Zinc Alloy Zamak 7 Aged
Heat-treated state
ASTM Zamak 7 · UNS Z33523
Aged = aged / stabilized
Use these de-rated numbers for long-life design or when castings are dimensionally stabilized before precision machining.
Values for the Aged condition
Other Zamak 7 tempers and conditions
Zamak 7 is listed in 2 conditions; see the grade overview at Zamak 7.
- Aged
- As Cast
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AgedThis page Aged / stabilized | Use these de-rated numbers for long-life design or when castings are dimensionally stabilized before precision machining. | 195 | 255 | 16 | 72 HB | 27 % IACS |
As CastDefault hot-chamber die cast, as-manufactured | Standard supply condition for Zamak 7 hot-chamber die castings — pick for thin-wall, high-ductility, plate-quality parts. | 210 | 283 | 13 | 80 HB | 27 % IACS |
What is Zamak 7 Aged?
Zamak 7 Aged is Zamak 7 heat treated to Aged — use these de-rated numbers for long-life design or when castings are dimensionally stabilized before precision machining. Zamak 7 Aged has a yield strength of 195 MPa (28.3 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 57% of zinc alloy grades. Elongation at break is 16% and the elastic modulus is 96 GPa (13.9 Msi). Zamak 7 Aged has a density of 6.6 g/cm³ (0.238 lb/in³), lighter than 64% of zinc alloy grades. It melts at 381°C (718 °F). As Cast is the default condition FabDigit quotes; Aged is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 89% of zinc alloy grades
- Ductile — tolerates forming and impact — 16%, better than 79% of zinc alloy grades
Zamak 7 Aged properties
Typical room-temperature values for Zamak 7 Aged; 19 are specific to this condition. Other listed values are Zamak 7 reference data and may not represent this condition. Bars are the position among zinc alloy grades.
Physical3
Zamak 7 Aged has a density of 6.6 g/cm³ (0.238 lb/in³), lighter than 64% of zinc alloy grades. It melts at 381°C (718 °F).
Mechanical13
Zamak 7 Aged has a yield strength of 195 MPa (28.3 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 57% of zinc alloy grades. Elongation at break is 16% and the elastic modulus is 96 GPa (13.9 Msi).
Thermal6
Zamak 7 Aged is rated for continuous service to 95°C (203 °F). It conducts heat at 113 W/m·K (65.3 BTU/hr·ft·°F), better than 57% of zinc alloy grades. Thermal expansion is 27.4 µm/m·K (15.2 µin/in·°F).
Electrical3
Zamak 7 Aged conducts electricity at 27 % IACS, worse than 57% of zinc alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), better than 71% of zinc alloy grades.
Sustainability4
Producing a kilogram of Zamak 7 Aged takes about 53 MJ of energy and emits 3.5 kg of CO₂ — less than 68% of zinc alloy grades. Typical recycled content is 25%.
Manufacturability8
Zamak 7 Aged's machinability is very good (82/100, better than 86% of zinc alloy grades); weldability poor (15/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Zamak 7 Aged
Is Zamak 7 easy to machine?
Machines very freely with sharp carbide or HSS tools, high speed and light feed; no cutting fluid strictly needed, but avoid built-up edge with polished rake faces.
Can Zamak 7 be welded?
Not weldable in practice — join by soldering, adhesive bonding, self-tapping screws, staking or press-fit inserts.
Can Zamak 7 be formed, bent or molded?
Hot-chamber die casting at ~410–430 °C melt; the low-Mg chemistry gives the best fluidity of the Zamak family for 0.4–0.8 mm walls, but demands SHG zinc and tight impurity control (Pb/Cd/Sn) to avoid intergranular corrosion.
What surface finishes work on Zamak 7?
Excellent substrate for bright Cu-Ni-Cr plating, chromate/trivalent passivation, powder coat and e-coat; polish or vibratory finish before plating — never anodize.
Zamak 7 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Al | 3.5 – 4.3 | 4 |
| Mgdeliberately low vs Zamak 3 for fluidity and ductility | 0.01 – 0.02 | 0.01 |
| Niadded to offset low Mg and suppress intergranular corrosion | 0.01 – 0.02 | 0.01 |
| Cuimpurity limit | ≤ 0.25 | 0.05 |
| Fe | ≤ 0.08 | — |
| Pbmax, tighter than Zamak 3 | ≤ 0 | — |
| Cd | ≤ 0 | — |
| Sn | ≤ 0 | — |
| ZnSpecial High Grade 99.99 % Zn base | balance | — |
Zamak 7 Aged — frequently asked
What is Zamak 7 Aged used for?
Zamak 7 Aged is typically used for plated decorative parts, cosmetic cases, thin-wall electronic housings and shields, nameplates and emblems, precision hardware and trim and small connector and hinge components. In short: plating-grade die-cast zinc.
What is the yield strength of Zamak 7 Aged?
Zamak 7 Aged has a typical yield strength of 195 MPa (28.3 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 57% of zinc alloy grades. Strength varies by condition: see the 2 listed tempers.
Is Zamak 7 Aged easy to machine?
Yes — machinability is rated very good (82/100, better than 86% of zinc alloy grades). Machines very freely with sharp carbide or HSS tools, high speed and light feed; no cutting fluid strictly needed, but avoid built-up edge with polished rake faces.
Can Zamak 7 Aged be welded?
Not readily — weldability is rated poor (15/100). Not weldable in practice — join by soldering, adhesive bonding, self-tapping screws, staking or press-fit inserts.
What surface finishes work on Zamak 7 Aged?
Excellent substrate for bright Cu-Ni-Cr plating, chromate/trivalent passivation, powder coat and e-coat; polish or vibratory finish before plating — never anodize.
Can Zamak 7 Aged be formed, bent or molded?
Hot-chamber die casting at ~410–430 °C melt; the low-Mg chemistry gives the best fluidity of the Zamak family for 0.4–0.8 mm walls, but demands SHG zinc and tight impurity control (Pb/Cd/Sn) to avoid intergranular corrosion.
What is the maximum service temperature of Zamak 7 Aged?
Zamak 7 Aged is rated for continuous use to about 95°C (203 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Zamak 7 As Cast and Zamak 7 Aged?
As Cast is the default condition — standard supply condition for Zamak 7 hot-chamber die castings — pick for thin-wall, high-ductility, plate-quality parts. Aged: use these de-rated numbers for long-life design or when castings are dimensionally stabilized before precision machining. Yield strength is 210 MPa in As Cast versus 195 MPa in Aged.
Can FabDigit make parts in Zamak 7 Aged?
Yes — Zamak 7 Aged is available for CNC machining with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B86 — Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings (Alloy AG40B / UNS Z33523) — ASTM International (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Zinc and Zinc Alloys) — ASM International (1990)
- NADCA Product Specification Standards for Die Castings — Zinc Alloys — North American Die Casting Association (2020)
- European Zinc Die Casters Association / Eastern Alloys Zamak alloy data — EZDA / Eastern Alloys (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.