Aluminum 4045 vs 4343
Aluminum · grade comparison
Aluminum 4045 and 4343 are both aluminum grades, both heat resistant al. 4343 is the stronger of the two: yield strength 55 MPa (7.98 ksi) against 45 MPa (6.53 ksi) for 4045, about 22% more; tensile strength follows at 130 MPa (18.9 ksi) vs 110 MPa (16 ksi). 4343 is harder — 40 HB against 30 HB for 4045 — which matters for wear surfaces and threads. On the shop floor, 4045 welds better (very good vs good) and 4045 forms better (very good vs good).
4045Choose it when it will be welded.
4343Choose it when strength drives the design, or when surface hardness matters.
4045 vs 4343: 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
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Shear Strength
Hardness, Brinell
Same in both: Poisson's Ratio 0.33 · Elongation at Break 20% · Fatigue Strength (Endurance Limit) 50 MPa7.3 ksi
Physical
Density and transition temperatures.
Density
Liquidus Temperature
Same in both: Melting Point (Solidus) 577°C1,071 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Min Service Temperature
Same in both: Specific Heat Capacity 900 J/kg·K0.21 BTU/lb·°F · Max Service Temperature (continuous) 150°C302 °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
Weldability
Formability (cold)
Castability
Polishability
Same in both: Machinability Rating (AISI 1212 = 100 %) 30% · Brazeability / Solderability 98 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 12 kg CO₂/kg
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
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 | 4045 | 4343 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both are offered for Sheet metal. Both take the same 15 finishes: Anodizing Type II, Cerakote, Chem Film (Alodine), E-Coating, Electroless Nickel (EN), Electropolishing, Epoxy Coating, Gold Plating, Hard Anodize Type III w/ PTFE, Hard Anodizing Type III, Nickel Plating, PTFE Coating and 3 more.
4045 vs 4343 — frequently asked
Is 4343 stronger than 4045?
Yes. 4343 has a typical yield strength of 55 MPa (7.98 ksi) against 45 MPa (6.53 ksi) for 4045 — about 22% more. Tensile strength is 130 MPa (18.9 ksi) vs 110 MPa (16 ksi).
Which is cheaper, 4045 or 4343?
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, 4045 or 4343?
4045. Its machinability rates fair (38/100) against poor (32/100) for 4343; for welding the order is 4045 first (very good, 70/100) then 4343 (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4045 and 4343 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.