Copper Alloy C65100-H04 vs C65100-O61
Copper Alloy · C65100 temper comparison
C65100-H04 and C65100-O61 are two conditions of the same copper alloy grade, C65100: H04 (full hard) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C65100-H04 is the stronger of the two: yield strength 380 MPa (55.1 ksi) against 120 MPa (17.4 ksi) for C65100-O61, about 3.2 times as much; tensile strength follows at 455 MPa (66 ksi) vs 290 MPa (42.1 ksi). In exchange, C65100-O61 is the more ductile: elongation 50% versus 13% for C65100-H04, and C65100-H04 is harder (150 HB vs 65 HB). C65100-O61 runs hotter in service (250°C vs 180°C continuous).
C65100-H04Choose it when strength drives the design.
C65100-O61Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C65100-H04 vs C65100-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
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 117 GPa17 Msi · Shear Modulus 44 GPa6.4 Msi · Bulk Modulus 122 GPa17.7 Msi · Poisson's Ratio 0.34 · Hardness, Vickers 158 HV
Physical
Density and transition temperatures.
Same in both: Density 8.75 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,030°C1,886 °F · Liquidus Temperature 1,060°C1,940 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 57 W/m·K32.9 BTU/hr·ft·°F · Specific Heat Capacity 380 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.9 µm/m·K9.9 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 12 % IACS · Electrical Resistivity 1.44×10⁻⁷ Ω·m5.67 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.27 V · Corrosion Resistance 70 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 90 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 58 MJ/kg24,936 BTU/lb · Embodied Carbon (primary production) 3.9 kg CO₂/kg · Embodied Water 300 L/kg35.9 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.
C65100-H04 vs C65100-O61 — frequently asked
Is C65100-H04 stronger than C65100-O61?
Yes. C65100-H04 has a typical yield strength of 380 MPa (55.1 ksi) against 120 MPa (17.4 ksi) for C65100-O61 — about 3.2 times as much. Tensile strength is 455 MPa (66 ksi) vs 290 MPa (42.1 ksi).
Which condition does FabDigit quote by default, H04 or O61?
H04 is the default C65100 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.
Which is easier to machine, C65100-H04 or C65100-O61?
C65100-H04, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for C65100-O61.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C65100-H04 and C65100-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.