Aluminum ADC12-O vs ADC12-T6
Aluminum · ADC12 temper comparison
ADC12-O and ADC12-T6 are two conditions of the same aluminum grade, ADC12: O (annealed) versus T6 (solution heat treated and artificially aged). The chemistry is identical, so every difference below comes from the condition. ADC12-T6 is the stronger of the two: yield strength 260 MPa (37.7 ksi) against 115 MPa (16.7 ksi) for ADC12-O, about 126% more; tensile strength follows at 340 MPa (49.3 ksi) vs 240 MPa (34.8 ksi). In exchange, ADC12-O is the more ductile: elongation 4.5% versus 1% for ADC12-T6, and ADC12-T6 is harder (110 HB vs 62 HB). ADC12-O runs hotter in service (200°C vs 175°C continuous). On the shop floor, ADC12-T6 machines more easily (very good vs good).
ADC12-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ADC12-T6Choose it when strength drives the design, or when the part is machined in volume.
ADC12-O vs ADC12-T6: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 69 GPa10 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.74 g/cm³0.1 lb/in³ · Melting Point (Solidus) 515°C959 °F · Liquidus Temperature 582°C1,080 °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 963 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 21.1 µm/m·K11.7 µin/in·°F · Latent Heat of Fusion 389 J/g167 BTU/lb · Min Service Temperature -50°C-58 °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) -0.78 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 95 / 100 · Brazeability / Solderability 20 / 100 · Polishability 40 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 180 MJ/kg77,386 BTU/lb · Embodied Carbon (primary production) 11.5 kg CO₂/kg · Embodied Water 1,100 L/kg132 gal/lb · Typical Recycled Content 90%
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.
ADC12-O vs ADC12-T6 — frequently asked
Is ADC12-T6 stronger than ADC12-O?
Yes. ADC12-T6 has a typical yield strength of 260 MPa (37.7 ksi) against 115 MPa (16.7 ksi) for ADC12-O — about 126% more. Tensile strength is 340 MPa (49.3 ksi) vs 240 MPa (34.8 ksi).
Which condition does FabDigit quote by default, O or T6?
F is the default ADC12 condition in the FabDigit quote flow (neither O nor T6). 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, ADC12-O or ADC12-T6?
ADC12-T6. Its machinability rates very good (72/100) against good (62/100) for ADC12-O; for welding the order is ADC12-O first (poor, 22/100) then ADC12-T6 (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in ADC12-O and ADC12-T6 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.