Copper Alloy C85700-M04 vs C85700-M05
Copper Alloy · C85700 temper comparison
C85700-M04 and C85700-M05 are two conditions of the same copper alloy grade, C85700: M04 (as pressure die cast) versus M05 (as plaster cast). The chemistry is identical, so every difference below comes from the condition. C85700-M05 is the stronger of the two: yield strength 170 MPa (24.7 ksi) against 145 MPa (21 ksi) for C85700-M04, about 17% more; tensile strength follows at 415 MPa (60.2 ksi) vs 380 MPa (55.1 ksi). C85700-M05 is harder — 85 HB against 78 HB for C85700-M04 — which matters for wear surfaces and threads.
C85700-M05Choose it when strength drives the design, or when surface hardness matters.
C85700-M04 vs C85700-M05: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 100 GPa14.5 Msi · Shear Modulus 37 GPa5.4 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.41 g/cm³0.3 lb/in³ · Melting Point (Solidus) 875°C1,607 °F · Liquidus Temperature 905°C1,661 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 84 W/m·K48.5 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 21.6 µm/m·K12 µin/in·°F · Latent Heat of Fusion 165 J/g70.9 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 22 % IACS · Electrical Resistivity 7.8×10⁻⁸ Ω·m3.07 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V · Corrosion Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Same in both: Machinability 80 / 100 · Weldability 20 / 100 · Castability 80 / 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) 4 kg CO₂/kg · Embodied Water 320 L/kg38.3 gal/lb · Typical Recycled Content 90%
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.
C85700-M04 vs C85700-M05 — frequently asked
Is C85700-M05 stronger than C85700-M04?
Yes. C85700-M05 has a typical yield strength of 170 MPa (24.7 ksi) against 145 MPa (21 ksi) for C85700-M04 — about 17% more. Tensile strength is 415 MPa (60.2 ksi) vs 380 MPa (55.1 ksi).
Which condition does FabDigit quote by default, M04 or M05?
M01 is the default C85700 condition in the FabDigit quote flow (neither M04 nor M05). 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 C85700-M04 over C85700-M05?
Pick C85700-M05 when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C85700-M04 and C85700-M05 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.