Kester part number 24-6040-9710 is a professional grade solder wire featuring a Sn60Pb40 alloy composition (60% tin, 40% lead) with a 0.031 inch diameter and 3.3% rosin mildly activated flux core, making it ideal for PCB assembly, electronics rework, through hole soldering, and precision repair work. The 183 to 190 degree Celsius melting point and consistent flux formulation deliver reliable wetting and joint quality across a wide range of hand soldering and production applications. This American made wire is a trusted choice for technicians and repair professionals who demand predictable performance and clean joints without compromise. The rosin flux residue is easily cleaned with standard flux cleaner, leaving your boards ready for inspection and testing.
Key Features:
Alloy Composition: Sn60Pb40 (60% Tin, 40% Lead)
Diameter: .031" (0.8 mm)
Weight: 1 lb (approximately 454 grams)
Package Type: Spool (SPL)
Flux Core: 3.3% 285 Rosin Mildly Activated Flux
Melting Point:183-190° C 361-374° F
.031" 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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