Copper Alloy CC490K vs CC766S
Copper Alloy · grade comparison
Copper Alloy CC490K and CC766S are both copper alloy grades. CC766S is the stronger of the two: yield strength 155 MPa (22.5 ksi) against 100 MPa (14.5 ksi) for CC490K, about 55% more; tensile strength follows at 400 MPa (58 ksi) vs 215 MPa (31.2 ksi). CC766S is harder — 95 HB against 65 HB for CC490K — which matters for wear surfaces and threads. CC766S is lighter (8.35 g/cm³ vs 8.7 g/cm³ for CC490K) and CC766S is stiffer (95 GPa vs 90 GPa). On the shop floor, CC490K machines more easily (very good vs fair), CC766S welds better (fair vs poor), and CC766S forms better (poor vs not recommended).
CC490KChoose it when the part is machined in volume.
CC766SChoose it when strength drives the design, or when surface hardness matters.
CC490K vs CC766S: 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
Shear Modulus
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Fracture Toughness (K_IC)
Same in both: Poisson's Ratio 0.34 · Elongation at Break 20% · Reduction in Area 20% · Charpy V-Notch Impact (RT) 25 J18.4 ft·lbf
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Same in both: Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
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.
Manufacturing and finishing
| Capability | CC490K | CC766S |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
CC490K vs CC766S — frequently asked
Is CC766S stronger than CC490K?
Yes. CC766S has a typical yield strength of 155 MPa (22.5 ksi) against 100 MPa (14.5 ksi) for CC490K — about 55% more. Tensile strength is 400 MPa (58 ksi) vs 215 MPa (31.2 ksi).
Which is cheaper, CC490K or CC766S?
CC766S is the lower-cost material: it sits in the premium tier ($$$) while CC490K is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, CC490K or CC766S?
CC490K. Its machinability rates very good (80/100) against fair (45/100) for CC766S; for welding the order is CC766S first (fair, 35/100) then CC490K (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in CC490K and CC766S 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.