Copper Alloy C43400-H04 vs C43400-H08
Copper Alloy · C43400 temper comparison
C43400-H04 and C43400-H08 are two conditions of the same copper alloy grade, C43400: H04 (full hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. C43400-H08 is the stronger of the two: yield strength 565 MPa (81.9 ksi) against 475 MPa (68.9 ksi) for C43400-H04, about 19% more; tensile strength follows at 634 MPa (92 ksi) vs 545 MPa (79 ksi). In exchange, C43400-H04 is the more ductile: elongation 5% versus 3% for C43400-H08, and C43400-H08 is harder (205 HV vs 180 HV).
C43400-H04Choose it when the part is bent, formed or impact-loaded.
C43400-H08Choose it when strength drives the design.
C43400-H04 vs C43400-H08: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all copper alloy 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 copper alloy 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
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 110 GPa16 Msi · Shear Modulus 41 GPa5.9 Msi · Bulk Modulus 112 GPa16.2 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.75 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,000°C1,832 °F · Liquidus Temperature 1,030°C1,886 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 121 W/m·K69.9 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 19.8 µm/m·K11 µin/in·°F · Latent Heat of Fusion 195 J/g83.8 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 6.6×10⁻⁸ Ω·m2.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V · Corrosion Resistance 62 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Machinability 32 / 100 · Weldability 55 / 100 · Brazeability / Solderability 90 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 62 MJ/kg26,655 BTU/lb · Embodied Carbon (primary production) 4 kg CO₂/kg · Embodied Water 320 L/kg38.3 gal/lb · Typical Recycled Content 45%
Strength versus weight
Yield strength against density for every copper alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
C43400-H04 vs C43400-H08 — frequently asked
Is C43400-H08 stronger than C43400-H04?
Yes. C43400-H08 has a typical yield strength of 565 MPa (81.9 ksi) against 475 MPa (68.9 ksi) for C43400-H04 — about 19% more. Tensile strength is 634 MPa (92 ksi) vs 545 MPa (79 ksi).
Which condition does FabDigit quote by default, H04 or H08?
H02 is the default C43400 condition in the FabDigit quote flow (neither H04 nor H08). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
When should I choose C43400-H04 over C43400-H08?
Pick C43400-H04 when the part is bent, formed or impact-loaded. Pick C43400-H08 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C43400-H04 and C43400-H08 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.