Copper Alloy C68700-M30 vs C68700-O61
Copper Alloy · C68700 temper comparison
C68700-M30 and C68700-O61 are two conditions of the same copper alloy grade, C68700: M30 (as hot extruded) versus O61 (annealed). The chemistry is identical, so every difference below comes from the condition. C68700-O61 is the stronger of the two: yield strength 186 MPa (27 ksi) against 170 MPa (24.7 ksi) for C68700-M30, about 9% more. On the shop floor, C68700-O61 forms better (excellent vs very good).
C68700-O61Choose it when strength drives the design.
C68700-M30 vs C68700-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)
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 103 GPa14.9 Msi · Shear Modulus 39 GPa5.7 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.33 · Hardness, Brinell 85 HB · Hardness, Vickers 90 HV
Physical
Density and transition temperatures.
Same in both: Density 8.33 g/cm³0.3 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.
Same in both: Thermal Conductivity 100 W/m·K57.8 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 18 µm/m·K10 µin/in·°F · Latent Heat of Fusion 200 J/g86 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 23 % IACS · Electrical Resistivity 7.5×10⁻⁸ Ω·m2.95 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Formability (cold)
Same in both: Machinability 30 / 100 · Machinability Rating (AISI 1212 = 100 %) 60% · Weldability 35 / 100 · Brazeability / Solderability 85 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 52 MJ/kg22,356 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 30%
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.
C68700-M30 vs C68700-O61 — frequently asked
Is C68700-O61 stronger than C68700-M30?
Yes. C68700-O61 has a typical yield strength of 186 MPa (27 ksi) against 170 MPa (24.7 ksi) for C68700-M30 — about 9% more. Tensile strength is 415 MPa (60.2 ksi) vs 400 MPa (58 ksi).
Which condition does FabDigit quote by default, M30 or O61?
O61 is the default C68700 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 C68700-M30 over C68700-O61?
Pick C68700-O61 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C68700-M30 and C68700-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.