Hexagon socket cap screws typically require surface treatment, which includes various methods such as electroplating, blackening, oxidation, phosphating, and non-electrolytic zinc sheet coating. However, electroplated fasteners account for a significant portion in actual usage, particularly in industries like automotive, tractors, home appliances, instruments, aerospace, and telecommunications. For threaded fasteners, in addition to corrosion resistance, interchangeability of threads, or thread fit, is crucial. To meet both the "corrosion resistance" and "interchangeability" requirements of threaded fasteners in use, establishing specific electroplating standards is highly necessary.