CYNEL Tin Spool 3.0mm 250g Sn60Pb40 Leaded Solder Wire with Rosin Core

On a busy electronics workbench, a technician reaches for a reliable solder wire to repair a vintage amplifier or assemble a prototype board. The CYNEL Tin Spool 3.0mm 250g Sn60Pb40 delivers consistent, strong joints for general electronics, electrical repairs, and prototyping. Its thick 3.0 mm diameter suits larger connections and quick heat transfer, while the rosin core flux ensures clean, oxide-free bonds.

Key specifications

• Alloy composition: 60% tin (Sn), 40% lead (Pb) – Sn60Pb40
• Wire diameter: 3.0 mm
• Spool net weight: 250 g
• Flux type: Rosin core, 2.5% content
• Melting point: 183–190 °C (eutectic at 183 °C)
• Leaded solder, not RoHS compliant
• Packaged on a plastic spool

Why choose it

Sn60Pb40 is a classic eutectic alloy that melts and solidifies at a single temperature, reducing the risk of cold joints and ensuring smooth, shiny fillets. The generous 250 g spool offers long-lasting supply for frequent soldering tasks. The 3.0 mm diameter is ideal for high-power connections, tinning large wires, and applications where rapid heat delivery is needed.

Ideal use cases

• Repairing through-hole components on PCBs
• Soldering connectors and terminals in automotive or industrial settings
• Prototyping and hobbyist electronics projects
• General electrical wiring and cable splicing

Good to know

This solder contains lead; use proper ventilation and wash hands after handling. The rosin core flux is mildly activated and leaves a non-corrosive residue that can be cleaned with isopropyl alcohol if desired. Store in a dry place to maintain flux activity.