History
| 1961 | May | Sanko Bolt Corporation was established in Shiogami-cho, Takamatsu |
|---|---|---|
| 1962 | Sep. | Sanko Bolt Y.K. established |
| 1966 | Feb. | Relocated to Taga-cho, Takamatsu |
| 1967 | Nov. | Y.K. was reorganized to Co., Ltd. |
| 1969 | Apr. | First business office out of Kagawa Prefecture, Kochi business office was established |
| 1973 | Mar. | Head Quarters building and warehouse were newly relocated to Asahimachi, Takamatsu |
| Apr. | Company name was changed to Sanko bolt Co., Ltd. | |
| Nov. | Sanko bussan Co., Ltd. established | |
| 1974 | Apr. | First business office in the main island Okayama business office was established in Uno |
| 1975 | Jun. | Seto Co., Ltd. established |
| 1976 | Apr. | First business office in Kansai, Osaka business office Established |
| Nov. | Aoi Kikou Co., Ltd. established | |
| 1979 | Feb. | Sanko kasetsu leasing Co., Ltd. established |
| 1980 | Apr. | Manufacturing and sales of Levelman started |
| 1985 | Apr. | Renamed to Sanko Co., Ltd. (CI introduced) |
| 1992 | Jun. | Construction business license application registered |
| 1999 | Oct. | SANKO PRECISION SINGAPORE PTE., LTD established |
| 2000 | May | SANKO PRECISION HONGKONG LIMITED established |
| 2001 | May | Certified according to ISO9001: 1994 |
| 2003 | Aug. | SANKO PRECISION SHANGHAI TRADING CO., LTD established |
| 2004 | Apr. | Certified according to ISO14001: 1996 |
| 2007 | Mar. | Head Quarters office (sales / office work division) was relocated to Asahishinmachi, Takamatsu upon business expansion |
| Sept. | Head Quarters office received "20th NIKKEI NEW OFFICE AWARD Shikoku New Office Promotion Prize" | |
| Oct. | SANKO PRECISION DALIAN TRADING CO., LTD established | |
| 2009 | Apr. | Aoi Kikou Co., Ltd. received a national Prize for Creativity from Minister of ECSS and Technology |
| Jul. | Osaka business office was moved up to Osaka branch | |
| 2010 | Sept. | Aoi Kikou Co., Ltd. Certified according to ISO/TS16949: 2009 |
| 2011 | Nov. | Korea Office established |
| 2012 | Sales of LOCK ONE | |
| Fab. | Aoi Kikou Co.Ltd. received a national prize for "The monodukuri Nippon Grand Award" from Minister of ET and Industry Aoi Kikou Co., Ltd. Received grand prix of "Ashihara Science Award" |
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| 2013 | Mar. | Logistics center was relocated |
| 2014 | Fab. | Okayama business office was moved up to Okayama branch |
| 2016 | Apr. | SPP SANKO PRECISION PHILIPPINES CORPORATION established |
| 2019 | Aug. | Sanko established the Seto Sales Division. |
| Oct. | Included Miura Seibyosho Y.K. in the Sanko Group | |
| 2021 | Dec. | Included San-ei seisakusho Co.,Ltd. in the Sanko Group |
| 2022 | May | Included Sikoku Stud Industries Y.K. in the Sanko Group |
| 2023 | April | Takamatsu Sales Office, Seto Sales Section of Fastener Division and Direct Sales Team were merged and promoted to Takamatsu Branch |