For manufacturers, engineers, and procurement teams in aerospace, automotive, and precision machinery, 7075 aluminum bars represent a gold standard in high-strength, lightweight metallic materials. Unlike general-purpose alloys like 6061, 7075 is classified as a “super hard aluminum alloy” -  a designation earned from its exceptional mechanical properties, which stem directly from its carefully calibrated chemical composition. Below is a detailed breakdown of 7075 aluminum bars’ composition, performance characteristics, and application ranges, designed to help you make informed decisions for your high-stress, precision-focused projects.

Chemical Composition: The Foundation of 7075’s Strength

The performance of 7075 aluminum bars begins with its precise alloying element (ratio), which is strictly regulated by industry standards such as ASTM B211 (for aluminum and aluminum alloy bars) and AMS 4125 (aerospace grade specifications). Unlike pure aluminum (which is soft and ductile), 7075 relies on three principal alloying elements to achieve its strength, supplemented by trace elements for grain refinement and stability.

- Zinc (Zn): 5.1%~6.1% – The primary hardening agent. Zinc forms intermetallic compounds (e.g., MgZn₂) during heat treatment, which precipitate within the aluminum matrix to resist deformation. This high zinc content is the single most critical factor behind 7075’s industry-leading strength-to-weight ratio.

- Magnesium (Mg): 2.1%~2.9% – Works synergistically with zinc to enhance hardening. Magnesium increases the density of precipitates formed during heat treatment, further boosting tensile and yield strength. Without magnesium, zinc alone would not deliver 7075’s signature durability.

- Copper (Cu): 1.2%~2.0% – Improves both strength and machinability. Copper forms additional intermetallic phases (e.g., Al₂CuMg) that refine the alloy’s microstructure, reducing tool wear during CNC machining and ensuring consistent part dimensions.

- Trace Elements – Silicon (Si ≤ 0.40%), iron (Fe ≤ 0.50%), manganese (Mn ≤ 0.30%), chromium (Cr 0.18%~0.28%), titanium (Ti ≤ 0.20%), and other impurities (total ≤ 0.15%) are tightly controlled. Chromium, in particular, enhances corrosion resistance by limiting grain growth, while titanium refines the alloy’s grain structure for better uniformity.

This composition is non-negotiable for 7075’s performance: even minor deviations from these ranges can reduce strength by 10%~15% or increase susceptibility to corrosion a risk no high-precision project can afford.

Key Mechanical & Physical Properties

7075 aluminum bars are valued for their balance of strength, machinability, and stability properties that are optimized through heat treatment (The most commonly temper T6, which is the mainstream choice for 7075 aluminum bars in the industry). Below are the critical performance metrics that set 7075 apart from other aluminum alloys:

1. Mechanical Strength

- Tensile Strength: 572MPa (83,000psi) in T6 temper, this means 7075 can withstand nearly 60 kilograms of force per square millimeter before breaking, surpassing 6061 aluminum (310MPa) by 85%.

- Yield Strength: 503MPa (73,000psi) in T6 temper, yield strength measures the force at which the alloy begins to deform permanently. For structural components (e.g., aircraft landing gear parts), this metric is critical to preventing catastrophic failure.

- Elongation at Break: 11% (in 50mm gauge length), while 7075 is far stronger than 6061, it still maintains moderate ductility, allowing for forming processes like bending (with proper heat treatment) without cracking.

2. Machinability & Workability

7075 aluminum bars excel in precision machining, a must for industries like aerospace and medical device manufacturing. In the T6 temper, the alloy’s uniform microstructure minimizes “chip welding” (a common issue with softer alloys) and reduces tool wear by up to 30% compared to 2024 aluminum. It performs exceptionally well in:

- CNC milling (for complex geometries like engine brackets)

- Turning (for cylindrical parts like shafts)

- Drilling (for high-tolerance holes in structural components)

3. Corrosion Resistance & Thermal Stability

- Corrosion Resistance: 7075 offers good resistance to atmospheric corrosion (e.g., humidity, mild chemicals) but requires surface treatments (e.g., anodizing, chromate conversion coating) for use in marine or high-salt environments. Unlike some high-strength alloys, it is not prone to stress corrosion cracking (SCC) when properly heat-treated and aged.

