Zinc Alloy Zamak 7 · finish state · default condition
Zinc Alloy Zamak 7 As Cast
Properties of the As Cast condition, compared with the other Zamak 7 tempers.
Standard supply condition for Zamak 7 hot-chamber die castings — pick for thin-wall, high-ductility, plate-quality parts.
What is Zamak 7 As Cast?
Zamak 7 As Cast is Zamak 7 supplied in the As Cast condition — standard supply condition for Zamak 7 hot-chamber die castings — pick for thin-wall, high-ductility, plate-quality parts. Zamak 7 As Cast has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 283 MPa (41 ksi) — stronger than 57% of zinc alloy grades. Elongation at break is 13% and the elastic modulus is 96 GPa (13.9 Msi). Zamak 7 As Cast 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).
Advantages
- Polishes to a fine finish — 85/100, better than 89% of zinc alloy grades
Zamak 7 As Cast properties
Typical room-temperature values for Zamak 7 As Cast — 9 properties are specific to this condition; the rest are grade-level values shared by every Zamak 7 temper. Each bar shows where the value sits among the zinc alloy grades in FabDigit's library — further right is higher.
Physical3
Zamak 7 As Cast 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).
Mechanical11
Zamak 7 As Cast has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 283 MPa (41 ksi) — stronger than 57% of zinc alloy grades. Elongation at break is 13% and the elastic modulus is 96 GPa (13.9 Msi).
Thermal6
Zamak 7 As Cast 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 As Cast 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 As Cast 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%.
Manufacturability7
Zamak 7 As Cast's machinability is very good (80/100, better than 64% of zinc alloy grades); weldability poor (15/100); formability fair (35/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Zamak 7 tempers and conditions
Zamak 7 is also supplied in 1 other condition. The full side-by-side table is on the Zamak 7 overview.
- As CastDefaultStandard supply condition for Zamak 7 hot-chamber die castings — pick for thin-wall, high-ductility, plate-quality parts.210 MPa yield · 80 HB
Working with Zamak 7 As Cast
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 As Cast — frequently asked
What is Zamak 7 As Cast used for?
Zamak 7 As Cast 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 As Cast?
Zamak 7 As Cast has a typical yield strength of 210 MPa (30.5 ksi) and a tensile strength of 283 MPa (41 ksi) — stronger than 57% of zinc alloy grades. Strength varies by condition: see the 2 listed tempers.
Is Zamak 7 As Cast easy to machine?
Yes — machinability is rated very good (80/100, better than 64% 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 As Cast 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 As Cast?
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 As Cast 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 As Cast?
Zamak 7 As Cast 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 As Cast?
Yes — Zamak 7 As Cast 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.