Aluminum 7049A-O vs 7049A-T73
Aluminum · 7049A temper comparison
7049A-O and 7049A-T73 are two conditions of the same aluminum grade, 7049A: O (annealed) versus T73 (solution heat treated and overaged for stress-corrosion resistance). The chemistry is identical, so every difference below comes from the condition. 7049A-T73 is the stronger of the two: yield strength 465 MPa (67.4 ksi) against 115 MPa (16.7 ksi) for 7049A-O, about 4.0 times as much; tensile strength follows at 535 MPa (77.6 ksi) vs 250 MPa (36.3 ksi). In exchange, 7049A-O is the more ductile: elongation 16% versus 9% for 7049A-T73, and 7049A-T73 is harder (135 HB vs 65 HB). 7049A-T73 runs hotter in service (150°C vs 120°C continuous) and 7049A-O conducts heat better (175 W/m·K vs 155 W/m·K). On the shop floor, 7049A-T73 machines more easily (good vs fair).
7049A-OChoose it when the part is bent, formed or impact-loaded.
7049A-T73Choose it when strength drives the design, or when the part sees heat.
7049A-O vs 7049A-T73: 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.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 27 GPa3.9 Msi · Bulk Modulus 70 GPa10.2 Msi · Poisson's Ratio 0.33 · Compressive Strength 585 MPa84.8 ksi
Physical
Density and transition temperatures.
Same in both: Density 2.84 g/cm³0.1 lb/in³ · Melting Point (Solidus) 477°C891 °F · Liquidus Temperature 635°C1,175 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 960 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.4 µm/m·K13 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.84 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 70% · Weldability 12 / 100 · Castability 25 / 100 · Brazeability / Solderability 10 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
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 · Typical Recycled Content 8%
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.
7049A-O vs 7049A-T73 — frequently asked
Is 7049A-T73 stronger than 7049A-O?
Yes. 7049A-T73 has a typical yield strength of 465 MPa (67.4 ksi) against 115 MPa (16.7 ksi) for 7049A-O — about 4.0 times as much. Tensile strength is 535 MPa (77.6 ksi) vs 250 MPa (36.3 ksi).
Which condition does FabDigit quote by default, O or T73?
T6 is the default 7049A condition in the FabDigit quote flow (neither O nor T73). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, 7049A-O or 7049A-T73?
7049A-T73. Its machinability rates good (62/100) against fair (45/100) for 7049A-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7049A-O and 7049A-T73 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.