Aluminum 6061/Al2O3/20p-O vs 6061/Al2O3/20p-T4
Aluminum · 6061/Al2O3/20p temper comparison
6061/Al2O3/20p-O and 6061/Al2O3/20p-T4 are two conditions of the same aluminum grade, 6061/Al2O3/20p: O (annealed) versus T4 (solution heat treated and naturally aged). The chemistry is identical, so every difference below comes from the condition. 6061/Al2O3/20p-T4 is the stronger of the two: yield strength 180 MPa (26.1 ksi) against 75 MPa (10.9 ksi) for 6061/Al2O3/20p-O, about 140% more; tensile strength follows at 290 MPa (42.1 ksi) vs 150 MPa (21.8 ksi). In exchange, 6061/Al2O3/20p-O is the more ductile: elongation 10% versus 5% for 6061/Al2O3/20p-T4, and 6061/Al2O3/20p-T4 is harder (78 HB vs 48 HB). 6061/Al2O3/20p-O runs hotter in service (180°C vs 150°C continuous) and 6061/Al2O3/20p-O conducts heat better (165 W/m·K vs 140 W/m·K).
6061/Al2O3/20p-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
6061/Al2O3/20p-T4Choose it when strength drives the design.
6061/Al2O3/20p-O vs 6061/Al2O3/20p-T4: 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.
6061/Al2O3/20p-O6061/Al2O3/20p-T4
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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 98 GPa14.2 Msi · Shear Modulus 38 GPa5.5 Msi · Bulk Modulus 90 GPa13.1 Msi · Poisson's Ratio 0.32 · Reduction in Area 3% · Compressive Strength 340 MPa49.3 ksi · Hardness, Vickers 118 HV
Physical
Density and transition temperatures.
Same in both: Density 2.9 g/cm³0.1 lb/in³ · Melting Point (Solidus) 582°C1,080 °F · Liquidus Temperature 652°C1,206 °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 880 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 18 µm/m·K10 µin/in·°F · Latent Heat of Fusion 290 J/g125 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 5.4×10⁻⁸ Ω·m2.13 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.8 V · Corrosion Resistance 55 / 100
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 %) 20% · Weldability 35 / 100 · Castability 45 / 100 · Brazeability / Solderability 25 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 215 MJ/kg92,433 BTU/lb · Embodied Carbon (primary production) 13.5 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 5%
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.
6061/Al2O3/20p-O vs 6061/Al2O3/20p-T4 — frequently asked
Is 6061/Al2O3/20p-T4 stronger than 6061/Al2O3/20p-O?
Yes. 6061/Al2O3/20p-T4 has a typical yield strength of 180 MPa (26.1 ksi) against 75 MPa (10.9 ksi) for 6061/Al2O3/20p-O — about 140% more. Tensile strength is 290 MPa (42.1 ksi) vs 150 MPa (21.8 ksi).
Which condition does FabDigit quote by default, O or T4?
T6 is the default 6061/Al2O3/20p condition in the FabDigit quote flow (neither O nor T4). 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 6061/Al2O3/20p-O over 6061/Al2O3/20p-T4?
Pick 6061/Al2O3/20p-O when the part is bent, formed or impact-loaded, or when the part sees heat. Pick 6061/Al2O3/20p-T4 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 6061/Al2O3/20p-O and 6061/Al2O3/20p-T4 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.