Copper Alloy C74500-H02 vs C74500-O61
Copper Alloy · C74500 temper comparison
C74500-H02 and C74500-O61 are two conditions of the same copper alloy grade, C74500: H02 (half hard) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C74500-H02 is the stronger of the two: yield strength 400 MPa (58 ksi) against 155 MPa (22.5 ksi) for C74500-O61, about 158% more; tensile strength follows at 510 MPa (74 ksi) vs 385 MPa (55.8 ksi). In exchange, C74500-O61 is the more ductile: elongation 40% versus 12% for C74500-H02, and C74500-H02 is harder (150 HB vs 95 HB). C74500-O61 runs hotter in service (230°C vs 180°C continuous).
C74500-H02Choose it when strength drives the design.
C74500-O61Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C74500-H02 vs C74500-O61: 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, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 127 GPa18.4 Msi · Shear Modulus 48 GPa7 Msi · Bulk Modulus 128 GPa18.6 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 8.73 g/cm³0.32 lb/in³ · Melting Point (Solidus) 954°C1,749 °F · Liquidus Temperature 1,021°C1,870 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 45 W/m·K26 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.2 µm/m·K9 µin/in·°F · Latent Heat of Fusion 195 J/g83.8 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 9 % IACS · Electrical Resistivity 1.92×10⁻⁷ Ω·m7.56 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.26 V · Corrosion Resistance 62 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 20% · Weldability 40 / 100 · Brazeability / Solderability 88 / 100 · Polishability 90 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 78 MJ/kg33,534 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 40%
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.
C74500-H02 vs C74500-O61 — frequently asked
Is C74500-H02 stronger than C74500-O61?
Yes. C74500-H02 has a typical yield strength of 400 MPa (58 ksi) against 155 MPa (22.5 ksi) for C74500-O61 — about 158% more. Tensile strength is 510 MPa (74 ksi) vs 385 MPa (55.8 ksi).
Which condition does FabDigit quote by default, H02 or O61?
H02 is the default C74500 condition in the FabDigit quote flow. 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 C74500-H02 over C74500-O61?
Pick C74500-H02 when strength drives the design. Pick C74500-O61 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 C74500-H02 and C74500-O61 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.