Materials / Compare
Aluminum 2024-T351 vs. Plastic Nylon PA66
Compare Aluminum 2024-T351 vs. Plastic Nylon PA66 strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 324MPasourcetypical, 0.2% offset, .500 in dia specimen | 85MPasourcetypical, dry |
| Ultimate tensile strength | 469MPasourcetypical | not sourced |
| Elongation at break | 19%sourcetypical, in 4D | 30%sourcenominal strain at break, dry |
| Young's modulus (stiffness) | 73.1GPasourcetypical | 3GPasourcetypical, dry |
| Density | 2,770kg/m³sourcenominal | 1,130kg/m³sourcetypical |
| Strength to weight | 117kN·m/kg1.55x higher | 75.2kN·m/kg |
| Stiffness to weight | 26.4MN·m/kg9.94x higher | 2.65MN·m/kg |
| Poisson's ratio | 0.33sourcetypical (handbook physical constant), all tempers | 0.4sourcebase material: unfilled polyamide (PA), conditioned, maker design-guide family value (Covestro Table 3-1) |
| Shear modulus | 27.5GPa25.6x stiffer in shear | 1.07GPa |
| Bulk modulus | 71.7GPa | 5GPa |
| Speed of sound | 5,137m/s | 1,629m/s |
| Thermal | ||
| Thermal conductivity | 120W/m·Ksourcetypical, 20 °C | 0.33W/m·Ksourcetypical |
| Thermal expansion | 22.9µm/m·Ksourcetypical, mean 20-100 °C | 98µm/m·Ksourcelongitudinal, 23-55 °C |
| 100 mm part over a 50 °C swing | 115µm growth4.28x less | 490µm growth |
| Specific heat | 875J/kg·Ksourcetypical, at 100 °C | 1,700J/kg·Ksourcetypical |
| Heats up and cools (diffusivity) | 49.5mm²/s288x faster | 0.172mm²/s |
| Thermal shock resistance | 15,561W/m272x more resistant | 57.2W/m |
| Melting point | 502–638°Csourcemelting range | 260°CsourceDSC |
| Max service temperature | not sourced | 101°CsourceIEC 60216 temperature index, 20000 h |
| Values for | 2024-T4/T351, Kaiser Aluminum sheet, coil & plate typical datasheet; Poisson from MIL-HDBK-5J | BASF Ultramid A3K (PA66, unreinforced injection-moulding grade), Product Information 02/2026, dry values (ISO methods) |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Aluminum 2024-T351 stronger than Plastic Nylon PA66?
Aluminum 2024-T351 is stronger: its yield strength is 324 MPa against 85 MPa for Plastic Nylon PA66 (3.81x).
Which is lighter, Aluminum 2024-T351 or Plastic Nylon PA66?
Plastic Nylon PA66 is lighter: 1,130 kg/m³ against 2,770 kg/m³ for Aluminum 2024-T351.
Which is stiffer, Aluminum 2024-T351 or Plastic Nylon PA66?
Aluminum 2024-T351 is stiffer: Young's modulus 73.1 GPa against 3 GPa for Plastic Nylon PA66, so the same part in Aluminum 2024-T351 deflects less under the same load.
Which is lighter for the same job, Aluminum 2024-T351 or Plastic Nylon PA66?
For the same stiffness or strength: Aluminum 2024-T351 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie; Plastic Nylon PA66 is lighter for a strong panel or plate.
| Part that must be | Aluminum 2024-T351 | Plastic Nylon PA66 |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 9.94x heavier |
| Stiff beam (bending) | lighter | 2.01x heavier |
| Stiff panel or plate | lighter | 18% heavier |
| Strong rod or tie | lighter | 1.55x heavier |
| Strong beam | about equal | about equal |
| Strong panel or plate | 26% heavier | lighter |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Aluminum 2024-T351 or Plastic Nylon PA66?
Aluminum 2024-T351 conducts heat better: 120 W/m·K against 0.33 W/m·K for Plastic Nylon PA66.
Which expands less with temperature?
Aluminum 2024-T351 expands less: 22.9 µm/m·K against 98 µm/m·K for Plastic Nylon PA66.