Copper Alloy C81200-M02 vs C81200-O61
Copper Alloy · C81200 temper comparison
C81200-M02 and C81200-O61 are two conditions of the same copper alloy grade, C81200: M02 (as centrifugally cast) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C81200-M02 is the stronger of the two: yield strength 65 MPa (9.43 ksi) against 55 MPa (7.98 ksi) for C81200-O61, about 18% more; tensile strength follows at 185 MPa (26.8 ksi) vs 165 MPa (23.9 ksi). In exchange, C81200-O61 is the more ductile: elongation 45% versus 40% for C81200-M02, and C81200-M02 is harder (46 HB vs 40 HB).
C81200-M02Choose it when strength drives the design.
C81200-O61Choose it when the part is bent, formed or impact-loaded.
C81200-M02 vs C81200-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, Vickers
Same in both: Elastic (Young's) Modulus 112 GPa16.2 Msi · Shear Modulus 42 GPa6.1 Msi · Bulk Modulus 138 GPa20 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.91 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,065°C1,949 °F · Liquidus Temperature 1,083°C1,981 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 385 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.6 µm/m·K9.8 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 V · Corrosion Resistance 65 / 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 60 / 100 · Brazeability / Solderability 90 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 50%
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.
C81200-M02 vs C81200-O61 — frequently asked
Is C81200-M02 stronger than C81200-O61?
Yes. C81200-M02 has a typical yield strength of 65 MPa (9.43 ksi) against 55 MPa (7.98 ksi) for C81200-O61 — about 18% more. Tensile strength is 185 MPa (26.8 ksi) vs 165 MPa (23.9 ksi).
Which condition does FabDigit quote by default, M02 or O61?
M01 is the default C81200 condition in the FabDigit quote flow (neither M02 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.
When should I choose C81200-M02 over C81200-O61?
Pick C81200-M02 when strength drives the design. Pick C81200-O61 when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C81200-M02 and C81200-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.