MECHANIC Solder Wire 0.4mm Sn63-Pb37

The MECHANIC 0.4mm solder wire is a balanced choice between precision and working speed, suited for soldering SMD and mid-sized components, as well as mobile phone and computer motherboard repair work that needs good control without the extra-thin gauge slowing you down.

Its formula is Sn63/Pb37 alloy (63% tin, 37% lead), a eutectic alloy that transitions directly from liquid to solid with no in-between mushy phase, giving clean, stable joints on the first pass. It contains a built-in CJ flux at a precise 0.05% ratio, with a 75% expansion rate that helps the flux activate properly during heating for strong adhesion at the joint. Total flux content ranges between 1.0% and 3.0%, balancing cleaning power with adhesion without leaving excess residue.

Suited for technicians who need a versatile wire — capable of handling both delicate components and general repair work that doesn't require the finer 0.3mm gauge.

Technical Specifications:

• Diameter: 0.4mm
• Alloy: Sn63/Pb37 (63% Tin / 37% Lead)
• Flux Ratio (CJ): 0.05%
• Expansion Rate: 75%
• Total Flux Content: 1.0% - 3.0%
• Weight: 40g