Kohoku Kogyo CO.,LTD. manufactures and sells lead terminals for aluminum electrolytic capacitors, optical components and devices for optical fiber communication network, and precision components using quartz glass materials in Japan, China, rest of Asia, England, the United States, and internationally. It offers lead terminals, including standard type, burr-free type, edge-free type, one-side rib type, round 4-corner type, vibration-resistant type, front-back discriminative type, welded resin coating, and round bar resin coating, as well as rounding and anodic oxidation processing, and lead terminal materials. The company also provides optical communication components and devices, such as in-line optical isolators, hybrid optical isolators, optical filter devices, optical circulators, variable optical attenuators, polarized optical fiber assembled products, faraday rotators, high purity silica glasses, optical fiber preforms, and specially assembled multi-channel optical fiber array, as well as optical components for submarine cable and optical fiber array assembled with hermetic feedthrough. The company was incorporated in 1959 and is headquartered in Nagahama-shi, Japan.