Aluminum 6005 vs 6951
Aluminum · grade comparison
Aluminum 6005 and 6951 are both aluminum grades. 6005 is the stronger of the two: yield strength 245 MPa (35.5 ksi) against 41 MPa (5.95 ksi) for 6951, about 6.0 times as much; tensile strength follows at 270 MPa (39.2 ksi) vs 110 MPa (16 ksi). In exchange, 6951 is the more ductile: elongation 30% versus 11% for 6005, and 6005 is harder (85 HB vs 28 HB). 6951 runs hotter in service (200°C vs 150°C continuous). On the shop floor, 6005 machines more easily (good vs fair) and 6005 sits in a lower cost tier (standard, $$) than 6951 (premium, $$$).
6005Choose it when strength drives the design, or when the part is machined in volume.
6951Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
6005 vs 6951: 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.
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 69 GPa10 Msi · Shear Modulus 26 GPa3.8 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Melting Point (Solidus)
Same in both: Density 2.7 g/cm³0.1 lb/in³ · Liquidus Temperature 654°C1,209 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Thermal Expansion (CTE, 20–100 °C) 23.4 µm/m·K13 µin/in·°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).
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)
Brazeability / Solderability
Polishability
Castability
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Typical Recycled Content 30%
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) 25.6 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 | 6005 | 6951 |
|---|---|---|
| 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.
6005 vs 6951 — frequently asked
Is 6005 stronger than 6951?
Yes. 6005 has a typical yield strength of 245 MPa (35.5 ksi) against 41 MPa (5.95 ksi) for 6951 — about 6.0 times as much. Tensile strength is 270 MPa (39.2 ksi) vs 110 MPa (16 ksi).
Which is cheaper, 6005 or 6951?
6005 is the lower-cost material: it sits in the standard tier ($$) while 6951 is premium ($$$). 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, 6005 or 6951?
6005. Its machinability rates good (55/100) against fair (40/100) for 6951; for welding the order is 6005 first (very good, 80/100) then 6951 (very good, 72/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 6005 and 6951 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.