When it comes to precision die cast components, engineers and procurement managers often face the same question: should we go with aluminium or zamak?Sales Manager

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When it comes to precision die cast components, engineers and procurement managers often face the same question: should we go with aluminium or zamak? At Micrometal, we have been working with both materials for over 30 years.

Based on our experience producing millions of zinc die cast parts, here are five key reasons why zamak is often the smarter choice for precision technical components.

1. Superior Dimensional Tolerances

Zamak die casting achieves tolerances as tight as ±0.05 mm directly from the mould, with no secondary machining required. Aluminium die casting typically delivers tolerances of ±0.1 to 0.2 mm and almost always requires CNC finishing to meet tight specifications.

For applications where precision is critical — such as lock mechanisms, electronic housings, or gas valve bodies — this difference translates directly into lower production costs and faster delivery times.

2. Dramatically Longer Mould Life

One of the most significant advantages of zamak over aluminium is the lifespan of the die casting moulds. This means your tooling investment is amortised over a much larger production run, resulting in a significantly lower cost per part. At Micrometal, we guarantee our moulds for 400,000 shots and store them in three vertical storage systems with a combined capacity of 185,000 kg.

3. 30% Energy Savings

Zamak melts at approximately 400°C, while aluminium requires temperatures of around 660°C. This 260°C difference means that zamak die casting consumes roughly 30% less energy than aluminium processing.

In an era where energy costs are rising and sustainability matters more than ever, this is a competitive advantage that directly impacts your production costs and environmental footprint. Zamak is also 100% recyclable with zero toxic emissions during the casting process.

4. Better Surface Finish and Plating

Zamak produces parts with an exceptionally smooth surface finish straight from the mould. All galvanic treatments — chrome plating, nickel plating, zinc plating, gold plating — adhere perfectly to zamak without requiring any pre-treatment.

Aluminium, on the other hand, needs extensive surface preparation before any plating can be applied, adding cost and time to the production process. For components that require a high-quality decorative or protective finish, zamak is the clear winner.

5. Complex Shapes in a Single Step

Thanks to its high fluidity and low melting point, zamak allows the casting of extremely complex geometries with thin walls, undercuts, threads, and holes — all in a single step. No machining, no welding, no assembly of multiple parts.

With aluminium die casting, achieving the same level of geometric complexity typically requires additional machining operations, which increases both cost and lead time.

When Should You Choose Aluminium Instead?

The Bottom Line

For precision components in locks, electronics, gas valves, automotive interiors, furniture hardware, lighting, and appliances, zamak die casting offers better tolerances, longer mould life, lower energy costs, superior surface finishing, and more complex geometries than aluminium — all at a lower cost per part.

At Micrometal, we specialise in zamak hot chamber die casting and micro die casting since 1991. With 11 machines running two shifts and a monthly capacity of 75,000 kg, we are ready to support your next project.