Aluminum 4045-H24 vs 4045-O
Aluminum · 4045 temper comparison
4045-H24 and 4045-O are two conditions of the same aluminum grade, 4045: H24 (strain hardened and partially annealed, half hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 4045-H24 is the stronger of the two: yield strength 125 MPa (18.1 ksi) against 45 MPa (6.53 ksi) for 4045-O, about 178% more; tensile strength follows at 155 MPa (22.5 ksi) vs 110 MPa (16 ksi). In exchange, 4045-O is the more ductile: elongation 20% versus 8% for 4045-H24, and 4045-H24 is harder (43 HB vs 30 HB). 4045-O runs hotter in service (150°C vs 130°C continuous).
4045-H24Choose it when strength drives the design.
4045-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
4045-H24 vs 4045-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
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 72 GPa10.4 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.67 g/cm³0.1 lb/in³ · Melting Point (Solidus) 577°C1,071 °F · Liquidus Temperature 591°C1,096 °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) 21 µm/m·K11.7 µin/in·°F · Latent Heat of Fusion 490 J/g211 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 4.3×10⁻⁸ Ω·m1.69 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.83 V · Corrosion Resistance 48 / 100
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: Castability 88 / 100 · Brazeability / Solderability 98 / 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 1,100 L/kg132 gal/lb · Typical Recycled Content 35%
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.
4045-H24 vs 4045-O — frequently asked
Is 4045-H24 stronger than 4045-O?
Yes. 4045-H24 has a typical yield strength of 125 MPa (18.1 ksi) against 45 MPa (6.53 ksi) for 4045-O — about 178% more. Tensile strength is 155 MPa (22.5 ksi) vs 110 MPa (16 ksi).
Which condition does FabDigit quote by default, H24 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, 4045-H24 or 4045-O?
4045-H24, by a small margin. Both rate fair for machinability — 41/100 against 35/100 for 4045-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4045-H24 and 4045-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.