Aluminum 4007-H28 vs 4007-O
Aluminum · 4007 temper comparison
4007-H28 and 4007-O are two conditions of the same aluminum grade, 4007: H28 (strain hardened and partially annealed, full hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 4007-H28 is the stronger of the two: yield strength 220 MPa (31.9 ksi) against 65 MPa (9.43 ksi) for 4007-O, about 3.4 times as much; tensile strength follows at 245 MPa (35.5 ksi) vs 150 MPa (21.8 ksi). In exchange, 4007-O is the more ductile: elongation 27% versus 3% for 4007-H28, and 4007-H28 is harder (68 HB vs 42 HB). 4007-O runs hotter in service (175°C vs 110°C continuous). On the shop floor, 4007-H28 machines more easily (good vs fair).
4007-H28Choose it when strength drives the design, or when the part is machined in volume.
4007-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
4007-H28 vs 4007-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
Compressive Strength
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 72 GPa10.4 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.73 g/cm³0.1 lb/in³ · Melting Point (Solidus) 625°C1,157 °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) 22 µm/m·K12.2 µin/in·°F · Latent Heat of Fusion 393 J/g169 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) -0.83 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 70 / 100 · Brazeability / Solderability 80 / 100 · Polishability 45 / 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 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.
4007-H28 vs 4007-O — frequently asked
Is 4007-H28 stronger than 4007-O?
Yes. 4007-H28 has a typical yield strength of 220 MPa (31.9 ksi) against 65 MPa (9.43 ksi) for 4007-O — about 3.4 times as much. Tensile strength is 245 MPa (35.5 ksi) vs 150 MPa (21.8 ksi).
Which condition does FabDigit quote by default, H28 or O?
O is the default 4007 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, 4007-H28 or 4007-O?
4007-H28. Its machinability rates good (64/100) against fair (45/100) for 4007-O; for welding the order is 4007-O first (good, 62/100) then 4007-H28 (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4007-H28 and 4007-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.