Aluminum 1235-H16 vs 1235-O
Aluminum · 1235 temper comparison
1235-H16 and 1235-O are two conditions of the same aluminum grade, 1235: H16 (strain hardened, three-quarter hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 1235-H16 is the stronger of the two: yield strength 120 MPa (17.4 ksi) against 30 MPa (4.35 ksi) for 1235-O, about 4.0 times as much; tensile strength follows at 135 MPa (19.6 ksi) vs 80 MPa (11.6 ksi). In exchange, 1235-O is the more ductile: elongation 32% versus 5% for 1235-H16, and 1235-H16 is harder (35 HB vs 21 HB). 1235-O runs hotter in service (150°C vs 110°C continuous).
1235-H16Choose it when strength drives the design.
1235-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1235-H16 vs 1235-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 69 GPa10 Msi · Shear Modulus 26 GPa3.8 Msi · Bulk Modulus 68 GPa9.9 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.71 g/cm³0.1 lb/in³ · Melting Point (Solidus) 646°C1,195 °F · Liquidus Temperature 657°C1,215 °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) 23.6 µm/m·K13.1 µin/in·°F · Latent Heat of Fusion 397 J/g171 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).
Same in both: Galvanic Potential (seawater, vs SCE) -0.79 V · Corrosion Resistance 78 / 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 35 / 100 · Brazeability / Solderability 75 / 100 · Polishability 55 / 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 20%
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.
1235-H16 vs 1235-O — frequently asked
Is 1235-H16 stronger than 1235-O?
Yes. 1235-H16 has a typical yield strength of 120 MPa (17.4 ksi) against 30 MPa (4.35 ksi) for 1235-O — about 4.0 times as much. Tensile strength is 135 MPa (19.6 ksi) vs 80 MPa (11.6 ksi).
Which condition does FabDigit quote by default, H16 or O?
O is the default 1235 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, 1235-H16 or 1235-O?
1235-H16, by a small margin. Both rate poor for machinability — 31/100 against 25/100 for 1235-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1235-H16 and 1235-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.