| 1939 | March | Founded the Hamaguchi Steel and Co. at 3 Kitahorie, Nishi-ku, Osaka City Began sales of imported steel materials and steel gas pipes |
|---|---|---|
| 1946 | June | Incorporated and renamed the NIKKEN SANGYO Co., Ltd. |
| 1953 | April | Signed a dealership contract with the Mitsubishi Corporation |
| 1971 | April | Relocated the manufacturing facility for steel pipes lined with |
| 1971 | October | Separated the processing division to newly establish the Nikken Kako Kogyo Co., Ltd. |
| 1976 | November | Completed the Nikken Building in Itachibori, Nishi-ku, Osaka City |
| 1977 | April | Constructed the Kishiwada Plant in Rinkaicho, Kishiwada City, Osaka |
| 1979 | August | Accredited the Kishiwada Plant with the Japan Water Works Association as a certified plant |
| 1991 | June | Constructed the Wakayama Plant in Nadacho, Gobo City, Wakayama |
| 1999 | April | Constructed the new Nikken Sangyo Shinonome Warehouse in Koto-ku, Tokyo |
| 2002 | February | Invested in establishing the Akahagi Flange Co., Ltd. |
| 2003 | April | Enhanced the lined steel pipe processing facility at Kishiwada Plant |
| 2003 | July | Introduced a new lined steel pipe processing facility at Wakayama Plant |
| 2004 | June | Merged Nikken Sangyo, Nikken Kako Kogyo, and Nikken Fudosan to form the NIKKEN SANGYO Co., Ltd. Accredited the Wakayama Plant with the Japan Water Works Association as a certified plant |
| 2007 | March | Introduced new 3D laser processing machines at Wakayama Plant |
| 2007 | November | Focused management resources on the manufacturing division |
| 2008 | June | Opened Nishi-Akashi Branch |
| 2009 | March | Constructed the new Mizushima Warehouse in Okayama |
| 2010 | February | Established Nikken International Korea（NIK） in South Korea |
| 2010 | April | Established a new plant for manufacturing lined steel pipes at Wakayama Plant |
| 2010 | July | Invested in Korean manufacturer SHPAC to start manufacturing cylinders on a group basis |
| 2011 | January | Opened Hanoi Office in Vietnam |
