Zamak 3 alloy(AG40A) and Zamak 5 alloy(AG41A) Advantage

Zamak 3 alloy(AG40A) and Zamak 5 alloy(AG41A) are the most widely used zinc alloy in the zinc die casting industry.due to have below advantage:

  • Excellent physical and mechanical properties
  • Good castability and Flow
  • Long term dimensional stability.
  • Excellent finishing characteristics for chromate treatments, painting and plating.

Zamak 5 alloy has the same composition as Zamak 3 , beside 1% copper been add to improve corrosive resistance, hardness and strength. However, these improvements are tempered with a reduction in ductility that can affect formability during crimping, secondary bending, swaging or riveting operations. The alloy can be readily plated, finished and machined when compared to zamak 3 alloy.

Difference between zamak 5 and zamak 3

Chemical Composition

ElementZamak 3 Content(%)Zamak 5 Content(%)
Aluminum, Al3.5-4.33.5-4.3
Copper, Cu0.250.75-1.25
Magnesium, Mg0.02-0.050.02-0.05
Iron, Fe0.10.1
Lead, Pb0.0050.005
Cadmium, Cd0.0040.004
Tin, Sn0.0030.003

Physical Properties

Density6.6 g/cm30.24 lb/in3
Melting point380-386°C717-727°F

Mechanical Properties

Zamak 3 alloy

Tensile strength268 MPa38900 psi
Yield strength208 MPa30200 psi
Modulus of elasticity96 GPa14000000 psi
Elongation at break10%10%
Brinell hardness8282

Zamak 5 alloy

Tensile strength331 MPa48000 psi
Yield strength295 MPa43000 psi
Modulus of elasticity96 GPa14000000 psi
Elongation at break7%7%
Brinell hardness9191

Thermal Properties

PropertiesZamak 3 MetricZamak 5 Metric
Thermal conductivity113 W/mK109 W/mK

Zamak 3 Equivalent

Zamak 3Alloy 3AG40AZDC 2ZX01Alloy AZ-A4Z400Z35520

Zinc Die Casting Advantage

Dimensional accuracy with great surface.

High strength and hardness, stable size, can die-cast thin-walled complex castings.

Suitable for batch production. The machine has high productivity, can have multiple cavities in one mold, and has a long life of die-casting. A pair of die-casting molds and die-casting alloys have a life even millions of times; it is easy to realize mechanization and automation.

Good economic benefits. Zinc alloy die castings have the advantages of precise size and smooth surface. Generally, it can be used directly without mechanical processing. Therefore, zinc alloy die-casting is used, which not only improves metal utilization, but also reduces a large number of processing equipment and manpowers; the price of castings is easy cut down; combined die-casting can be used for other metals or non-metals Material. It saves not only assembly man-hours but also metal.

Surface treatment. Easy to do various surface treatments, such as electroplating, spraying, etc.

Good machinability and corrosion resistance

Zinc Die Casting Disadvantage

1. Due to the high speed of liquid metal filling the cavity during die-casting, the fluid state is unstable, so the general die-casting method is used, and the zinc alloy die-casting is easy to porosity and cannot be heat treated;

2. Die-casting is more difficult for castings with complex shape;

3. High melting point alloys (such as copper, ferrous metals), the die-casting mold has a low life;

4. It is not suitable for small batch production. The main reasons are the high manufacturing cost of die-casting molds, the high production efficiency of die-casting machines, and the uneconomical production of small batches.


Now more and more industry are using zinc alloy material for their parts, such as in below industry.

Plumbing fittings
Automotive parts
Ceiling fans
diecasting toys

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