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Home / Resources / Zamak 3 vs Zamak 5: Choosing a Zinc Die Casting Alloy
Materials

Zamak 3 vs Zamak 5: Choosing a Zinc Die Casting Alloy

Zamak 3 and Zamak 5 are zinc die-casting alloys with different strength, hardness and ductility tradeoffs.

Written by ZAODA Updated Oct 30, 2026
Metal hardware component from the authorized production photo collection
ZAODA zinc component photograph; the required alloy grade is specified for each project.

Zamak 3 and Zamak 5 are zinc die-casting alloys with different strength, hardness and ductility tradeoffs. Zamak 5 contains more copper and is generally stronger and harder; that does not automatically make it the better choice for a feature that must deform during assembly.

Material identity includes the production route

Start with the assembly operation

A staked pin, crimped tab or riveted feature needs sufficient deformation without cracking. A loaded latch or threaded boss may put more emphasis on strength, wear and sustained loading. Compare the actual grade, supplied condition, service temperature and local section before selecting material.

Requirement Review for both grades Evidence that closes the decision
Staking or crimping Local strain and available ductility Assembly trial on cast samples
Sustained load Stress, temperature and time Application-relevant creep assessment
Threaded connection Engagement and boss section Torque and repeated-assembly test
Visible hardware Plating route and surface condition Approved finished-part appearance

Do not substitute from a strength table alone

Typical published alloy properties help with screening. They do not guarantee the behavior of a thin feature or the result after a particular finish. Compare values on the same test basis, and keep minimum acceptance requirements separate from typical data.

For an illustrative staked connector, replacing Zamak 3 with Zamak 5 may improve one load margin while making the staking operation less forgiving. The correct trial follows the production sequence, including coating and assembly. Passing a tensile test on a separate specimen would not by itself qualify the stake.

Design for the final dimensions

Both grades can be considered for detailed hardware with appropriate finishing. Define coating build, rack-contact zones and finished mating dimensions. A plated shaft or locating slot must be accepted after the deposit that changes its size. Avoid correcting an approved fit by uncontrolled polishing at assembly.

State the governing material specification and traceability requirement on the order. When considering an alternative, document why it is proposed and which dimensional, assembly and environmental checks must be repeated. Keep the discussion about zinc alloy 3 versus 5 tied to the component rather than calling either grade universally superior.

References