Profile: Shanghai Hualun Instruments & Electronics Co., Ltd. manufactures electrical connectors of low frequency circular, miniature and heavy duty connectors. We are an ISO9001:2000 and ISO14001:2004 certified company. Our product includes heavy duty connector, circular connector, bayonet coupling, thread coupling, miniature solder, miniature crimp, and oil machine connector. Our heavy duty connectors are interchangeable with international equivalent spec products and widely applied in electric power, track traffic & in fields of various mechanics & industrial automation control. Our bayonet coupling connector features a special contact retaining design, and applies beryllium copper contact so that the retaining clip is replaced in the insert structure to protect contacts efficiently without any damage.