The number of electro plating plants in Japan is declining, which is a serious problem for local fastener manufacturers. Due to the closure of some plating plants in the metropolitan area, fastener manufacturers were forced to choose a new outsourced electroplating plant. However, the current situation is that electroplating can not keep up with the shipment even though there are several electroplating factories cooperate with.Fastener manufacturers even invest more and more funds to extend the electroplating factories' work time.Due to the lack of successors, high costs,low profits, and the problem of wastewater discharge,more and more electroplating factories in the metropolitan area are closed down.