Since its establishment in 1979, the company has been a specialist manufacturer engaged in the development and production of metal products for social infrastructure, typified by urban tunnels. Building on extensive experience and advanced technical capability, we contribute to infrastructure development and countermeasures against aging, delivering products and services that carry the way forward to the next generation.
Business / Services
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BUSINESS 01/03
Welding / Processing
In the manufacture of hardware for civil engineering and construction, we produce high-quality components using welding and a range of processing technologies. Our main focus is joint hardware used in urban tunnels.
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BUSINESS 02/03
Manufacture and Sale of Patented Products
We manufacture and sell the "SB Joint," a patented product developed in-house. Combining ease of installation with durability, it is used primarily in urban tunnel construction.
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BUSINESS 03/03
Product Development
Drawing on our specialist expertise and facilities, we also plan and develop new products. Through product development that responds to aging infrastructure and on-site needs, we aim to help solve the challenges facing social infrastructure.
Company Profile
- Company Name
- JOINT KOGYO CO., LTD.
- Established
- August 1979 (April 1947 as Kokaji Kikai Seisakusho)
- Representative Director
- Shohei Kojima
- Capital
- ¥10,000,000
- Number of Employees
- 38 (as of July 2026)
- Business Activities
- Manufacture of civil engineering and construction hardware / Electric welding
- Bank
- Mizuho Bank, Katsushika Branch / Tokyo Higashi Shinkin Bank, Katsushika Branch
Sumitomo Mitsui Banking Corporation, Katsushika Branch / Awa Bank, Edogawa Branch
- Contact
- [Head Office]
TEL：03-3691-2200
FAX：03-3696-4044
[Noda Plant]
TEL：04-7198-4171
FAX：04-7198-1194 - Locations
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[Head Office]
〒110-0016
Asahi Building 5F & 6F, 2-31-3 Taito, Taito-ku, Tokyo
View on Google Maps
[Noda Plant]
〒270-0229
3-23-11 Namiki, Noda City, ChibaView on Google Maps
