Aluminum 2A50-T4 vs 2A50-T651
Aluminum · 2A50 temper comparison
2A50-T4 and 2A50-T651 are two conditions of the same aluminum grade, 2A50: 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. 2A50-T651 is the stronger of the two: yield strength 315 MPa (45.7 ksi) against 200 MPa (29 ksi) for 2A50-T4, about 57% more; tensile strength follows at 400 MPa (58 ksi) vs 320 MPa (46.4 ksi). In exchange, 2A50-T4 is the more ductile: elongation 18% versus 11% for 2A50-T651, and 2A50-T651 is harder (100 HB vs 75 HB). 2A50-T651 runs hotter in service (150°C vs 100°C continuous) and 2A50-T651 conducts heat better (165 W/m·K vs 135 W/m·K). On the shop floor, 2A50-T651 machines more easily (very good vs good).
2A50-T4Choose it when the part is bent, formed or impact-loaded.
2A50-T651Choose it when strength drives the design, or when the part sees heat.
2A50-T4 vs 2A50-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.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 27 GPa3.9 Msi · Bulk Modulus 75 GPa10.9 Msi · Poisson's Ratio 0.33 · Hardness, Vickers 110 HV
Physical
Density and transition temperatures.
Same in both: Density 2.75 g/cm³0.1 lb/in³ · Melting Point (Solidus) 510°C950 °F · Liquidus Temperature 638°C1,180 °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) 22.5 µm/m·K12.5 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
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.69 V · Corrosion Resistance 35 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 25 / 100 · Castability 30 / 100 · Brazeability / Solderability 20 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 12.5 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 25%
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.
2A50-T4 vs 2A50-T651 — frequently asked
Is 2A50-T651 stronger than 2A50-T4?
Yes. 2A50-T651 has a typical yield strength of 315 MPa (45.7 ksi) against 200 MPa (29 ksi) for 2A50-T4 — about 57% more. Tensile strength is 400 MPa (58 ksi) vs 320 MPa (46.4 ksi).
Which condition does FabDigit quote by default, T4 or T651?
T6 is the default 2A50 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, 2A50-T4 or 2A50-T651?
2A50-T651. Its machinability rates very good (72/100) against good (60/100) for 2A50-T4.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 2A50-T4 and 2A50-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.