Kester part number 24-6337-0039 is a professional grade solder wire featuring Sn63Pb37 alloy composition and a 0.040 inch diameter, making it ideal for medium scale PCB assembly, electronics rework, through hole soldering, and component repair work. The wire carries a 3.3 percent 44 Rosin Activated flux core that provides reliable wetting and joint quality across a wide range of hand soldering and small scale production applications. With a eutectic melting point of 183 degrees Celsius, this solder offers fast thermal cycling and clean, consistent results on both leaded and lead free compatible designs. Manufactured in the USA by Kester, this 1 pound spool delivers the precision and consistency that professional technicians and repair shops depend on for quality electronics work.
Key Features:
Alloy Composition: Sn63Pb37 (63% Tin, 37% Lead)
Diameter: .040" (1.0 mm)
Weight: 1 lb (approximately 454 grams)
Package Type: Spool (SPL)
Flux Core: 3.3% 44 Rosin Activated Flux
Melting Point: 183° C 361° F
Eutectic solder melts and solidifies at the same temperature.
.040" Diameter suitable for medium sized soldering jobs. Rosin Flux must be cleaned 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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