Copper Alloy M1-H04 vs M1-H08
Copper Alloy · M1 temper comparison
M1-H04 and M1-H08 are two conditions of the same copper alloy grade, M1: H04 (full hard) versus H08 (spring hard). The chemistry is identical, so every difference below comes from the condition. M1-H08 is the stronger of the two: yield strength 350 MPa (50.8 ksi) against 310 MPa (45 ksi) for M1-H04, about 13% more; tensile strength follows at 380 MPa (55.1 ksi) vs 345 MPa (50 ksi). In exchange, M1-H04 is the more ductile: elongation 6% versus 4% for M1-H08, and M1-H08 is harder (115 HB vs 100 HB). M1-H04 is stiffer (128 GPa vs 117 GPa) and M1-H04 runs hotter in service (120°C vs 105°C continuous).
M1-H04Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
M1-H08Choose it when strength drives the design.
M1-H04 vs M1-H08: 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
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Same in both: 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 µm/m·K9.4 µin/in·°F · Latent Heat of Fusion 205 J/g88.1 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 97 % IACS · Electrical Resistivity 1.78×10⁻⁸ Ω·m0.701 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V · Corrosion Resistance 65 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 35 / 100 · Brazeability / Solderability 92 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 250 L/kg30 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.
M1-H04 vs M1-H08 — frequently asked
Is M1-H08 stronger than M1-H04?
Yes. M1-H08 has a typical yield strength of 350 MPa (50.8 ksi) against 310 MPa (45 ksi) for M1-H04 — about 13% more. Tensile strength is 380 MPa (55.1 ksi) vs 345 MPa (50 ksi).
Which condition does FabDigit quote by default, H04 or H08?
O60 is the default M1 condition in the FabDigit quote flow (neither H04 nor H08). 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 welds better, M1-H04 or M1-H08?
M1-H04. Its weldability rates fair (40/100) against fair (35/100) for M1-H08.
Ready to make it?
Upload a CAD file and FabDigit prices the part in M1-H04 and M1-H08 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.