Aluminum 7003 vs 7108
Aluminum · grade comparison
Aluminum 7003 and 7108 are both aluminum grades. 7108 is the stronger of the two: yield strength 340 MPa (49.3 ksi) against 315 MPa (45.7 ksi) for 7003, about 8% more. 7108 is harder — 118 HV against 112 HV for 7003 — which matters for wear surfaces and threads. 7003 conducts electricity better (39 % IACS vs 33 % IACS). On the shop floor, 7108 forms better (45 vs 35 out of 100) and 7003 sits in a lower cost tier (standard, $$) than 7108 (premium, $$$).
7003Choose it when cost is the deciding factor.
7108Choose it when strength drives the design, or when surface hardness matters.
7003 vs 7108: 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)
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 26.5 GPa3.8 Msi · Bulk Modulus 71 GPa10.3 Msi · Poisson's Ratio 0.33 · Elongation at Break 11% · Fracture Toughness (K_IC) 28 MPa·√m25.5 ksi·√in
Physical
Density and transition temperatures.
Melting Point (Solidus)
Same in both: Density 2.78 g/cm³0.1 lb/in³ · Liquidus Temperature 645°C1,193 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Same in both: Latent Heat of Fusion 390 J/g168 BTU/lb · Max Service Temperature (continuous) 120°C248 °F · 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) -0.86 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Brazeability / Solderability
Polishability
Castability
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)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 25.2 MN·m/kg
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 | 7003 | 7108 |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Default condition | — | — |
| Relative cost | $$ Standard | $$$ Premium |
| Min. machined wall | 0.5 mm | — |
| Best machined surface | Ra 0.8 µm | — |
| Anodizing Type II | Yes | — |
| Cerakote | Yes | — |
| Chem Film (Alodine) | Yes | — |
| DLC | Yes | — |
| E-Coating | Yes | — |
| Electropolishing | Yes | — |
| Hard Anodize Type III w/ PTFE | Yes | — |
| Hard Anodizing Type III | Yes | — |
| Nickel Plating | Yes | — |
| PTFE Coating | Yes | — |
| Painting | Yes | — |
| Powder Coating | Yes | — |
They share 4 finishes: Electroless Nickel (EN), Epoxy Coating, Gold Plating, Silver Plating.
7003 vs 7108 — frequently asked
Is 7108 stronger than 7003?
Yes. 7108 has a typical yield strength of 340 MPa (49.3 ksi) against 315 MPa (45.7 ksi) for 7003 — about 8% more. Tensile strength is 370 MPa (53.7 ksi) vs 360 MPa (52.2 ksi).
Which is cheaper, 7003 or 7108?
7003 is the lower-cost material: it sits in the standard tier ($$) while 7108 is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, 7003 or 7108?
7003, by a small margin. Both rate good for machinability — 65/100 against 60/100 for 7108; for welding the order is 7108 first (very good, 80/100) then 7003 (very good, 75/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7003 and 7108 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.