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Aluminum

7075-T6

7075-T6 is a high-strength Zn-based (7000-series) aerospace aluminum, heat-treated to its T6 peak. With roughly 503 MPa yield it rivals many steels by weight, making it the premium choice for highly stressed aluminum parts. The trade-offs are lower corrosion resistance, higher cost, and poor weldability compared with 6061.

How 7075-T6 machines

Machines well for a high-strength alloy (rated 3.5/5), better than its strength suggests because the zinc content keeps chips manageable. It cuts cleaner than 6061 in some respects but is more abrasive and harder on edges, so sharp carbide and steady feeds matter. Watch for residual-stress distortion when machining thick plate.

Manufacturing & processing

Best suited to CNC milling and turning from plate or bar; it is generally not arc-welded because the weld zone cracks and loses strength. Finishing is typically anodizing (often Type II or hard anodize) or chromate conversion for corrosion protection. Stress-relieved plate stock helps control distortion in deep-pocket machined parts.

Typical applications

Dominant in aerospace and high-stress structures: aircraft wing spars, fuselage fittings, bulkheads, and frames, plus military hardware, high-end bike components, climbing and tactical gear, mold tooling, and motorsport parts. It is chosen wherever the strength-to-weight of aluminum must be pushed near its practical limit.

When to choose it

Choose 7075-T6 when you need maximum aluminum strength and stiffness for the weight and can accept higher cost and protective finishing. Pick 6061-T6 instead if you need to weld, want better corrosion resistance, or want to save cost. Choose 2024-T3 when fatigue life under cyclic load is the priority.

Suitable surface finishes

Common finishes for 7075-T6: Type II anodizing, chromate/Alodine, powder coating, bead blasting. Use the finish selector →

FAQ

Can 7075-T6 be welded?
Generally no. 7075 is considered non-weldable by conventional arc methods because the weld and heat-affected zone are prone to hot cracking and severe strength loss. Designs use mechanical fasteners, riveting, or bonding instead. If welding is unavoidable, 6061 or 7000-series weldable variants are far better choices.
Is 7075-T6 stronger than 6061-T6?
Yes, substantially. 7075-T6 yields around 503 MPa versus about 276 MPa for 6061-T6, nearly double. It is the stronger, stiffer-feeling structural aluminum, but it costs more, resists corrosion less well, and cannot be reliably welded, so it is reserved for genuinely high-stress parts.
Does 7075 corrode more than 6061?
Yes. Its zinc-copper chemistry makes it more susceptible to corrosion and stress-corrosion cracking than 6061 (rated 2.5 vs 3.5 here). For service in moisture or marine environments it should be anodized, chromate-converted, or otherwise protected, or substituted with a more corrosion-resistant alloy.

Property values are typical/nominal for early guidance and vary by temper, grade, supplier and heat treatment. Confirm critical specs against a certified datasheet or with an mfgiq engineer.