- Thermal Stability: The alloy retains 90% of its strength at temperatures up to 120°C (248°F), making it suitable for applications like under-hood automotive components or aircraft engine nacelles. Above 150°C (302°F), however, its strength begins to decline, so it is not recommended for high-temperature environments like furnace parts.

4. Physical Properties

- Density: 2.81g/cm³, 30% lighter than steel (7.85g/cm³) and 10% lighter than brass, making it ideal for weight-sensitive applications (e.g., electric vehicle frames, drone bodies).

- Thermal Conductivity: 130W/(m·K), lower than pure aluminum (237W/(m·K)) but sufficient for applications that requiring moderate heat dissipation (e.g., heat sinks for industrial motors).

Application scope: Advantages of 7075 aluminum rod

7075’s unique combination of strength, light weight, and machinability makes it indispensable across industries that demand reliability and precision. Below are its most common use cases:

1. Aerospace & Defense

The aerospace industry is 7075’s largest consumer, as it meets strict “aerospace-grade” requirements for strength and weight. Applications include:

- Aircraft structural components: Wing spars, fuselage frames, and landing gear struts (where strength-to-weight ratio is non-negotiable).

- Satellite and drone parts: Payload brackets, propeller shafts, and antenna mounts (where weight reduction improves fuel efficiency or flight time).

- Defense equipment: Armor plates for light vehicles, missile components, and firearm parts (where durability under impact is critical).

2. Automotive (High-Performance & EV)

For automotive manufacturers, 7075 aluminum bars enable weight reduction without sacrificing safety, a key goal for electric vehicles (EVs) and high-performance cars:

- EV components: Battery frame supports, motor mounts, and suspension arms (reducing vehicle weight to extend range).

- High-performance vehicles: Brake calipers, drive shafts, and chassis components (improving handling by lowering unsprung weight).

3. Industrial Machinery & Tooling

In industrial settings, 7075 is used for parts that endure repeated stress or require precision:

- Machine tool components: CNC lathe beds, milling machine columns, and tool holders (where stability prevents vibration during machining).

- Heavy equipment: Hydraulic cylinder rods, crane boom pins, and conveyor system shafts (where strength resists bending under load).

4. Sports & Recreational Equipment

Even consumer products benefit from 7075’s strength and light weight:

- Bicycle parts: Frame tubes, handlebars, and pedal spindles (for durability during off-road riding).

- Golf clubs: Driver heads and putter shafts (where stiffness improves swing accuracy).

- Marine equipment: Boat rigging components and sailboat mast fittings (resisting corrosion from saltwater when anodized).

Partner With Us for Premium 7075 Aluminum Bars

Our company specializes in manufacturing 7075 aluminum bars that meet and exceed international standards (ASTM B211, AMS 4125, DIN 1725). The product specifications are as follows:

- Diameters: 10 mm to 300 mm (custom sizes available upon request).

- Tempers: T6 (most common), T6511 (stress-relieved), and T73 (corrosion-resistant for marine applications).

- Surface finishes: Mill finish (for machining), anodized (for corrosion protection), or chromate-coated (for aerospace use).

Every batch of our 7075 aluminum bars comes with a detailed material certificate (MTC) confirming chemical composition and mechanical properties, ensuring full traceability for your quality control processes. Whether you need small quantities for prototype development or large volume orders for mass production, we offer competitive pricing and on-time delivery to keep your projects on track.

Contact us now to request samples, inquire about custom specifications, or obtain a non-obligation quote. Let our expertise in aluminum alloy help you create products with higher strength, lighter weight, and greater reliability.