Copper Alloy CC761S-GM vs CC761S-GS
Copper Alloy · CC761S temper comparison
CC761S-GM and CC761S-GS are two conditions of the same copper alloy grade, CC761S: GM (gravity die (permanent mould) cast) versus GS (sand cast). The chemistry is identical, so every difference below comes from the condition. CC761S-GM is the stronger of the two: yield strength 260 MPa (37.7 ksi) against 240 MPa (34.8 ksi) for CC761S-GS, about 8% more; tensile strength follows at 500 MPa (72.5 ksi) vs 440 MPa (63.8 ksi). CC761S-GM is harder — 115 HB against 105 HB for CC761S-GS — which matters for wear surfaces and threads.
CC761S-GMChoose it when strength drives the design, or when surface hardness matters.
CC761S-GM vs CC761S-GS: 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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 36 GPa5.2 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.34 · Elongation at Break 12%
Physical
Density and transition temperatures.
Same in both: Density 8.3 g/cm³0.3 lb/in³ · Melting Point (Solidus) 821°C1,510 °F · Liquidus Temperature 917°C1,683 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 28 W/m·K16.2 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 19.6 µm/m·K10.9 µin/in·°F · Latent Heat of Fusion 170 J/g73.1 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6.7 % IACS · Electrical Resistivity 2.6×10⁻⁷ Ω·m10.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.28 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Same in both: Machinability 55 / 100 · Machinability Rating (AISI 1212 = 100 %) 150% · Weldability 45 / 100 · Formability (cold) 15 / 100 · Castability 88 / 100 · Brazeability / Solderability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 45 MJ/kg19,347 BTU/lb · Embodied Carbon (primary production) 3.2 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 80%
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.
CC761S-GM vs CC761S-GS — frequently asked
Is CC761S-GM stronger than CC761S-GS?
Yes. CC761S-GM has a typical yield strength of 260 MPa (37.7 ksi) against 240 MPa (34.8 ksi) for CC761S-GS — about 8% more. Tensile strength is 500 MPa (72.5 ksi) vs 440 MPa (63.8 ksi).
Which condition does FabDigit quote by default, GM or GS?
GM is the default CC761S 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 CC761S-GM over CC761S-GS?
Pick CC761S-GM when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CC761S-GM and CC761S-GS 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.