Copper Alloy Cu-OF1-H04 vs Cu-OF1-M
Copper Alloy · Cu-OF1 temper comparison
Cu-OF1-H04 and Cu-OF1-M are two conditions of the same copper alloy grade, Cu-OF1: H04 (full hard) versus M (thermomechanically controlled processed). The chemistry is identical, so every difference below comes from the condition. Cu-OF1-H04 is the stronger of the two: yield strength 300 MPa (43.5 ksi) against 55 MPa (7.98 ksi) for Cu-OF1-M, about 5.5 times as much; tensile strength follows at 350 MPa (50.8 ksi) vs 170 MPa (24.7 ksi). In exchange, Cu-OF1-M is the more ductile: elongation 35% versus 12% for Cu-OF1-H04, and Cu-OF1-H04 is harder (95 HB vs 40 HB). Cu-OF1-H04 is stiffer (125 GPa vs 115 GPa) and Cu-OF1-M runs hotter in service (250°C vs 150°C continuous).
Cu-OF1-H04Choose it when strength drives the design.
Cu-OF1-MChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Cu-OF1-H04 vs Cu-OF1-M: 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)
Elongation at Break
Hardness, Brinell
Hardness, Vickers
Same in both: Shear Modulus 46 GPa6.7 Msi · Bulk Modulus 140 GPa20.3 Msi · Poisson's Ratio 0.34 · Reduction in Area 60% · Shear Strength 200 MPa29 ksi · Fatigue Strength (Endurance Limit) 110 MPa16 ksi · Hardness, Rockwell B 45 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.94 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,083°C1,981 °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 µm/m·K9.4 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Min Service Temperature -269°C-452 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 1.72×10⁻⁸ Ω·m0.678 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.28 V · Corrosion Resistance 62 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Machinability 27 / 100 · Weldability 68 / 100 · Castability 55 / 100 · Brazeability / Solderability 95 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 58 MJ/kg24,936 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 10%
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.
Cu-OF1-H04 vs Cu-OF1-M — frequently asked
Is Cu-OF1-H04 stronger than Cu-OF1-M?
Yes. Cu-OF1-H04 has a typical yield strength of 300 MPa (43.5 ksi) against 55 MPa (7.98 ksi) for Cu-OF1-M — about 5.5 times as much. Tensile strength is 350 MPa (50.8 ksi) vs 170 MPa (24.7 ksi).
Which condition does FabDigit quote by default, H04 or M?
H04 is the default Cu-OF1 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 Cu-OF1-H04 over Cu-OF1-M?
Pick Cu-OF1-H04 when strength drives the design. Pick Cu-OF1-M when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Cu-OF1-H04 and Cu-OF1-M 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.