Kester part number 24-6337-6403 is a professional grade solder wire featuring a eutectic Sn63Pb37 alloy composition, delivering reliable performance for PCB assembly, electronics rework, through hole soldering, and precision repair work. The 0.031 inch diameter with 3.3% water soluble flux core provides excellent wetting and consistent results across a wide range of hand soldering applications. This water soluble formulation requires thorough post solder cleaning but offers superior flux activity for challenging joints and component densities. Made in the USA, it's a trusted choice for technicians and hobbyists who demand eutectic melting characteristics and dependable joint quality.
Key Features:
Alloy Composition: Sn63Pb37 (63% Tin, 37% Lead)
Diameter: .031" (0.8 mm)
Weight: 1 lb (approximately 454 grams)
Package Type: Spool (SPL)
Flux Core: 3.3% 331 Water Soluble Flux
Melting Point: 183° C 361° F
Eutectic solder melts and solidifies at the same temperature.
.031" Diameter suitable for medium sized soldering jobs. Water Soluble flux must be cleaned thoroughly after use.
Ultra fine sized diameter useful for precision soldering and micro electronics.
.015" (0.4 mm)
Very fine sized diameter useful for precision soldering and jobs requiring small amounts of solder.
.020" (0.5 mm)
Fine sized diameter used for through hole and and surface mount work. Delivers a Controlled amount of solder.
.025" (0.6 mm)
Ideal for standard circuit board components where precision is needed but not ultra-fine work.
.031" (0.8 mm)
Ideal for fixing circuit boards, replacing components, and general rework. Popular for Arduino, Raspberry Pi, and DIY projects. It's a versatile diameter, often called the "sweet spot" for electronics.
.040" (1.0 mm)
Perfect for surface-mount devices (SMDs) and medium components where precision is key but more solder is needed.
.050" (1.27 mm)
Used for various tasks where a balance of flow and control is required, like general electrical repairs.
.062" (1.5 mm)
medium-thickness wire ideal for general electronics, larger through-hole components, appliance repair, automotive work, and crafts like stained glass
.093" (2.36 mm)
versatile, medium-to-thick wire used for general and heavier-duty electrical, electronics, automotive, and HVAC repairs/manufacturing.
Size guide text
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