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Sand Casting vs Die Casting — Which Method Suits Your Product?
The choice of casting method is one of the decisions with the greatest impact on a component’s cost, quality and suitability for the application. Yet it is a decision that is often made without sufficient technical basis — either because the buyer relies entirely on the supplier’s recommendation, or because they choose what they already know.
This article provides a structured comparison between sand casting and die casting — the two dominant methods for metal casting of industrial components.
The fundamentals
What is sand casting?
Sand casting uses a mould made of compacted sand, which is destroyed after each pour. The method is highly flexible and can produce components from a few hundred grams to several tonnes.
What is die casting?
Die casting uses a permanent steel die into which molten metal is injected under high pressure. The die is reused for thousands or millions of cycles.
Comparison
| Parameter | Sand Casting | Die Casting (HPDC) |
|---|---|---|
| Tooling cost | Low (EUR 500–5,000) | High (EUR 15,000–80,000) |
| Unit cost at low volume | Lower | Higher |
| Unit cost at high volume | Higher | Lower |
| Tolerances (as cast) | CT9–CT11 | CT6–CT7 |
| Surface finish | Ra 6.3–25 µm | Ra 1.6��6.3 µm |
| Min. wall thickness | 3–5 mm | 0.8–1.5 mm |
| Max. weight | Up to several tonnes | Typically up to 10–15 kg |
| Materials | All metals | Primarily aluminium, zinc, magnesium |
| Lead time (tooling) | 2–6 weeks | 8–14 weeks |
| Economical volume | 1–5,000/year | 5,000+/year |
When to choose sand casting
- Low to medium volumes (below 5,000 per year)
- Large or heavy components
- Ferrous alloys (iron, steel)
- Prototypes or first-off production
- Short lead times needed
When to choose die casting
- High volumes (above 5,000 per year)
- Tight tolerances and fine surface finish required
- Thin-walled aluminium or zinc components
- Near-net-shape to minimise machining
Traficator’s recommendation
We evaluate each project individually and recommend the casting method that optimises cost, quality and lead time for your specific application. Our supplier network covers both sand casting and die casting foundries in Sweden and internationally.
Contact us for a method recommendation for your component.
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