Aluminum 2117-O vs 2117-T4
Aluminum · 2117 temper comparison
2117-O and 2117-T4 are two conditions of the same aluminum grade, 2117: O (annealed) versus T4 (solution heat treated and naturally aged). The chemistry is identical, so every difference below comes from the condition. 2117-T4 is the stronger of the two: yield strength 165 MPa (23.9 ksi) against 70 MPa (10.2 ksi) for 2117-O, about 136% more; tensile strength follows at 295 MPa (42.8 ksi) vs 170 MPa (24.7 ksi). In exchange, 2117-O is the more ductile: elongation 30% versus 27% for 2117-T4, and 2117-T4 is harder (70 HB vs 40 HB). 2117-O conducts heat better (180 W/m·K vs 151 W/m·K). On the shop floor, 2117-T4 machines more easily (good vs fair).
2117-OChoose it when the part is bent, formed or impact-loaded.
2117-T4Choose it when strength drives the design, or when the part is machined in volume.
2117-O vs 2117-T4: 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
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 70.3 GPa10.2 Msi · Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 74 GPa10.7 Msi · Poisson's Ratio 0.33 · Fatigue Strength (Endurance Limit) 95 MPa13.8 ksi
Physical
Density and transition temperatures.
Same in both: Density 2.75 g/cm³0.1 lb/in³ · Melting Point (Solidus) 554°C1,029 °F · Liquidus Temperature 650°C1,202 °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) 23.8 µm/m·K13.2 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Max Service Temperature (continuous) 120°C248 °F · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 4.31×10⁻⁸ Ω·m1.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.64 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Weldability 20 / 100 · Brazeability / Solderability 15 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 155 MJ/kg66,638 BTU/lb · Embodied Carbon (primary production) 12 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.
2117-O vs 2117-T4 — frequently asked
Is 2117-T4 stronger than 2117-O?
Yes. 2117-T4 has a typical yield strength of 165 MPa (23.9 ksi) against 70 MPa (10.2 ksi) for 2117-O — about 136% more. Tensile strength is 295 MPa (42.8 ksi) vs 170 MPa (24.7 ksi).
Which condition does FabDigit quote by default, O or T4?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
Which is easier to machine, 2117-O or 2117-T4?
2117-T4. Its machinability rates good (65/100) against fair (45/100) for 2117-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 2117-O and 2117-T4 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.