Aluminum 1199-H18 vs 1199-O
Aluminum · 1199 temper comparison
1199-H18 and 1199-O are two conditions of the same aluminum grade, 1199: H18 (strain hardened, full hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 1199-H18 is the stronger of the two: yield strength 105 MPa (15.2 ksi) against 12 MPa (1.74 ksi) for 1199-O, about 8.8 times as much; tensile strength follows at 115 MPa (16.7 ksi) vs 45 MPa (6.53 ksi). In exchange, 1199-O is the more ductile: elongation 50% versus 4% for 1199-H18, and 1199-H18 is harder (30 HB vs 13 HB). 1199-O runs hotter in service (150°C vs 80°C continuous). On the shop floor, 1199-H18 machines more easily (30 vs 20 out of 100).
1199-H18Choose it when strength drives the design, or when the part is machined in volume.
1199-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1199-H18 vs 1199-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 62 GPa9 Msi · Shear Modulus 25 GPa3.6 Msi · Bulk Modulus 75 GPa10.9 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.7 g/cm³0.1 lb/in³ · Melting Point (Solidus) 660°C1,220 °F · Liquidus Temperature 660°C1,221 °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 -269°C-452 °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) -0.85 V · Corrosion Resistance 82 / 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 90 / 100 · Castability 45 / 100 · Brazeability / Solderability 88 / 100 · Polishability 95 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 230 MJ/kg98,882 BTU/lb · Embodied Carbon (primary production) 14 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 0%
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.
1199-H18 vs 1199-O — frequently asked
Is 1199-H18 stronger than 1199-O?
Yes. 1199-H18 has a typical yield strength of 105 MPa (15.2 ksi) against 12 MPa (1.74 ksi) for 1199-O — about 8.8 times as much. Tensile strength is 115 MPa (16.7 ksi) vs 45 MPa (6.53 ksi).
Which condition does FabDigit quote by default, H18 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, 1199-H18 or 1199-O?
1199-H18, by a small margin. Both rate poor for machinability — 30/100 against 20/100 for 1199-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1199-H18 and 1199-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.