Magnesium Alloy M1A-H24 vs M1A-O
Magnesium Alloy · M1A temper comparison
M1A-H24 and M1A-O are two conditions of the same magnesium alloy grade, M1A: H24 (strain hardened and partially annealed, half hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. M1A-H24 is the stronger of the two: yield strength 180 MPa (26.1 ksi) against 115 MPa (16.7 ksi) for M1A-O, about 57% more; tensile strength follows at 255 MPa (37 ksi) vs 230 MPa (33.4 ksi). In exchange, M1A-O is the more ductile: elongation 12% versus 6% for M1A-H24, and M1A-H24 is harder (50 HB vs 44 HB). M1A-O runs hotter in service (150°C vs 120°C continuous).
M1A-H24Choose it when strength drives the design.
M1A-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
M1A-H24 vs M1A-O: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all magnesium 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 magnesium 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 45 GPa6.5 Msi · Shear Modulus 17 GPa2.5 Msi · Bulk Modulus 45 GPa6.5 Msi · Poisson's Ratio 0.35 · Fracture Toughness (K_IC) 15 MPa·√m13.7 ksi·√in · Charpy V-Notch Impact (RT) 5 J3.7 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 1.76 g/cm³0.06 lb/in³ · Melting Point (Solidus) 648°C1,198 °F · Liquidus Temperature 650°C1,202 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 138 W/m·K79.7 BTU/hr·ft·°F · Specific Heat Capacity 1,020 J/kg·K0.24 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 26 µm/m·K14.4 µin/in·°F · Latent Heat of Fusion 373 J/g160 BTU/lb · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 33 % IACS · Electrical Resistivity 5.2×10⁻⁸ Ω·m2.05 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -1.6 V · Corrosion Resistance 28 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Formability (cold)
Same in both: Machinability 96 / 100 · Machinability Rating (AISI 1212 = 100 %) 400% · Weldability 88 / 100 · Castability 30 / 100 · Brazeability / Solderability 25 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 350 MJ/kg150,473 BTU/lb · Embodied Carbon (primary production) 32 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 25%
Strength versus weight
Yield strength against density for every magnesium alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
M1A-H24 vs M1A-O — frequently asked
Is M1A-H24 stronger than M1A-O?
Yes. M1A-H24 has a typical yield strength of 180 MPa (26.1 ksi) against 115 MPa (16.7 ksi) for M1A-O — about 57% more. Tensile strength is 255 MPa (37 ksi) vs 230 MPa (33.4 ksi).
Which condition does FabDigit quote by default, H24 or O?
O is the default M1A 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 M1A-H24 over M1A-O?
Pick M1A-H24 when strength drives the design. Pick M1A-O 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 M1A-H24 and M1A-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.