Aluminum Hokotol-T651 vs Hokotol-T7451
Aluminum · Hokotol temper comparison
Hokotol-T651 and Hokotol-T7451 are two conditions of the same aluminum grade, Hokotol: T651 (T6, stress relieved by stretching) versus T7451 (T74, stress relieved by stretching). The chemistry is identical, so every difference below comes from the condition. Hokotol-T651 is the stronger of the two: yield strength 505 MPa (73.2 ksi) against 460 MPa (66.7 ksi) for Hokotol-T7451, about 10% more; tensile strength follows at 565 MPa (81.9 ksi) vs 525 MPa (76.1 ksi). In exchange, Hokotol-T7451 is the more ductile: elongation 7% versus 5% for Hokotol-T651, and Hokotol-T651 is harder (172 HB vs 155 HB). Hokotol-T7451 runs hotter in service (130°C vs 100°C continuous) and Hokotol-T7451 conducts heat better (157 W/m·K vs 130 W/m·K).
Hokotol-T651Choose it when strength drives the design.
Hokotol-T7451Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Hokotol-T651 vs Hokotol-T7451: 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)
Elongation at Break
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 26.9 GPa3.9 Msi · Bulk Modulus 74 GPa10.7 Msi · Poisson's Ratio 0.33 · Compressive Strength 490 MPa71.1 ksi · Shear Strength 320 MPa46.4 ksi
Physical
Density and transition temperatures.
Same in both: Density 2.82 g/cm³0.1 lb/in³ · Melting Point (Solidus) 477°C891 °F · Liquidus Temperature 635°C1,175 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 860 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.4 µm/m·K13 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 4.4×10⁻⁸ Ω·m1.73 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.84 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 90% · Weldability 18 / 100 · Formability (cold) 18 / 100 · Brazeability / Solderability 10 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 155 MJ/kg66,638 BTU/lb · Embodied Carbon (primary production) 12 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 25%
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.
Hokotol-T651 vs Hokotol-T7451 — frequently asked
Is Hokotol-T651 stronger than Hokotol-T7451?
Yes. Hokotol-T651 has a typical yield strength of 505 MPa (73.2 ksi) against 460 MPa (66.7 ksi) for Hokotol-T7451 — about 10% more. Tensile strength is 565 MPa (81.9 ksi) vs 525 MPa (76.1 ksi).
Which condition does FabDigit quote by default, T651 or T7451?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
When should I choose Hokotol-T651 over Hokotol-T7451?
Pick Hokotol-T651 when strength drives the design. Pick Hokotol-T7451 when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Hokotol-T651 and Hokotol-T7451 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.