Copper Alloy C66100-H04 vs C66100-O60
Copper Alloy · C66100 temper comparison
C66100-H04 and C66100-O60 are two conditions of the same copper alloy grade, C66100: H04 (full hard) versus O60 (soft annealed). The chemistry is identical, so every difference below comes from the condition. C66100-H04 is the stronger of the two: yield strength 380 MPa (55.1 ksi) against 125 MPa (18.1 ksi) for C66100-O60, about 3.0 times as much; tensile strength follows at 515 MPa (74.7 ksi) vs 310 MPa (45 ksi). In exchange, C66100-O60 is the more ductile: elongation 45% versus 12% for C66100-H04, and C66100-H04 is harder (150 HB vs 65 HB). C66100-O60 runs hotter in service (300°C vs 200°C continuous). On the shop floor, C66100-H04 machines more easily (good vs fair).
C66100-H04Choose it when strength drives the design, or when the part is machined in volume.
C66100-O60Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C66100-H04 vs C66100-O60: 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
Same in both: Elastic (Young's) Modulus 117 GPa17 Msi · Shear Modulus 44 GPa6.4 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.53 g/cm³0.31 lb/in³ · Melting Point (Solidus) 971°C1,780 °F · Liquidus Temperature 1,027°C1,881 °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 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 18.4 µm/m·K10.2 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) -0.26 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: Castability 35 / 100 · Brazeability / Solderability 75 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 320 L/kg38.3 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.
C66100-H04 vs C66100-O60 — frequently asked
Is C66100-H04 stronger than C66100-O60?
Yes. C66100-H04 has a typical yield strength of 380 MPa (55.1 ksi) against 125 MPa (18.1 ksi) for C66100-O60 — about 3.0 times as much. Tensile strength is 515 MPa (74.7 ksi) vs 310 MPa (45 ksi).
Which condition does FabDigit quote by default, H04 or O60?
H04 is the default C66100 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, C66100-H04 or C66100-O60?
C66100-H04. Its machinability rates good (55/100) against fair (45/100) for C66100-O60; for welding the order is C66100-O60 first (fair, 35/100) then C66100-H04 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C66100-H04 and C66100-O60 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.