Zinc Die Casting Alloys | Zamak 3, Zamak 5 & ZA-8

Zinc die casting alloys are used for small to medium precision parts that need excellent dimensional accuracy, thin walls, strong as-cast surface quality, and high-volume economics. The most common zinc alloys are Zamak 3, Zamak 5, and ZA-8.

Compared with aluminum die casting, zinc die casting usually offers longer die life, tighter as-cast tolerances, smoother surfaces, and better plating quality. The tradeoff is higher density and lower high-temperature strength.

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Zinc Alloy Comparison

Alloy	Key Strength	Best Fit
Zamak 3	Best balance of castability, stability, and cost	General hardware, housings, small precision parts
Zamak 5	Higher strength and hardness from copper addition	Lock bodies, hinges, load-bearing hardware
ZA-8	Higher aluminum content and improved strength	Structural zinc parts and bearing-like applications

For detailed pages, see Zamak 3, Zamak 5, and ZA-8.

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Why Buyers Choose Zinc Die Casting

• Thin walls and sharp features are easier than with aluminum
• As-cast dimensional accuracy is excellent
• Tool life is much longer than aluminum die casting
• Hot-chamber production cycle time is fast
• Surface finish is suitable for nickel, chrome, and decorative plating
• Small precision parts can often avoid CNC machining

These advantages make zinc a strong choice for locks, hinges, connector bodies, decorative hardware, instrument parts, and compact mechanisms.

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Zinc vs Aluminum Die Casting

Factor	Zinc Alloys	Aluminum Alloys
Density	Higher	Lower
Die life	Very high	Lower due to higher casting temperature
Surface finish	Excellent	Good
Plating	Excellent	More difficult
Heat resistance	Lower	Better
Part size	Best for small to medium parts	Better for larger housings
Thermal conductivity	Moderate	Better for heat sinks

If weight or heat dissipation is the main design driver, aluminum is often better. If dimensional precision, plating, and small-feature quality matter more, zinc is often better.

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Common Applications

• Window and door lock bodies
• Hinges and hardware fittings
• Connector housings
• Decorative covers
• Instrument components
• Appliance hardware
• Small gear and mechanism housings
• Security and container lock parts

For application examples, see zinc die casting and lock hardware product family.

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FAQ

Which zinc die casting alloy is most common?

Zamak 3 is the most common zinc die casting alloy because it has excellent castability, dimensional stability, and cost performance.

Is Zamak 5 stronger than Zamak 3?

Yes. Zamak 5 contains more copper, which improves strength and hardness. It is often chosen for lock bodies, hinges, and hardware parts that need better wear resistance.

Can zinc die cast parts be plated?

Yes. Zinc die castings are well suited to nickel, chrome, and decorative plating when the casting surface and pretreatment process are controlled.

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Zinc alloy inquiry: yaoqingpu1983@gmail.com | +86 138 1403 4409 | No.6, Rungu Road, Nanjing, China