Copper Alloy C1220 1/4H vs C1220-O
Copper Alloy · C1220 temper comparison
C1220 1/4H and C1220-O are two conditions of the same copper alloy grade, C1220: 1/4H (quarter hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. C1220 1/4H is the stronger of the two: yield strength 190 MPa (27.6 ksi) against 70 MPa (10.2 ksi) for C1220-O, about 171% more; tensile strength follows at 270 MPa (39.2 ksi) vs 225 MPa (32.6 ksi). In exchange, C1220-O is the more ductile: elongation 45% versus 25% for C1220 1/4H, and C1220 1/4H is harder (72 HB vs 45 HB). C1220-O runs hotter in service (200°C vs 150°C continuous).
C1220 1/4HChoose it when strength drives the design.
C1220-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C1220 1/4H vs C1220-O: 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, Vickers
Same in both: Elastic (Young's) Modulus 117 GPa17 Msi · Shear Modulus 44 GPa6.4 Msi · Bulk Modulus 140 GPa20.3 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,065°C1,949 °F · Liquidus Temperature 1,083°C1,981 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 385 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.6 µm/m·K9.8 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.22 V · Corrosion Resistance 68 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 20% · Weldability 80 / 100 · Castability 40 / 100 · Brazeability / Solderability 100 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 57 MJ/kg24,506 BTU/lb · Embodied Carbon (primary production) 3.8 kg CO₂/kg · Embodied Water 300 L/kg35.9 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.
C1220 1/4H vs C1220-O — frequently asked
Is C1220 1/4H stronger than C1220-O?
Yes. C1220 1/4H has a typical yield strength of 190 MPa (27.6 ksi) against 70 MPa (10.2 ksi) for C1220-O — about 171% more. Tensile strength is 270 MPa (39.2 ksi) vs 225 MPa (32.6 ksi).
Which condition does FabDigit quote by default, 1/4H or O?
O is the default C1220 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.
Which is easier to machine, C1220 1/4H or C1220-O?
C1220 1/4H, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for C1220-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C1220 1/4H and C1220-O 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.