Aluminum 6351-H111 vs 6351-T4
Aluminum · 6351 temper comparison
6351-H111 and 6351-T4 are two conditions of the same aluminum grade, 6351: H111 (slightly strain hardened) versus T4 (solution heat treated and naturally aged). The chemistry is identical, so every difference below comes from the condition. 6351-T4 is the stronger of the two: yield strength 150 MPa (21.8 ksi) against 70 MPa (10.2 ksi) for 6351-H111, about 114% more; tensile strength follows at 250 MPa (36.3 ksi) vs 130 MPa (18.9 ksi). 6351-T4 is harder — 65 HB against 35 HB for 6351-H111 — which matters for wear surfaces and threads. 6351-H111 runs hotter in service (200°C vs 100°C continuous) and 6351-H111 conducts heat better (196 W/m·K vs 154 W/m·K). On the shop floor, 6351-T4 machines more easily (fair vs poor) and 6351-H111 forms better (excellent vs good).
6351-H111Choose it when the part sees heat.
6351-T4Choose it when strength drives the design, or when surface hardness matters.
6351-H111 vs 6351-T4: 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)
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 · Fracture Toughness (K_IC) 29 MPa·√m26.4 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 2.71 g/cm³0.1 lb/in³ · Melting Point (Solidus) 555°C1,031 °F · Liquidus Temperature 650°C1,202 °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
Same in both: Castability 30 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 1,150 L/kg138 gal/lb
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.
6351-H111 vs 6351-T4 — frequently asked
Is 6351-T4 stronger than 6351-H111?
Yes. 6351-T4 has a typical yield strength of 150 MPa (21.8 ksi) against 70 MPa (10.2 ksi) for 6351-H111 — about 114% more. Tensile strength is 250 MPa (36.3 ksi) vs 130 MPa (18.9 ksi).
Which condition does FabDigit quote by default, H111 or T4?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
Which is easier to machine, 6351-H111 or 6351-T4?
6351-T4. Its machinability rates fair (48/100) against poor (30/100) for 6351-H111.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 6351-H111 and 6351-T4 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.