Aluminum 7039 vs 7075
Aluminum · grade comparison
Aluminum 7039 and 7075 are both aluminum grades. 7075 is the stronger of the two: yield strength 503 MPa (73 ksi) against 380 MPa (55.1 ksi) for 7039, about 32% more; tensile strength follows at 572 MPa (83 ksi) vs 450 MPa (65.3 ksi). In exchange, 7039 is the more ductile: elongation 13% versus 11% for 7075, and 7075 is harder (150 HB vs 133 HB). 7039 conducts heat better (154 W/m·K vs 130 W/m·K). On the shop floor, 7039 welds better (very good vs poor).
7039Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
7075Choose it when strength drives the design.
7039 vs 7075: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all aluminum grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all aluminum grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Rockwell B
Hardness, Vickers
Same in both: Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Same in both: Specific Heat Capacity 960 J/kg·K0.23 BTU/lb·°F · Max Service Temperature (continuous) 120°C248 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Typical Recycled Content
Same in both: Embodied Energy (primary production) 205 MJ/kg88,134 BTU/lb · Embodied Carbon (primary production) 12.5 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every aluminum grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | 7039 | 7075 |
|---|---|---|
| Default condition | T6 | T6 |
| Relative cost | $$$ Premium | $$$ Premium |
| Min. machined wall | 0.5 mm | 0.8 mm |
| Best machined surface | Ra 0.8 µm | Ra 0.8 µm |
Both are offered for CNC machining and Sheet metal. Both take the same 16 finishes: Anodizing Type II, Cerakote, Chem Film (Alodine), DLC, E-Coating, Electroless Nickel (EN), Electropolishing, Epoxy Coating, Gold Plating, Hard Anodize Type III w/ PTFE, Hard Anodizing Type III, Nickel Plating and 4 more.
7039 vs 7075 — frequently asked
Is 7075 stronger than 7039?
Yes. 7075 has a typical yield strength of 503 MPa (73 ksi) against 380 MPa (55.1 ksi) for 7039 — about 32% more. Tensile strength is 572 MPa (83 ksi) vs 450 MPa (65.3 ksi).
Which is cheaper, 7039 or 7075?
Both sit in the same relative cost tier ($$$, premium); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, 7039 or 7075?
7075, by a small margin. Both rate very good for machinability — 78/100 against 70/100 for 7039; for welding the order is 7039 first (very good, 75/100) then 7075 (poor, 18/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7039 and 7075 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.