineering Team – Expert custom CNC parts supplier and machining resource provider.

Google Sites

Report abuse