Komaihaltec Inc.
Japanese engineering firm specializing in steel bridges, steel structures, and wind power solutions.
Last updated September 26, 2026
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Overview
Komaihaltec Inc. is a Japanese engineering and construction company formed in 2010 through the merger of Komai Iron Works Co., Ltd. and Harutec Co., Ltd. The company is headquartered in Nishi-ku, Osaka, and is a leading player in the design, fabrication, and erection of steel bridges and steel structures. Its bridge division has been involved in numerous long-span bridge projects in Japan, including the Akashi Kaikyo Bridge. The company also operates in the steel frame and environmental sectors, developing wind turbines such as the KWT300 and manufacturing towers for offshore wind turbines. With a workforce of 652 employees as of March 2024, Komaihaltec reported sales of 55.4 billion yen in fiscal 2023. The company is publicly listed and continues to expand its renewable energy business, supported by government initiatives like the NEDO Green Innovation Fund.
History
Komaihaltec Inc. was established on October 1, 2010, through the merger of Komai Iron Works Co., Ltd. and Harutec Co., Ltd. Its origins trace back to 1883 when Komai Kihei Shoten, a architectural hardware business, was founded. In 1943, Komai Iron Works Co., Ltd. was incorporated, and it listed on the Osaka Securities Exchange in 1961 and the Tokyo Stock Exchange in 1984. The company changed its name to Komai Iron Works Co., Ltd. in 1989. Harutec Co., Ltd. was founded in 1921 by Risaku Harumoto as a architectural hardware contractor, incorporated as Harumoto-gumi Co., Ltd. in 1941, and later renamed Harumoto Iron Works Co., Ltd. in 1951. It listed on the Osaka Securities Exchange in 1961 and the Tokyo Stock Exchange in 2000, changing its name to Harutec Co., Ltd. in 2001. After the merger, Komaihaltec moved its head office to Nishi-ku, Osaka, in 2012. The company has been involved in major bridge projects, including the Akashi Kaikyo Bridge, and has expanded into wind power, developing the KWT300 wind turbine and manufacturing offshore wind turbine towers. In 2021, it received support from the NEDO Green Innovation Fund to build a large wind turbine tower manufacturing plant at its Futtsu Factory, which was completed in 2026.
Komai Kihei Shoten, a architectural hardware business, is founded.
Risaku Harumoto starts a architectural hardware contracting business.
Harumoto-gumi Co., Ltd. is incorporated.
Komai Iron Works Co., Ltd. is incorporated.
Harumoto Iron Works Co., Ltd. is renamed.
Komai Iron Works lists on the Osaka Securities Exchange; Harumoto Iron Works also lists on the Osaka Securities Exchange.
Komai Iron Works lists on the Tokyo Stock Exchange.
Komai Iron Works changes its name to Komai Iron Works Co., Ltd.
Harumoto Iron Works lists on the Tokyo Stock Exchange First Section.
Harumoto Iron Works changes its name to Harutec Co., Ltd.
Products and positioning
Top-tier bridge manufacturer and advanced steel structure fabricator, expanding into renewable energy solutions.
KWT300 Wind Turbine
A wind turbine developed by Komaihaltec, leveraging advanced steel structure technology.
Offshore Wind Turbine Towers
Large towers manufactured at the Futtsu Factory for offshore wind turbines.
Hybrid Survey System
A 3D measurement system combining UAV, 3D laser scanner, and total station for bridge construction.
Pipe Slab
A steel-concrete composite deck with ribs and pipes, offering high load capacity and durability.
TMD Device 'KOMET'
A tuned mass damper for controlling wind-induced vibrations in large structures.
Sources5 sources
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