- Business
- H-One Co., Ltd. H-ONE CO., LTD. manufactures and sells automotive frame parts, dies, welding equipment, and related components primarily for the automotive industry; the company produces high-performance automobile frames including front bulkheads, side frames, rear frames, rear wheelhouses, pillars, door beams, cross members, inside sills, wheelhouses, and floor frames, as well as special products such as metal separators for fuel cell stacks and 3DQ body frames using three-dimensional hot bending and direct quench technology developed jointly with Nippon Steel Corporation and Nippon Steel Pipe Co.; it also offers dies with in-house integrated production from materials to finished products, welding equipment featuring digital simulations for flexibility in stack welding and small-volume production, and parts for motorcycles, power products, and general-purpose engines such as control levers, yoke rotors, and pushrods utilizing dissimilar material joining technology for steel and aluminum. H-One Co., Ltd. operates through four business segments encompassing Japan, Europe and North America, China, and Asia and Oceania, with manufacturing bases and subsidiaries in countries including the United States, Mexico, Thailand, Indonesia, India, and China, serving major automakers with a focus on safety, comfort, weight reduction, and sustainability through advanced press processing, welding, and high-strength steel technologies. Founded in 2006 through the merger of Hirata Technical Co., Ltd. (originating from 1939) and Hongo Co., Ltd. (originating from 1959), the company maintains its headquarters in Omiya-ku, Saitama-shi, Saitama, Japan, and employs approximately 7,000 people consolidated across 14 foreign bases. Recent developments include the establishment of WH New Energy Auto Parts Industries Inc. in Hubei, China, in September 2022; listing on the Prime Market of the Tokyo Stock Exchange in April 2022; closure of the Nakatsu Plant in Oita, Japan, in June 2022; the transfer of its consolidated subsidiary H-ONE India PVT., Ltd. to Belrise Industries Ltd. in March 2025; and the August 2025 announcement of a wholly owned subsidiary, KTH TEXAS Inc., in Texas, United States, with operations planned to start in January 2028 to expand supply systems and sales channels amid growing automaker presence in the region.