Company Name | NAIGAI Co., Ltd. | ||||||||||||||||
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Chairman | Tetsuo Saito | ||||||||||||||||
President & CEO | Jun Ozawa | ||||||||||||||||
Company Address | Kamitoyooka-machi 561-8, Takasaki, Gunma Pref., ZIP: 370-0871 TEL. +81-27-340-1270 FAX. +81-27-340-1271 |
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Shinto Plant | Shinto-Village 3059, Kita-Gunma Gunma Pref., ZIP: 370-3504 TEL. +81-279-54-1270 FAX. +81-279-54-1271 |
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URL | http://www.aluminum-gravity.com | ||||||||||||||||
info@aluminum-gravity.com | |||||||||||||||||
Paid Up Capital | 96 Million JPY | ||||||||||||||||
Established in | January 1999 | ||||||||||||||||
Number of Employees | 36 | ||||||||||||||||
Site Area | 40,404m2 | ||||||||||||||||
Business Content | • Gravity die-casting of aluminum, both in low and high volume projects with highest requirements on geometrical complexity and pressure resistance. Production development from sand-casted prototypes to high volume serial production. • Other casting processes, e.g. low pressure die casting and H-Process • In cooperation with our partner company: |
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Equipment |
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Customers | DENSO etc. |
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Group Companies | Tokyo Foundry Co., Ltd. Simplex Naigai Castings Private Limited (India) |
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Co-operating Companies | Naigai Malleable Iron Co., Ltd. ![]() Aizu Kojou Co., Ltd. ![]() SAINT JEAN INDUSTRIES ![]() Ming Ming Aluminium Co.Ltd. ![]() |

March 1992 | Establishment by Naigai Malleable Iron Co., Ltd as the Gunma Plant for aluminum die-casting |
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January 1999 | Establishment of NAIGAI Co., Ltd. (no longer the Gunma plant of Naigai Malleable Iron Co., Ltd) |
December 2002 | receive a certification of "one company one technology" from the Gunma prefectural governor |
June 2004 | ISO9001 Certification |
June 2005 | ISO14001 Certification |
June 2007 | Start of new casting process development |
June 2011 | Development of a new casting technology, supported by Japan’s Ministry of Economy, Trade and Industry (METI) and classified as a "strategic technology advancement support project" |
January 2012 | Acquisition of Tokyo Foundry as a 100% subsidiary |
March 2013 | • "Small business IT management certification" awarded by the Ministry of Economy, Trade and Industry (METI) • Implementation of the 200kW solar power system |
December 2013 | Tokyo Foundry becomes the manufacturing base of NAIGAI |
21 July 2015 | Naigai and Tokyo foundry acquired the certification of a quality management system "ISO/TS 16949:2009". |
July 2016 | Naigai start the development the new Casting Technology supported by Strategic Technology Advancement Support Project. |
2 Feburuary 2018 | ISO14001:2015 Certification |
13 July 2018 | IATF 16949:2016 Certification |