7021 aluminum is a high-strength, weldable 7xxx series alloy primarily alloyed with zinc and magnesium, with a copper addition for strength. It is engineered for structural applications that demand high strength, good weldability, and reasonable corrosion resistance. While not as strong as 7075, 7021 offers a better balance of weldability and strength, making it a preferred choice for welded structures in transport and aerospace. Linsy supplies 7021 as sheet, tube, bar, and wire with mill test certificates on every order.
Available forms: sheet / plate, tube, bar / rod, wire
Common tempers: T6, T651
Processing support: CNC machining, laser cutting, TIG/MIG welding, anodizing, polishing, powder coating
Quality documents: MTC report with every order
7021 aluminum is a high-strength, weldable 7xxx series alloy primarily alloyed with zinc and magnesium, with a copper addition for strength. It is engineered for structural applications that demand high strength, good weldability, and reasonable corrosion resistance. While not as strong as 7075, 7021 offers a better balance of weldability and strength, making it a preferred choice for welded structures in transport and aerospace. Linsy supplies 7021 as sheet, tube, bar, and wire with mill test certificates on every order.
Available tempers: T6, T651
| Temper | Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|---|
| T6, T651 | 0.5 – 150 | 500 – 2600 | 500 – 16000 (cut-to-length) |
Available tempers: T6, T651
| Temper | Outer Diameter (mm) | Wall (mm) | Length (mm) |
|---|---|---|---|
| T6, T651 | 6 – 300 | 0.5 – 40 | 500 – 12000 |
Available tempers: T6, T651
| Temper | Diameter (mm) | Length (mm) |
|---|---|---|
| T6, T651 | 3 – 300 | 500 – 12000 |
Available tempers: T6, T651
| Diameter (mm) | Coil weight | Tolerance |
|---|---|---|
| 0.8 – 30 | Min 50 kg | ± 0.02 mm |
7021 aluminum (EN AW-7021, AlZn5.5Mg1.5) is supplied to common wrought-alloy specifications. Typical standards by form: ASTM B209 (sheet and plate), ASTM B221 (extruded tube, bar, and profiles), ASTM B211 (bar and rod), and ASTM B313 (welded tube). Forging stock follows ASTM B247. Always confirm the exact specification and temper with our team for your order.
| Element | Percentage (%) |
|---|---|
| Si | 0.40 max |
| Fe | 0.50 max |
| Cu | 1.2 – 2.0 |
| Mn | 0.10 – 0.40 |
| Mg | 1.2 – 1.8 |
| Cr | 0.10 – 0.25 |
| Zn | 5.0 – 6.0 |
| Ti | 0.10 max |
| Zr | 0.10 max |
| Others (each) | 0.05 |
| Others (total) | 0.15 |
| Al | Balance |
| Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Shear Strength (MPa) |
|---|---|---|---|---|
| T6 | 470 | 420 | 10 | 150 – 340 |
| T651 | 470 | 420 | 10 | 150 – 340 |
Values are typical for the indicated condition. An em dash (—) means the value was not available in the source data; confirm with the mill certificate. Asterisked values are estimates pending verification — see the audit report.
Stronger than 7020 while remaining weldable for fabricated structures.
Suitable for load-bearing welded assemblies.
Adequate for internal and coated external service.
Precipitation hardening delivers the specified strength.
Linsy laser-cuts and CNC-machines 7021, and welds it with qualified MIG/TIG procedures. For exterior service, anodizing or painting is recommended. Post-weld heat treatment can be discussed with our engineers to recover strength.
Linsy is a Shenzhen-based aluminum supplier with more than 20 years of experience. Our quality system is certified to ISO 9001, ISO 14001, and ISO 45001. Every order ships with a mill test certificate (MTC). SGS third-party test reports are available on request. Typical custom lead time is 10–60 days depending on temper, size, and quantity.
For deeper reading on 7xxx selection and fabrication, see our guides on aluminum alloy selection and welding 7000-series alloys. (Internal links to be connected to published Linsy blog articles.)
7021 is stronger and still weldable, but 7020 generally has the edge in weldability and corrosion. Choose 7021 when you need more strength in a welded build.
T6 and T651 are the standard tempers. T651 reduces residual stress for machining.
Every order ships with an MTC, and SGS third-party test reports are available on request.
Custom orders typically ship in 10–60 days depending on temper, size, and quantity.
Custom aluminum orders typically ship in 10–60 days depending on alloy, temper, size, and quantity. Stock or standard sizes may be faster — ask our team.
Yes. Every order includes an MTC. SGS third-party test reports are available on request.
Yes. We provide CNC machining, laser cutting, welding, anodizing, polishing, and powder coating so parts can be delivered closer to finished form.
Send your alloy, temper, dimensions, quantity, and required standard. Our team will confirm availability, lead time, and pricing.
Linsy Advantages
Linsy Aluminum is a leading supplier of aluminum processing products, serving diverse industries including aerospace, general engineering, automotive, marine, shipbuilding and other specialized industrial applications.
We are committed to maintaining the highest standards of quality and environmental responsibility, as demonstrated by our certifications: ISO 9001:2008， ISO 14001:2004 and SGS.
