Steel 1.2379 vs A11
Steel · grade comparison
Steel 1.2379 and A11 are both steel grades, both tool steel. A11 is the stronger of the two: yield strength 600 MPa (87 ksi) against 480 MPa (69.6 ksi) for 1.2379, about 25% more; tensile strength follows at 900 MPa (131 ksi) vs 800 MPa (116 ksi). In exchange, 1.2379 is the more ductile: elongation 12% versus 8% for A11, and A11 is harder (269 HB vs 235 HB). A11 is lighter (7.41 g/cm³ vs 7.7 g/cm³ for 1.2379) and A11 runs hotter in service (425°C vs 200°C continuous). On the shop floor, 1.2379 machines more easily (fair vs poor) and 1.2379 sits in a lower cost tier (premium, $$$) than A11 (specialty, $$$$$).
1.2379Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
A11Choose it when strength drives the design, or when weight is the constraint.
1.2379 vs A11: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all steel 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 steel 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
Shear Modulus
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Hardness, Brinell
Hardness, Vickers
Reduction in Area
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Rockwell B
Hardness, Rockwell C
Same in both: Poisson's Ratio 0.29 · Charpy V-Notch Impact (RT) 12 J8.9 ft·lbf
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.7 % IACS · Electrical Resistivity 6.5×10⁻⁷ Ω·m25.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Same in both: Weldability 15 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | 1.2379 | A11 |
|---|---|---|
| Default condition | Annealed | Annealed |
| Relative cost | $$$ Premium | $$$$$ Specialty |
| Min. machined wall | 0.8 mm | 0.8 mm |
| Best machined surface | Ra 1.6 µm | Ra 1.6 µm |
Both are offered for CNC machining. Both take the same 38 finishes: AlCrN, AlTiN, Black Oxide, CVD Al2O3, CVD TiCN, CVD TiN, Cerakote, Chrome Plating, Copper Plating, CrN, DLC, E-Coating and 26 more.
1.2379 vs A11 — frequently asked
Is A11 stronger than 1.2379?
Yes. A11 has a typical yield strength of 600 MPa (87 ksi) against 480 MPa (69.6 ksi) for 1.2379 — about 25% more. Tensile strength is 900 MPa (131 ksi) vs 800 MPa (116 ksi).
Which is cheaper, 1.2379 or A11?
1.2379 is the lower-cost material: it sits in the premium tier ($$$) while A11 is specialty ($$$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, 1.2379 or A11?
1.2379. Its machinability rates fair (35/100) against poor (20/100) for A11.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.2379 and A11 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.