Copper Alloy C61300-M20 vs C61300-O61
Copper Alloy · C61300 temper comparison
C61300-M20 and C61300-O61 are two conditions of the same copper alloy grade, C61300: M20 (as hot rolled) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C61300-M20 is the stronger of the two: yield strength 275 MPa (39.9 ksi) against 220 MPa (31.9 ksi) for C61300-O61, about 25% more. In exchange, C61300-O61 is the more ductile: elongation 42% versus 35% for C61300-M20, and C61300-M20 is harder (150 HB vs 135 HB).
C61300-M20Choose it when strength drives the design.
C61300-O61Choose it when the part is bent, formed or impact-loaded.
C61300-M20 vs C61300-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 112 GPa16.2 Msi · Poisson's Ratio 0.32
Physical
Density and transition temperatures.
Same in both: Density 7.89 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,038°C1,900 °F · Liquidus Temperature 1,046°C1,915 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 62 W/m·K35.8 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.2 µm/m·K9 µin/in·°F · Latent Heat of Fusion 210 J/g90.3 BTU/lb · Max Service Temperature (continuous) 300°C572 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 10.9 % IACS · Electrical Resistivity 1.58×10⁻⁷ Ω·m6.22 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.31 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 78 / 100 · Castability 55 / 100 · Brazeability / Solderability 32 / 100 · Polishability 72 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 58 MJ/kg24,936 BTU/lb · Embodied Carbon (primary production) 3.8 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 35%
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.
C61300-M20 vs C61300-O61 — frequently asked
Is C61300-M20 stronger than C61300-O61?
Yes. C61300-M20 has a typical yield strength of 275 MPa (39.9 ksi) against 220 MPa (31.9 ksi) for C61300-O61 — about 25% more. Tensile strength is 550 MPa (79.8 ksi) vs 530 MPa (76.9 ksi).
Which condition does FabDigit quote by default, M20 or O61?
M20 is the default C61300 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 C61300-M20 over C61300-O61?
Pick C61300-M20 when strength drives the design. Pick C61300-O61 when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C61300-M20 and C61300-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.