Solder & Low-Melting Alloy SAC305 vs Sn60Pb40Sb
Solder & Low-Melting Alloy · grade comparison
Solder & Low-Melting Alloy SAC305 and Sn60Pb40Sb are both solder & low-melting alloy grades. Sn60Pb40Sb is the stronger of the two: tensile strength 52 MPa (7.54 ksi) against 48 MPa (6.96 ksi) for SAC305, about 8% more. Sn60Pb40Sb is harder — 16 HV against 14 HV for SAC305 — which matters for wear surfaces and threads. SAC305 is lighter (7.38 g/cm³ vs 8.5 g/cm³ for Sn60Pb40Sb) and SAC305 is stiffer (45 GPa vs 31 GPa). On the shop floor, Sn60Pb40Sb machines more easily (fair vs poor) and SAC305 welds better (poor vs not recommended).
SAC305Choose it when weight is the constraint, or when the part sees heat.
Sn60Pb40SbChoose it when strength drives the design, or when surface hardness matters.
SAC305 vs Sn60Pb40Sb: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all solder & low-melting 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 solder & low-melting 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
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Shear Strength
Hardness, Vickers
Charpy V-Notch Impact (RT)
Same in both: Yield Strength (0.2% offset) 32 MPa4.6 ksi · Elongation at Break 35% · Fatigue Strength (Endurance Limit) 15 MPa2.2 ksi · Hardness, Brinell 15 HB
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
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Min Service Temperature -55°C-67 °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) -0.5 V · Corrosion Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Brazeability / Solderability
Same in both: Castability 95 / 100 · Polishability 25 / 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
Same in both: Thermal Shock Resistance Index 3
Strength versus weight
Yield strength against density for every solder & low-melting alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | SAC305 | Sn60Pb40Sb |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
SAC305 vs Sn60Pb40Sb — frequently asked
Is Sn60Pb40Sb stronger than SAC305?
Yes. Sn60Pb40Sb has a typical tensile strength of 52 MPa (7.54 ksi) against 48 MPa (6.96 ksi) for SAC305 — about 8% more.
Which is cheaper, SAC305 or Sn60Pb40Sb?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, SAC305 or Sn60Pb40Sb?
Sn60Pb40Sb. Its machinability rates fair (35/100) against poor (20/100) for SAC305; for welding the order is SAC305 first (poor, 30/100) then Sn60Pb40Sb (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in SAC305 and Sn60Pb40Sb 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.