Aluminum 4015-H26 vs 4015-O
Aluminum · 4015 temper comparison
4015-H26 and 4015-O are two conditions of the same aluminum grade, 4015: H26 (strain hardened and partially annealed, three-quarter hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 4015-H26 is the stronger of the two: yield strength 148 MPa (21.5 ksi) against 55 MPa (7.98 ksi) for 4015-O, about 169% more; tensile strength follows at 178 MPa (25.8 ksi) vs 120 MPa (17.4 ksi). In exchange, 4015-O is the more ductile: elongation 26% versus 6% for 4015-H26, and 4015-H26 is harder (49 HB vs 31 HB). 4015-O runs hotter in service (175°C vs 110°C continuous). On the shop floor, 4015-H26 machines more easily (fair vs poor) and 4015-O welds better (excellent vs very good).
4015-H26Choose it when strength drives the design, or when the part is machined in volume.
4015-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
4015-H26 vs 4015-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
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 70 GPa10.2 Msi · Shear Modulus 26.4 GPa3.8 Msi · Bulk Modulus 73 GPa10.6 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.69 g/cm³0.1 lb/in³ · Melting Point (Solidus) 630°C1,166 °F · Liquidus Temperature 655°C1,211 °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) 23.2 µm/m·K12.9 µin/in·°F · Latent Heat of Fusion 393 J/g169 BTU/lb · Min Service Temperature -270°C-454 °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) -0.76 V
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 55 / 100 · Brazeability / Solderability 90 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 12.5 kg CO₂/kg · Embodied Water 1,150 L/kg138 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.
4015-H26 vs 4015-O — frequently asked
Is 4015-H26 stronger than 4015-O?
Yes. 4015-H26 has a typical yield strength of 148 MPa (21.5 ksi) against 55 MPa (7.98 ksi) for 4015-O — about 169% more. Tensile strength is 178 MPa (25.8 ksi) vs 120 MPa (17.4 ksi).
Which condition does FabDigit quote by default, H26 or O?
O is the default 4015 condition in the FabDigit quote flow. 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, 4015-H26 or 4015-O?
4015-H26. Its machinability rates fair (48/100) against poor (32/100) for 4015-O; for welding the order is 4015-O first (excellent, 88/100) then 4015-H26 (very good, 78/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4015-H26 and 4015-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.