Kester part number 24-6337-6401 is a professional grade solder wire featuring a eutectic Sn63Pb37 alloy composition with 3.3% 331 water soluble flux, available in a thin .020" diameter that makes it ideal for precision PCB assembly, through hole soldering, electronics rework, and fine pitch component repairs. The eutectic tin lead blend melts at 183°C (361°F), offering fast wetting and reliable joint formation across a broad range of soldering applications. This .020" diameter format is particularly suited to small and medium scale work where control and accuracy are essential, whether you're working on delicate circuit boards or detailed repair jobs. Kester's Made in USA manufacturing and 331 water soluble flux chemistry make this a dependable choice for professionals who demand consistent results and predictable performance.
Key Features:
Alloy Composition: Sn63Pb37 (63% Tin, 37% Lead)
Diameter: .020" (0.5 mm)
Weight: 1 lb (approximately 454 grams)
Package Type: Spool (SPL)
Flux Core: 3.3% 331 Water Soluble
Melting Point: 183° C 361° F
Eutectic solder melts and solidifies at the same temperature.
.020" Diameter suitable for small to 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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