| Company Name | Sunouchi Corporation |
| Headquarters and Factories | Second Iron and Steel Complex, 46 Minato, Urayasu-shi, Chiba 279-0024 Japan Telephone: +81-47-353-8751 Fax: +81-47-353-5381 |
| Sales Offices | Higashi-Hiroshima Warehouse, Osaka Sales Office, and West Japan Sales Office |
| Establishment | April 1, 1984 |
| Capital | 20 million yen |
| Representative | Seiichiro Baba, President |
Foundation
| 1914: | Isaji Takasuka founded a steel material dealer, Takasuka Isaji Shoten Co., Ltd., in Itachibori, Osaka. |
| 1923: | Opened Tokyo Branch in Kyobashi, Tokyo. |
| 1928: | Renamed as Takasuka Shoten, succeeded by Etsuichi Takasuka, and the head office placed in Tokyo. |
| 1950: | Reorganized as Sunouchi Shoten Corporation, with sales offices opened in Omiya and Hachioji. |
| 1965: | Constructed a plant in Iron and Steel Complex, Urayasu, and started partial processing and slit processing for CT and H section steel. |
| 1978: | Started manufacturing steel end tabs. |
Establishment
| 1984: | Newly established Sunouchi Corporation and separated the manufacturing and sales of end tabs and other products. |
| 1990: | Started manufacturing and sales of ceramic tabs and backing materials. |
| 1992: | Established West Japan Sales Office and Osaka Sales Office. |
| 1995: | The Great Hanshin-Awaji Earthquake led to an increase in demand for backing materials and end tabs. |
| 1996: | Imported ceramic tabs and gouging carbons from China. |
| 2002: | Started manufacturing and sales of Kadopita, a product developed by Nippon Steel Metal Products Co., Ltd. |
| 2004: | Started selling a backup material for vessels jointly developed with WUHAN TIANGAO WELDING CO.,LTD. |
| 2007: | Established Rushan City Xuzhisheng Special Ceramics Co.,Ltd., in Shandong Province, China, for the manufacturing of ceramic products. |
| 2008: | Established Higashi-Hiroshima Plant for the manufacturing of steel products. |
| 2009: | Established Ayase Warehouse. |
| 2011: | Expanded Higashi-Hiroshima Plant after the occurrence of the Great East Japan Earthquake. |
| 2016: | Started development of ceramic backing materials for reinforcing bar joints. |
| 2017: | Started sales of ceramic backing materials for reinforcing bar joints. |