Copper Alloy C66900-H04 vs C66900-O60
Copper Alloy · C66900 temper comparison
C66900-H04 and C66900-O60 are two conditions of the same copper alloy grade, C66900: H04 (full hard) versus O60 (soft annealed). The chemistry is identical, so every difference below comes from the condition. C66900-H04 is the stronger of the two: yield strength 565 MPa (81.9 ksi) against 205 MPa (29.7 ksi) for C66900-O60, about 176% more; tensile strength follows at 700 MPa (102 ksi) vs 480 MPa (69.6 ksi). In exchange, C66900-O60 is the more ductile: elongation 45% versus 7% for C66900-H04, and C66900-H04 is harder (195 HV vs 110 HV). C66900-O60 runs hotter in service (200°C vs 150°C continuous).
C66900-H04Choose it when strength drives the design.
C66900-O60Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C66900-H04 vs C66900-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, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 105 GPa15.2 Msi · Shear Modulus 39 GPa5.7 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.33 · Hardness, Brinell 185 HB
Physical
Density and transition temperatures.
Same in both: Density 8.1 g/cm³0.29 lb/in³ · Melting Point (Solidus) 880°C1,616 °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 27 W/m·K15.6 BTU/hr·ft·°F · Specific Heat Capacity 380 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 20 µm/m·K11.1 µin/in·°F · Latent Heat of Fusion 175 J/g75.2 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 4.5 % IACS · Electrical Resistivity 3.8×10⁻⁷ Ω·m15 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 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 30 / 100 · Weldability 40 / 100 · Castability 40 / 100 · Brazeability / Solderability 60 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.5 kg CO₂/kg · Embodied Water 400 L/kg47.9 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.
C66900-H04 vs C66900-O60 — frequently asked
Is C66900-H04 stronger than C66900-O60?
Yes. C66900-H04 has a typical yield strength of 565 MPa (81.9 ksi) against 205 MPa (29.7 ksi) for C66900-O60 — about 176% more. Tensile strength is 700 MPa (102 ksi) vs 480 MPa (69.6 ksi).
Which condition does FabDigit quote by default, H04 or O60?
H04 is the default C66900 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 C66900-H04 over C66900-O60?
Pick C66900-H04 when strength drives the design. Pick C66900-O60 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 C66900-H04 and C66900-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.