Message from the President

President Mitsutake.

Toa Koki celebrated the 70th anniversary of its founding in June 2014. This achievement was made possible by the earnest support and guidance of our customers, suppliers, financial institutions, government agencies, and shareholders as well as the diligence and devotion of our employees over the years. I would like to take this opportunity to express my deep appreciation to all of these people.

In order to continue manufacturing quality products that our customers can feel secure in using, we will use as a base the particular technologies and skills we have developed up to now as we continue working to further improve employee training, develop manufacturing technologies, and effectively utilize our equipment not only for ships but also in power generation and other fields. Thank you for your continuous support as we move forward with all of our projects.

Wataru Mitsutake, President

About the company

Company overview


[ Company Policy ]

Our company aims to value our customers, business partners, employees, and shareholders, and work with them to ensure increased satisfaction.

[ Motto ]

1. High-quality, reasonably priced products
2. Strict observance of deadlines
3. Preventing industrial accidents and promoting good health

(as of June 11, 2018)
Company Name TOA KOKI CO.,LTD.
Business Activities 1. Manufacture and sale of internal combustion engine components
2. Manufacture and sale of ship-related machinery & apparatus, general machinery & apparatus, and associated components
3. Manufacture, sale, installation, and repair of machine tools and industrial machinery
4. Business related to solar power generation and the sale of electricity
5. Business activities related to the abovementioned activities
Company Officers President and Representative Director
Executive Managing Director
Managing Director
Managing Director
Director, Quality Assurance Dept.
Director, Sales Dept.
Director, Production.
(Omuragata & Yokota Factory)
Director, Chief of the general affairs
Wataru Mitsutake
Kosuke Sakaguchi
Hirofumi Yamamoto
Takahiro Matsuo
Katsuaki Aino
Keisaku Ogi
Shinji Miyamoto
Tatsumasa Yamaguchi
Ryusuke Ogawa

Toshihiro Tsuruda
Yoshinori Yano
Masafumi Morita
Establishment Jun.21,1944
Capital 100 million yen
Total Sales 5.9 billion yen (2017)
Employees 300(272 men, 28 women)
Organizational Structure PDF file(Jan,2018)
Location Headquarters/Tanda factory:1430-30 Yamaura, Kashima, Saga Prefecture 849-1314
Telephone: +81-954-63-3236/fax: +81-954-63-3240
Omuragata Factory: 305-2 Furueda, Kashima, Saga Prefecture 849-1321
Telephone: +81-954-63-1303/fax: +81-954-62-1222
Yokota Factory: 62-1 Takatsuhara, Kashima, Saga Prefecture 849-1311
Telephone:+81-954-69-0131 / FAX:+81-954-69-0132
Banks The Bank of Saga
Shoko Chukin Bank
MUFG Bank, Ltd.
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Overview of Toa Koki’s Business Activities and Certifications Held

Toa Koki casts cylinder liners, cylinder covers, cooling jackets, bases for stern tube bearings, seal liners, turbocharger casings, and other components for ship main engines, main engines for power generators, ship components, and internal combustion engines for land-based auxiliary equipment. We deliver these products as post-processed finished products to diesel engine licensers and licensees. These products are subjected to standards inspections by the classification societies listed below to ensure they meet our customers’ required specifications. As of 2015, we have been certified as a manufacturing Factory by the classification societies listed below. We also manufacture cast components for all types of industrial machinery.

Cylinder liner
Date of CertificationName of Certification-granting OrganizationAbbreviation
January, 1966Det Norske VeritasDNV
October, 1969Ministry of Land, Infrastructure, Transport and Tourism (Japan)JG
May, 1979Lloyd’s Register (UK)LR
October, 1981Germanischer LloydGL
July, 1991Korean Register of ShippingKR
June, 1999China Classification SocietyCCS
January, 2003Nippon Kaiji Kyokai (ClassNK)NK
April, 2005Bureau Veritas (France)BV
July, 2007American Bureau of ShippingABS
February, 2008Registro Italiano NavaleRINA

About receiving LRQA certification from Lloyd’s Register

ISO attestation acquisition

ISO 9001 (certified in February 1995)
ISO 9001: Quality management system. It is not designed simply to ensure that good products are manufactured; in addition, it requires “the management and continuous improvement of a system designed to provide improved products and services.” Companies create and operate such systems in accordance with common global rules.

ISO 14001 (certified in June 2014)
ISO 14001: Known as the “environmental ISO,” this certification indicates that the company has a system in place designed to continually make improvements to activities, products, and services that affect the environment in order to protect the environment.

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Timeline of Toa Koki

The History of Toa Koki

June, 1944The company was founded with the intention of manufacturing ship components with a total capital of 190,000 yen. Casting operations were begun in a borrowed warehouse belonging to Izaki Sake Brewery in Yokota, Kashima-machi on September 1, 1944.
April, 1946Toa Koki began making ship engine components when it received an order from the Ship Administration Association (Senpaku Uneikai) for engine components for use in a Landing Ship, Tank (LST) on loan from the United States. This was the Toa Koki’s entrance into the field of manufacturing engine components for shipyards and ship companies.
July, 1961A contemporary photo of the Yokota Factory. The No. 1 Foundry (whitish building; currently the Yokota No. 4 Machine Shop) is seen near its completion. In the foreground can be seen the foundry completed in 1956 and a foundry which is the oldest building on the property: the No. 1 Machine Shop, which was dismantled in October 2014. The traces of the brewery are clearly visible.
Yokota Factory in 1961 Yokota Factory in 1961
February, 1980Successfully manufactured 20,000 large cylinder liners (inner diameter of at least 620 mm).
Yokota Factory in 1981 Yokota Factory in 1981
May, 1986Completion of the Omuragata Factory.
Omuragata Factory in 1986 Omuragata Factory in 1986
October, 1992A foundry and rough processing Factory are constructed at the Tanda Industrial Park and begin operations.
Tanda Factory in 1992 Tanda Factory in 1992
A tour of the Factory A tour of the Factory
June, 1994Toa Koki celebrates the 50th anniversary of its founding.
October, 2001Construction to expand the Tanda Rough Processing Center is completed.
December, 2004The head office building and main Factory are successfully relocated to 1430-30 Yamaura, Kashima City (Tanda Factory).
Tanda Fctory in 2005 Tanda factory in 2005
Head office building Head office building
March, 2005Toa Koki celebrates the 60th anniversary of its founding and holds a commemorative ceremony for its relocation and newly constructed facilities.
September, 2008Operations resumed after renovations made to the Yokota Factory buildings and equipment are completed.
Yokota Factory Yokota Factory
November, 2011Vocational skill training begins at the “Renma Skill Up Training Center.”
Renma Renma Skill Up Training Center
Renma Training at the Renma Center (Machining)
Renma Products created (cast) at the Renma Center
May, 2012Expansion of the No. 3 Machine Shop at the Omuragata Factory and the addition of machine tools completed.
May, 2013Power generation begins at the Solar Factory TOA (300 kWh)
Solar Factory TOA Solar Factory TOA
June, 2014Toa Koki celebrates the 70th anniversary of its founding.
Tanda Factory in 2013 Tanda Factory in 2013
April, 2017We changed the capital to 100million yen by reducing capital without compensation.
April, 2017“TOA KOKI MUSEUM” opened at Yokota Factory.
August, 2017Machine Production Department established.
January, 2018New parking lot on the west side of the Tanda Factory.
New parking New parking
May, 2018Start of factory operations at the Machine Production Department.
Machine Production Department Machine Production Department
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