Aluminum 707.0-T1 vs 707.0-T7
Aluminum · 707.0 temper comparison
707.0-T1 and 707.0-T7 are two conditions of the same aluminum grade, 707.0: T1 (cooled from hot working and naturally aged) versus T7 (solution heat treated and overaged (stabilized)). The chemistry is identical, so every difference below comes from the condition. 707.0-T7 is the stronger of the two: yield strength 220 MPa (31.9 ksi) against 165 MPa (23.9 ksi) for 707.0-T1, about 33% more; tensile strength follows at 275 MPa (39.9 ksi) vs 228 MPa (33.1 ksi). In exchange, 707.0-T1 is the more ductile: elongation 3% versus 2% for 707.0-T7, and 707.0-T7 is harder (85 HB vs 68 HB). 707.0-T7 runs hotter in service (175°C vs 120°C continuous) and 707.0-T7 conducts electricity better (37 % IACS vs 33 % IACS).
707.0-T1Choose it when the part is bent, formed or impact-loaded.
707.0-T7Choose it when strength drives the design, or when the part sees heat.
707.0-T1 vs 707.0-T7: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 70.5 GPa10.2 Msi · Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 71 GPa10.3 Msi · Poisson's Ratio 0.33 · Compressive Strength 200 MPa29 ksi · Fracture Toughness (K_IC) 20 MPa·√m18.2 ksi·√in · Charpy V-Notch Impact (RT) 5 J3.7 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 2.9 g/cm³0.1 lb/in³ · Melting Point (Solidus) 599°C1,110 °F · Liquidus Temperature 643°C1,189 °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 900 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.6 µm/m·K13.1 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
Same in both: Electrical Resistivity 4.9×10⁻⁸ Ω·m1.93 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.85 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 70% · Weldability 40 / 100 · Formability (cold) 10 / 100 · Castability 35 / 100 · Brazeability / Solderability 20 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 12 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 40%
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.
707.0-T1 vs 707.0-T7 — frequently asked
Is 707.0-T7 stronger than 707.0-T1?
Yes. 707.0-T7 has a typical yield strength of 220 MPa (31.9 ksi) against 165 MPa (23.9 ksi) for 707.0-T1 — about 33% more. Tensile strength is 275 MPa (39.9 ksi) vs 228 MPa (33.1 ksi).
Which condition does FabDigit quote by default, T1 or T7?
T5 is the default 707.0 condition in the FabDigit quote flow (neither T1 nor T7). 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.
When should I choose 707.0-T1 over 707.0-T7?
Pick 707.0-T1 when the part is bent, formed or impact-loaded. Pick 707.0-T7 when strength drives the design, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 707.0-T1 and 707.0-T7 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.