Copper Alloy C70260-TM02 vs C70260-TM04
Copper Alloy · C70260 temper comparison
C70260-TM02 and C70260-TM04 are two conditions of the same copper alloy grade, C70260: TM02 (mill hardened, half hard) versus TM04 (mill hardened, full hard). The chemistry is identical, so every difference below comes from the condition. C70260-TM04 is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 535 MPa (77.6 ksi) for C70260-TM02, about 16% more; tensile strength follows at 665 MPa (96.5 ksi) vs 595 MPa (86.3 ksi). In exchange, C70260-TM02 is the more ductile: elongation 9% versus 5% for C70260-TM04, and C70260-TM04 is harder (215 HV vs 185 HV).
C70260-TM02Choose it when the part is bent, formed or impact-loaded.
C70260-TM04Choose it when strength drives the design.
C70260-TM02 vs C70260-TM04: 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
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 130 GPa18.9 Msi · Shear Modulus 49 GPa7.1 Msi · Bulk Modulus 130 GPa18.9 Msi · Poisson's Ratio 0.33 · Hardness, Brinell 175 HB
Physical
Density and transition temperatures.
Same in both: Density 8.83 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,085°C1,985 °F · Liquidus Temperature 1,100°C2,012 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 377 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 · Max Service Temperature (continuous) 200°C392 °F · 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) -0.24 V · Corrosion Resistance 62 / 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 %) 30% · Weldability 45 / 100 · Brazeability / Solderability 80 / 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 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.
C70260-TM02 vs C70260-TM04 — frequently asked
Is C70260-TM04 stronger than C70260-TM02?
Yes. C70260-TM04 has a typical yield strength of 620 MPa (89.9 ksi) against 535 MPa (77.6 ksi) for C70260-TM02 — about 16% more. Tensile strength is 665 MPa (96.5 ksi) vs 595 MPa (86.3 ksi).
Which condition does FabDigit quote by default, TM02 or TM04?
TM02 is the default C70260 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 C70260-TM02 over C70260-TM04?
Pick C70260-TM02 when the part is bent, formed or impact-loaded. Pick C70260-TM04 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C70260-TM02 and C70260-TM04 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.