Solder & Low-Melting Alloy Sn60Pb40Sb vs Sn63Pb37Sb
Solder & Low-Melting Alloy · grade comparison
Solder & Low-Melting Alloy Sn60Pb40Sb and Sn63Pb37Sb are both solder & low-melting alloy grades. Sn63Pb37Sb is the stronger of the two: yield strength 38 MPa (5.51 ksi) against 32 MPa (4.64 ksi) for Sn60Pb40Sb, about 19% more; tensile strength follows at 58 MPa (8.41 ksi) vs 52 MPa (7.54 ksi). Sn63Pb37Sb is harder — 16 HB against 15 HB for Sn60Pb40Sb — which matters for wear surfaces and threads. Sn60Pb40Sb runs hotter in service (110°C vs 100°C continuous). On the shop floor, Sn60Pb40Sb machines more easily (fair vs poor) and Sn63Pb37Sb welds better (poor vs not recommended).
Sn60Pb40SbChoose it when the part sees heat, or when the part is machined in volume.
Sn63Pb37SbChoose it when strength drives the design, or when surface hardness matters.
Sn60Pb40Sb vs Sn63Pb37Sb: 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)
Yield Strength (0.2% offset)
Elongation at Break
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Shear Strength 38 MPa5.5 ksi · Fatigue Strength (Endurance Limit) 15 MPa2.2 ksi
Physical
Density and transition temperatures.
Density
Liquidus Temperature
Same in both: Melting Point (Solidus) 183°C361 °F
Thermal
How each material carries heat and how hot it can run.
Specific Heat Capacity
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 50 W/m·K28.9 BTU/hr·ft·°F · Thermal Expansion (CTE, 20–100 °C) 24.5 µm/m·K13.6 µin/in·°F · Min Service Temperature -55°C-67 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 11.5 % IACS · Electrical Resistivity 1.5×10⁻⁷ Ω·m5.91 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.5 V
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)
Typical Recycled Content
Same in both: Embodied Water 320 L/kg38.3 gal/lb
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 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 | Sn60Pb40Sb | Sn63Pb37Sb |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Sn60Pb40Sb vs Sn63Pb37Sb — frequently asked
Is Sn63Pb37Sb stronger than Sn60Pb40Sb?
Yes. Sn63Pb37Sb has a typical yield strength of 38 MPa (5.51 ksi) against 32 MPa (4.64 ksi) for Sn60Pb40Sb — about 19% more. Tensile strength is 58 MPa (8.41 ksi) vs 52 MPa (7.54 ksi).
Which is cheaper, Sn60Pb40Sb or Sn63Pb37Sb?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Sn60Pb40Sb or Sn63Pb37Sb?
Sn60Pb40Sb. Its machinability rates fair (35/100) against poor (20/100) for Sn63Pb37Sb; for welding the order is Sn63Pb37Sb first (poor, 20/100) then Sn60Pb40Sb (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Sn60Pb40Sb and Sn63Pb37Sb 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.