92-6337-6402 is a flux-cored solder wire featuring a Sn63Pb37 (63% tin, 37% lead) alloy composition with Kester's 331 water-soluble organic flux system. The wire has a diameter of 0.031 inches (0.80 mm) with a 66-core construction and 3.3% flux content by weight. This product is classified as water-soluble type and contains halogen, making it effective for soldering difficult metals with fast action and mild flux properties. The 331 organic flux is more heat-stable than traditional rosin fluxes, producing minimal smoke and odor, with residue that can be completely removed by simple heated water rinse using deionized water. This solder wire is ideal for electronics assembly, PCB soldering, and general industrial applications where reliable wetting and easy flux cleanup are required.