Aluminum AC2A vs AC9A
Aluminum · grade comparison
Aluminum AC2A and AC9A are both aluminum grades. AC9A is the stronger of the two: yield strength 190 MPa (27.6 ksi) against 170 MPa (24.7 ksi) for AC2A, about 12% more. In exchange, AC2A is the more ductile: elongation 2% versus 0.4% for AC9A, and AC9A is harder (135 HB vs 85 HB). AC9A is lighter (2.66 g/cm³ vs 2.79 g/cm³ for AC2A) and AC9A is stiffer (88 GPa vs 74 GPa). On the shop floor, AC2A machines more easily (very good vs poor) and AC2A welds better (fair vs poor).
AC2AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
AC9AChoose it when strength drives the design, or when weight is the constraint.
AC2A vs AC9A: 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.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Reduction in Area
Compressive Strength
Hardness, Rockwell B
Hardness, Vickers
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Same in both: Brazeability / Solderability 25 / 100 · Polishability 40 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Same in both: Thermal Shock Resistance Index 17
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.
Manufacturing and finishing
| Capability | AC2A | AC9A |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 4 finishes: Electroless Nickel (EN), Epoxy Coating, Gold Plating, Silver Plating.
AC2A vs AC9A — frequently asked
Is AC9A stronger than AC2A?
Yes. AC9A has a typical yield strength of 190 MPa (27.6 ksi) against 170 MPa (24.7 ksi) for AC2A — about 12% more. Tensile strength is 210 MPa (30.5 ksi) vs 250 MPa (36.3 ksi).
Which is cheaper, AC2A or AC9A?
Both sit in the same relative cost tier ($$, standard); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, AC2A or AC9A?
AC2A. Its machinability rates very good (72/100) against poor (25/100) for AC9A; for welding the order is AC2A first (fair, 35/100) then AC9A (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in AC2A and AC9A 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.