|Head Office & Tsukuba Plant||1158, Takamori, Sakuragawa, Ibaraki 309-1297, Japan
Tel. 0296-58-5161 (key)
|Sales Division||4F, UNIZO Iwamoto-cho 3-chome Building, 3-5-5, Iwamoto-cho, Chiyoda-ku, Tokyo 101-0032, Japan
|Osaka Sales Office||9F, Shin-Osaka Daiichi Seimei Bldg., 5-24, Miyahara 3-chome, Yodogawa-ku, Osaka 532-0003, Japan
|1960||Yamamoto Hatsujo Bunki, Inc. (founded in 1908) and Nitto Industries, Inc. were merged together, and Sumikin Hatsujo Co., Ltd. was formed as an affiliate of Sumitomo Metal Industries, Ltd.
Head Office: Amagasaki
Capital: 190 million yen
|1965||Head Office moved to Fujisawa City.
Acquired Nitto Industries, Inc. and Amagasaki Factory was opened.
Capital: 200 million yen
|1970||Factories were united in Fujisawa Factory.
Capital: 300 million yen
|1975||NHK Spring Co., Ltd. acquired shares from Sumitomo Metal Industries, Ltd. and company name was changed to Sumihatsu Co., Ltd.|
|1978||Acquired Nikken Spring, Inc., an affiliate of NHK Spring Co., Ltd.
Capital: 345 million yen
A new factory for spring clips was completed in the corner of in the Industrial Complex at Yamato-mura, Ibaraki.
|1981||Closed Fujisawa Factory.
Completed a complete transfer from Fujisawa to establish our Tsukuba Plant.
|1982||Completed production facilities for automobile coil springs.|
|1983||Moved Head Office to Iwamoto-cho, Chiyoda-ku, Tokyo.|
|1995||Established Sumihatsu Service Co., Ltd. as an affiliate.|
|1997||Manufacturing of Balancer Assy was started.
Business cooperation agreement was signed with Pandrol Track Systems Ltd.
|1998||Started full-scale production of the Pandrol clips.|
|1999||ISO 9001 was certified (leaf spring, C2)|
|2000||ISO 9001 was certified (industrial machinery, railways).
Sumihatsu Services, Inc. started elderly care business.
|2001||Started production of synthetic sleepers.|
|2002||Ended production of coil springs of automobiles.|
|2003||Signed an agreement to make rail fastening devices for the Taiwan Shinkansen.
All shares owned by Sumitomo Metals (Kokura), Ltd. were transferred to NHK Spring Co., Ltd.
ISO 14001 was certified.
|2007||Installed LNG satellite equipment.
Enlarged the building of the second leaf spring plant.
|2009||Started receiving full-scale orders of torsion bars for railway vehicles.|
|2015||Started Sumihatsu Service Co., Ltd. outpatient care (day service) business.|
|2020||Moved our Head Office to Sakuragawa City, Ibaraki Prefecture.|