Kester part number 24-6337-0010 delivers professional grade Sn63Pb37 solder wire in a 0.020 inch diameter with 3.3 percent 44 Rosin Activated flux core, engineered for precision PCB assembly, electronics rework, and through hole soldering applications where fine wire control and reliable joints matter. The eutectic tin lead alloy melts at 183 degrees Celsius, making it ideal for legacy electronics repair and detailed component work that demands consistent, clean connections. This 1 pound spool is manufactured in the USA and provides the thermal performance and flux chemistry that professional technicians trust across lab, production, and field repair environments. The rosin activated flux delivers strong wetting and penetration on copper and component leads, though post solder cleaning is required to remove residue and ensure long term reliability.
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% 44 Rosin Activated Flux.
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. Rosin Activated 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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