Aluminum 4043-F vs 4043-O
Aluminum · 4043 temper comparison
4043-F and 4043-O are two conditions of the same aluminum grade, 4043: F (as fabricated) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 4043-F is the stronger of the two: yield strength 120 MPa (17.4 ksi) against 55 MPa (7.98 ksi) for 4043-O, about 118% more; tensile strength follows at 180 MPa (26.1 ksi) vs 145 MPa (21 ksi). In exchange, 4043-O is the more ductile: elongation 22% versus 12% for 4043-F, and 4043-F is harder (50 HB vs 40 HB).
4043-FChoose it when strength drives the design.
4043-OChoose it when the part is bent, formed or impact-loaded.
4043-F vs 4043-O: 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 69 GPa10 Msi · Shear Modulus 26 GPa3.8 Msi · Bulk Modulus 70 GPa10.2 Msi · Poisson's Ratio 0.33 · Fatigue Strength (Endurance Limit) 55 MPa8 ksi
Physical
Density and transition temperatures.
Same in both: Density 2.68 g/cm³0.1 lb/in³ · Melting Point (Solidus) 574°C1,065 °F · Liquidus Temperature 632°C1,170 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 163 W/m·K94.2 BTU/hr·ft·°F · Specific Heat Capacity 900 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 22 µm/m·K12.2 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 42 % IACS · Electrical Resistivity 4.1×10⁻⁸ Ω·m1.61 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.83 V · Corrosion Resistance 58 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 30% · Weldability 95 / 100 · Castability 85 / 100 · Brazeability / Solderability 80 / 100 · Polishability 40 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 12 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 30%
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.
4043-F vs 4043-O — frequently asked
Is 4043-F stronger than 4043-O?
Yes. 4043-F has a typical yield strength of 120 MPa (17.4 ksi) against 55 MPa (7.98 ksi) for 4043-O — about 118% more. Tensile strength is 180 MPa (26.1 ksi) vs 145 MPa (21 ksi).
Which condition does FabDigit quote by default, F or O?
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, 4043-F or 4043-O?
4043-F, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for 4043-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4043-F and 4043-O 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.