| 1978-04 |
OKUMOTO Matsuhiro established Chugoku Seira Co., Ltd. with a capital of 5 million yen in Iida, Hachihonmatsu-cho, Higashihiroshima-shi, and started the production of nuts. |
| 1978-04 |
東広島市八本松町飯田に資本金500万円にて奥本松博が中国精螺株式会社を設立し、ナットの生産を開始 |
| 1983-01 |
Second Plant opened in Zoka, Takaya-cho, Higashihiroshima-shi. |
| 1983-01 |
東広島市高屋町造賀に第二工場を開設 |
| 1985-01 |
Head Office relocated to Sasa, Hachihonmatsu-cho, Higashihiroshima-shi. |
| 1985-01 |
東広島市八本松町篠に本社工場移転 |
| 1985-04 |
Capital increased to 20 million yen. |
| 1985-04 |
資本金2,000万円に増資 |
| 1988-10 |
Kouchi Plant opened in Kouchi-cho, Kamo-gun, Hiroshima-ken. |
| 1988-10 |
広島県賀茂郡河内町に河内工場を開設 |
| 1990-02 |
Second Plant closed, and integrated with Kouchi Plant. |
| 1990-02 |
第二工場を閉鎖、河内工場に統合する |
| 1993-02 |
Acquired manufacturing rights for locking nuts (D-Lock nuts) from Disk Lock International in the United States. |
| 1993-02 |
アメリカ、ディスクロックインターナショナル社より緩み止めナット(ディーロック ナット)の製造権取得 |
| 1996-05 |
Summit Chugoku Seira Co., Ltd. established in Bangkok, Thailand, with a capital of 20 million Baht in a joint venture with CAPCO of the Summit Group. |
| 1996-05 |
タイ、バンコク市に資本金2,000万バーツでサミットグループのCAPCO社と合弁会社「サミット中国精螺株式会社」を設立 |
| 1999-11 |
ISO9002 and QS-9000 certification acquired. |
| 1999-11 |
ISO9002、QS－9000 認証取得 |
| 2001-01 |
Operations integrated at current location (Hachihonmatsu Iida, Higashihiroshima-shi). |
| 2001-01 |
現在地（東広島市八本松飯田）に統合移転 |
| 2001-04 |
OKUMOTO Matsuki appointed company president. |
| 2001-04 |
奥本松樹が代表取締役社長に就任 |
| 2006-02 |
ISO/TS 16949:2002 certification acquired. |
| 2006-02 |
ISO/TS 16949:2002 認証取得 |
| 2009-10 |
ISO/TS 16949:2009 certification acquired. |
| 2009-10 |
ISO/TS 16949:2009 認証取得 |
| 2011-06 |
Joint venture “BSG Metal Corpration Co.,Ltd.” established by “BOLTUN CORPORATION” and “Summit Chugoku Seira Co., Ltd.” in Guangzhou, China with a capital of US $1 million. |
| 2011-06 |
中国・広州市に資本金100万米ドルで「BOLTUN CORPORATION」設立、「サミット中国精螺株式会社」と合弁会社「BSG」を設立 |
| 2013-07 |
Affiliated subsidiary “C.S. (Thailand)” established in Chonburi Province, Thailand with a capital of 10 million Baht. |
| 2013-07 |
タイ・チョンブリ県に資本金1,000万バーツで関連子会社「C.S.(Thailand)」を設立 |
| 2014-03 |
Selected as one of “Vibrant GANBARU Small and Medium Enterprises 300” (METI). |
| 2014-03 |
「がんばる中小企業・小規模事業者300社」に選定（経済産業省） |
| 2015-03 |
Joined the “Iku-Boss Alliance in Hiroshima”. |
| 2015-03 |
「イクボス同盟ひろしま」に加盟 |
| 2017-08 |
Certified as a “2017 Certified Health & Productivity Management Outstanding Organizations (Small and Medium Enterprise Category)” (METI). |
| 2017-08 |
「健康経営優良法人2017（中小規模法人部門）」に認定（経済産業省） |
| 2017-09 |
Increased capital for affiliated subsidiary C.S. (Thailand) to 30 million Baht. |
| 2017-09 |
関連子会社C.S.(Thailand)資本金3000万バーツに増資 |
| 2017-11 |
IATF 16949:2016 certification acquired. |
| 2017-11 |
IATF 16949:2016 認証取得 |
