Aluminum EN AC-21100-T4 vs EN AC-21100-T7
Aluminum · EN AC-21100 temper comparison
EN AC-21100-T4 and EN AC-21100-T7 are two conditions of the same aluminum grade, EN AC-21100: T4 (solution heat treated and naturally aged) versus T7 (solution heat treated and overaged (stabilized)). The chemistry is identical, so every difference below comes from the condition. EN AC-21100-T7 is the stronger of the two: yield strength 200 MPa (29 ksi) against 165 MPa (23.9 ksi) for EN AC-21100-T4, about 21% more. In exchange, EN AC-21100-T4 is the more ductile: elongation 14% versus 5% for EN AC-21100-T7, and EN AC-21100-T7 is harder (85 HB vs 75 HB). EN AC-21100-T7 runs hotter in service (230°C vs 120°C continuous) and EN AC-21100-T7 conducts heat better (150 W/m·K vs 130 W/m·K). On the shop floor, EN AC-21100-T7 machines more easily (excellent vs very good).
EN AC-21100-T4Choose it when the part is bent, formed or impact-loaded.
EN AC-21100-T7Choose it when strength drives the design, or when the part sees heat.
EN AC-21100-T4 vs EN AC-21100-T7: 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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Shear Modulus 27 GPa3.9 Msi · Bulk Modulus 71 GPa10.3 Msi · Poisson's Ratio 0.33 · Fatigue Strength (Endurance Limit) 85 MPa12.3 ksi
Physical
Density and transition temperatures.
Same in both: Density 2.75 g/cm³0.1 lb/in³ · Melting Point (Solidus) 545°C1,013 °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 900 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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.69 V
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 40 / 100 · Brazeability / Solderability 20 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 150 MJ/kg64,488 BTU/lb · Embodied Carbon (primary production) 9.5 kg CO₂/kg · Embodied Water 1,100 L/kg132 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.
EN AC-21100-T4 vs EN AC-21100-T7 — frequently asked
Is EN AC-21100-T7 stronger than EN AC-21100-T4?
Yes. EN AC-21100-T7 has a typical yield strength of 200 MPa (29 ksi) against 165 MPa (23.9 ksi) for EN AC-21100-T4 — about 21% more. Tensile strength is 260 MPa (37.7 ksi) vs 290 MPa (42.1 ksi).
Which condition does FabDigit quote by default, T4 or T7?
T6 is the default EN AC-21100 condition in the FabDigit quote flow (neither T4 nor T7). 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, EN AC-21100-T4 or EN AC-21100-T7?
EN AC-21100-T7. Its machinability rates excellent (85/100) against very good (75/100) for EN AC-21100-T4.
Ready to make it?
Upload a CAD file and FabDigit prices the part in EN AC-21100-T4 and EN AC-21100-T7 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.