Aluminum 6253-F vs 6253-T61
Aluminum · 6253 temper comparison
6253-F and 6253-T61 are two conditions of the same aluminum grade, 6253: F (as fabricated) versus T61 (T6 variant, underaged). The chemistry is identical, so every difference below comes from the condition. 6253-T61 is the stronger of the two: yield strength 145 MPa (21 ksi) against 90 MPa (13.1 ksi) for 6253-F, about 61% more; tensile strength follows at 220 MPa (31.9 ksi) vs 160 MPa (23.2 ksi). In exchange, 6253-F is the more ductile: elongation 20% versus 18% for 6253-T61, and 6253-T61 is harder (65 HB vs 45 HB). 6253-F conducts heat better (180 W/m·K vs 162 W/m·K). On the shop floor, 6253-T61 machines more easily (good vs fair) and 6253-F welds better (very good vs good).
6253-FChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
6253-T61Choose it when strength drives the design, or when the part is machined in volume.
6253-F vs 6253-T61: 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)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 69 GPa10 Msi · Shear Modulus 26 GPa3.8 Msi · Bulk Modulus 69 GPa10 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.71 g/cm³0.1 lb/in³ · Melting Point (Solidus) 590°C1,094 °F · Liquidus Temperature 650°C1,202 °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 895 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 395 J/g170 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) -0.9 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 50 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 13 kg CO₂/kg · Embodied Water 1,150 L/kg138 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.
6253-F vs 6253-T61 — frequently asked
Is 6253-T61 stronger than 6253-F?
Yes. 6253-T61 has a typical yield strength of 145 MPa (21 ksi) against 90 MPa (13.1 ksi) for 6253-F — about 61% more. Tensile strength is 220 MPa (31.9 ksi) vs 160 MPa (23.2 ksi).
Which condition does FabDigit quote by default, F or T61?
T6 is the default 6253 condition in the FabDigit quote flow (neither F nor T61). 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, 6253-F or 6253-T61?
6253-T61. Its machinability rates good (58/100) against fair (45/100) for 6253-F; for welding the order is 6253-F first (very good, 75/100) then 6253-T61 (good, 65/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 6253-F and 6253-T61 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.