Aluminum 8090-T4 vs 8090-T651
Aluminum · 8090 temper comparison
8090-T4 and 8090-T651 are two conditions of the same aluminum grade, 8090: T4 (solution heat treated and naturally aged) versus T651 (T6, stress relieved by stretching). The chemistry is identical, so every difference below comes from the condition. 8090-T651 is the stronger of the two: yield strength 415 MPa (60.2 ksi) against 200 MPa (29 ksi) for 8090-T4, about 108% more; tensile strength follows at 480 MPa (69.6 ksi) vs 330 MPa (47.9 ksi). In exchange, 8090-T4 is the more ductile: elongation 18% versus 5% for 8090-T651, and 8090-T651 is harder (145 HB vs 88 HB). 8090-T651 runs hotter in service (120°C vs 100°C continuous).
8090-T4Choose it when the part is bent, formed or impact-loaded.
8090-T651Choose it when strength drives the design, or when the part sees heat.
8090-T4 vs 8090-T651: 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.
Shear Modulus
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 78 GPa11.3 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 2.54 g/cm³0.09 lb/in³ · Melting Point (Solidus) 600°C1,112 °F · Liquidus Temperature 655°C1,211 °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 930 J/kg·K0.22 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 21.4 µm/m·K11.9 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Polishability
Same in both: Weldability 25 / 100 · Brazeability / Solderability 15 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Same in both: Embodied Carbon (primary production) 14 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.
8090-T4 vs 8090-T651 — frequently asked
Is 8090-T651 stronger than 8090-T4?
Yes. 8090-T651 has a typical yield strength of 415 MPa (60.2 ksi) against 200 MPa (29 ksi) for 8090-T4 — about 108% more. Tensile strength is 480 MPa (69.6 ksi) vs 330 MPa (47.9 ksi).
Which condition does FabDigit quote by default, T4 or T651?
T851 is the default 8090 condition in the FabDigit quote flow (neither T4 nor T651). 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, 8090-T4 or 8090-T651?
8090-T651. Its machinability rates good (55/100) against fair (48/100) for 8090-T4.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8090-T4 and 8090-T651 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.