Aluminum 339.0-T5 vs 339.0-T6
Aluminum · 339.0 temper comparison
339.0-T5 and 339.0-T6 are two conditions of the same aluminum grade, 339.0: T5 (cooled from hot working and artificially aged) versus T6 (solution heat treated and artificially aged). The chemistry is identical, so every difference below comes from the condition. 339.0-T6 is the stronger of the two: yield strength 255 MPa (37 ksi) against 234 MPa (33.9 ksi) for 339.0-T5, about 9% more; tensile strength follows at 295 MPa (42.8 ksi) vs 276 MPa (40 ksi). 339.0-T6 is harder — 115 HB against 100 HB for 339.0-T5 — which matters for wear surfaces and threads. 339.0-T5 runs hotter in service (250°C vs 200°C continuous).
339.0-T5Choose it when the part sees heat.
339.0-T6Choose it when strength drives the design, or when surface hardness matters.
339.0-T5 vs 339.0-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)
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 81 GPa11.7 Msi · Shear Modulus 30 GPa4.4 Msi · Bulk Modulus 77 GPa11.2 Msi · Poisson's Ratio 0.33 · Elongation at Break 1%
Physical
Density and transition temperatures.
Same in both: Density 2.73 g/cm³0.1 lb/in³ · Melting Point (Solidus) 505°C941 °F · Liquidus Temperature 580°C1,076 °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) 19.4 µm/m·K10.8 µin/in·°F · Latent Heat of Fusion 490 J/g211 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) -0.75 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 80 / 100 · Brazeability / Solderability 18 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 150 MJ/kg64,488 BTU/lb · Embodied Carbon (primary production) 9 kg CO₂/kg · Embodied Water 1,100 L/kg132 gal/lb · Typical Recycled Content 60%
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.
339.0-T5 vs 339.0-T6 — frequently asked
Is 339.0-T6 stronger than 339.0-T5?
Yes. 339.0-T6 has a typical yield strength of 255 MPa (37 ksi) against 234 MPa (33.9 ksi) for 339.0-T5 — about 9% more. Tensile strength is 295 MPa (42.8 ksi) vs 276 MPa (40 ksi).
Which condition does FabDigit quote by default, T5 or T6?
T5 is the default 339.0 condition in the FabDigit quote flow. 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 339.0-T5 over 339.0-T6?
Pick 339.0-T5 when the part sees heat. Pick 339.0-T6 when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 339.0-T5 and 339.0-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.