Aluminum 7136-O vs 7136-W51
Aluminum · 7136 temper comparison
7136-O and 7136-W51 are two conditions of the same aluminum grade, 7136: O (annealed) versus W51 (solution heat treated, stress relieved by stretching). The chemistry is identical, so every difference below comes from the condition. 7136-W51 is the stronger of the two: yield strength 250 MPa (36.3 ksi) against 110 MPa (16 ksi) for 7136-O, about 127% more; tensile strength follows at 400 MPa (58 ksi) vs 235 MPa (34.1 ksi). 7136-W51 is harder — 92 HB against 62 HB for 7136-O — which matters for wear surfaces and threads. 7136-O runs hotter in service (150°C vs 65°C continuous) and 7136-O conducts heat better (175 W/m·K vs 122 W/m·K). On the shop floor, 7136-O forms better (65 vs 55 out of 100).
7136-OChoose it when the part sees heat.
7136-W51Choose it when strength drives the design, or when surface hardness matters.
7136-O vs 7136-W51: 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)
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 26.9 GPa3.9 Msi · Bulk Modulus 70 GPa10.2 Msi · Poisson's Ratio 0.33 · Elongation at Break 16%
Physical
Density and transition temperatures.
Same in both: Density 2.85 g/cm³0.1 lb/in³ · Melting Point (Solidus) 477°C891 °F · Liquidus Temperature 635°C1,175 °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 860 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.4 µm/m·K13 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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.8 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: Brazeability / Solderability 8 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 205 MJ/kg88,134 BTU/lb · Embodied Carbon (primary production) 12.5 kg CO₂/kg · Embodied Water 1,150 L/kg138 gal/lb · Typical Recycled Content 10%
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.
7136-O vs 7136-W51 — frequently asked
Is 7136-W51 stronger than 7136-O?
Yes. 7136-W51 has a typical yield strength of 250 MPa (36.3 ksi) against 110 MPa (16 ksi) for 7136-O — about 127% more. Tensile strength is 400 MPa (58 ksi) vs 235 MPa (34.1 ksi).
Which condition does FabDigit quote by default, O or W51?
T76511 is the default 7136 condition in the FabDigit quote flow (neither O nor W51). 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, 7136-O or 7136-W51?
7136-W51, by a small margin. Both rate fair for machinability — 50/100 against 45/100 for 7136-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7136-O and 7136-W51 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.