Why Choose Zinc Alloy

• Lowest-Cost Die Casting Metal

  Zinc's low melting point (approximately 380°C for Zamak alloys) means fast cycle times, low energy consumption, and significantly reduced die wear compared to aluminum or brass die casting. For high-volume parts with complex geometry, zinc die casting is typically the lowest cost-per-part manufacturing option.

• Exceptional Fluidity for Complex Geometry

  Zinc alloys have excellent fluidity in the molten state — they fill thin walls (down to 0.5 mm), sharp corners, and complex internal features that aluminum cannot reliably fill in die casting. This allows more complex geometry to be achieved in the as-cast condition, reducing machining stock.

• Excellent Plating Substrate

  Zinc is the best die casting metal for electroplating — chrome, nickel, and copper plating adhere reliably and uniformly to zinc substrates. This makes zinc die casting the standard for decorative hardware, automotive trim, and consumer products requiring a plated finish.

• Good Dimensional Stability

  Zamak alloys have predictable shrinkage and good dimensional stability after casting — tighter as-cast tolerances than aluminum die casting, often eliminating the need for secondary machining on non-critical features.

Common Zinc Alloy Grades

• Zamak 2

  Highest strength and hardness of the Zamak series — used for parts requiring maximum strength in the as-cast condition. Higher creep resistance than Zamak 3/5.

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• Zamak 3

  Most widely used zinc die casting alloy — excellent balance of strength, ductility, plating characteristics, and dimensional stability. The default choice for general-purpose zinc die casting.

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• Zamak 5

  Slightly higher strength than Zamak 3 due to copper addition. Better creep resistance — used for load-bearing parts and components operating at slightly elevated temperatures.

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• Our Machining Capability

  We supply zinc alloy parts as die cast billets with post-machining to precision dimensions. Die casting produces the near-net shape; CNC machining then brings critical bores, threads, sealing faces, and mating surfaces to ±0.005 mm. This combination gives the cost advantage of die casting for the bulk geometry with the accuracy of precision machining where it counts. Surface treatment — electroplating, powder coating, chromate conversion — is coordinated as part of our standard process.

• Limitations & Cost Considerations

  Zinc alloys have lower strength and temperature resistance than aluminum — maximum service temperature is approximately 120°C for Zamak alloys. For parts operating at higher temperatures or under significant structural load, aluminum or magnesium die casting is the correct choice. Zinc also has higher density than aluminum (6.6 g/cm³ vs. 2.7 g/cm³) — for weight-sensitive applications, zinc is not competitive with aluminum or magnesium.