Copper Alloy C49300-H04 vs C49300-O61
Copper Alloy · C49300 temper comparison
C49300-H04 and C49300-O61 are two conditions of the same copper alloy grade, C49300: H04 (full hard) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C49300-H04 is the stronger of the two: yield strength 420 MPa (60.9 ksi) against 120 MPa (17.4 ksi) for C49300-O61, about 3.5 times as much; tensile strength follows at 520 MPa (75.4 ksi) vs 340 MPa (49.3 ksi). In exchange, C49300-O61 is the more ductile: elongation 45% versus 8% for C49300-H04, and C49300-H04 is harder (155 HB vs 65 HB). C49300-O61 runs hotter in service (200°C vs 150°C continuous). On the shop floor, C49300-H04 machines more easily (excellent vs very good).
C49300-H04Choose it when strength drives the design, or when the part is machined in volume.
C49300-O61Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C49300-H04 vs C49300-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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 103 GPa14.9 Msi · Shear Modulus 38 GPa5.5 Msi · Bulk Modulus 112 GPa16.2 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.5 g/cm³0.31 lb/in³ · Melting Point (Solidus) 885°C1,625 °F · Liquidus Temperature 920°C1,688 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 110 W/m·K63.6 BTU/hr·ft·°F · Specific Heat Capacity 380 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 20.5 µm/m·K11.4 µin/in·°F · Latent Heat of Fusion 175 J/g75.2 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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.28 V
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 %) 250% · Weldability 30 / 100 · Castability 55 / 100 · Brazeability / Solderability 88 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 45 MJ/kg19,347 BTU/lb · Embodied Carbon (primary production) 3.1 kg CO₂/kg · Embodied Water 250 L/kg30 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.
C49300-H04 vs C49300-O61 — frequently asked
Is C49300-H04 stronger than C49300-O61?
Yes. C49300-H04 has a typical yield strength of 420 MPa (60.9 ksi) against 120 MPa (17.4 ksi) for C49300-O61 — about 3.5 times as much. Tensile strength is 520 MPa (75.4 ksi) vs 340 MPa (49.3 ksi).
Which condition does FabDigit quote by default, H04 or O61?
H02 is the default C49300 condition in the FabDigit quote flow (neither H04 nor O61). 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, C49300-H04 or C49300-O61?
C49300-H04. Its machinability rates excellent (90/100) against very good (80/100) for C49300-O61.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C49300-H04 and C49300-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.