Aluminum 2519-O vs 2519-T851
Aluminum · 2519 temper comparison
2519-O and 2519-T851 are two conditions of the same aluminum grade, 2519: O (annealed) versus T851 (T8, stress relieved by stretching). The chemistry is identical, so every difference below comes from the condition. 2519-T851 is the stronger of the two: yield strength 400 MPa (58 ksi) against 80 MPa (11.6 ksi) for 2519-O, about 5.0 times as much; tensile strength follows at 462 MPa (67 ksi) vs 175 MPa (25.4 ksi). In exchange, 2519-O is the more ductile: elongation 20% versus 10% for 2519-T851, and 2519-T851 is harder (130 HB vs 48 HB). 2519-O conducts heat better (170 W/m·K vs 124 W/m·K). On the shop floor, 2519-T851 machines more easily (very good vs fair).
2519-OChoose it when the part is bent, formed or impact-loaded.
2519-T851Choose it when strength drives the design, or when the part is machined in volume.
2519-O vs 2519-T851: 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
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 73.1 GPa10.6 Msi · Shear Modulus 27.5 GPa4 Msi · Bulk Modulus 71 GPa10.3 Msi · Poisson's Ratio 0.33 · Compressive Strength 455 MPa66 ksi · Fatigue Strength (Endurance Limit) 105 MPa15.2 ksi · Hardness, Rockwell B 78 HRB · Hardness, Vickers 145 HV
Physical
Density and transition temperatures.
Same in both: Density 2.82 g/cm³0.1 lb/in³ · Melting Point (Solidus) 543°C1,009 °F · Liquidus Temperature 643°C1,189 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 864 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 22.3 µm/m·K12.4 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Max Service Temperature (continuous) 150°C302 °F · 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) -0.64 V · Corrosion Resistance 38 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 60% · Castability 30 / 100 · Brazeability / Solderability 15 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 210 MJ/kg90,284 BTU/lb · Embodied Carbon (primary production) 12.5 kg CO₂/kg · Embodied Water 1,100 L/kg132 gal/lb · Typical Recycled Content 15%
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.
2519-O vs 2519-T851 — frequently asked
Is 2519-T851 stronger than 2519-O?
Yes. 2519-T851 has a typical yield strength of 400 MPa (58 ksi) against 80 MPa (11.6 ksi) for 2519-O — about 5.0 times as much. Tensile strength is 462 MPa (67 ksi) vs 175 MPa (25.4 ksi).
Which condition does FabDigit quote by default, O or T851?
T87 is the default 2519 condition in the FabDigit quote flow (neither O nor T851). 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, 2519-O or 2519-T851?
2519-T851. Its machinability rates very good (74/100) against fair (45/100) for 2519-O; for welding the order is 2519-O first (very good, 80/100) then 2519-T851 (very good, 75/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 2519-O and 2519-T851 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.