Company overview

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Vision of Daiwa Steel Tube and one to ONE

Here we have a 6-meter-long, 48mm diameter tube that just came off the line.
This simple form of tube will eventually take on many forms, supporting industries and people’s lives.
We wish that people all over the world can enjoy a safe, secure and healthy life, and create a successful future through the manufacture of tubes.
Therefore, we always emphasize on “one to ONE.”
From the manufacturers’ perspective (one) to the users’ perspective (ONE). From creating products (one) to creating value for users (ONE).
The small awareness of each of us involved in product manufacturing can lead to a great deal of value for society to connect with “one to ONE.”

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Company profile

Company name Daiwa Steel Tube Industries Co., Ltd.
Location Head office / Head office plant
4530-1 Washijuku, Sakura City, Tochigi Prefecture, 329-1411 Japan
TEL: +81-28-686-3581 FAX: +81-28-686-3589
Founded On September 1932
Established On February 1944
Representative Director Shinichiro Nakamura
Capital 100 million yen
Business Description Manufacture of galvanized steel tubes (various types of welded steel tubes for general structures, machine structures, etc.)
Steel tube processing (pinning, painting, marking, and other general processing)
Company Employees Number of employees: 177 (as of January 2020)
Major Banks Resona Bank, Ashikaga Bank, Sumitomo Mitsui Banking Corporation, Gunma Bank, Development Bank of Japan, etc.
Suppliers Nippon Steel, Marubeni Itochu Steel, Hanwa Kogyo, Nittetsu Bussan
Main Customers Marubeni Itochu Steel, Hanwa Kogyo, Nittetsu Bussan
Domestic Locations Tokyo Sales Office
1-2-1 Uchikanda, Chiyoda-ku, Tokyo, 101-0047 Japan 
3rd Floor, Dakota House
TEL: +81-3-5283-7031 FAX: +81-3-5283-7030

Osaka Sales Office
1-21-35 Edobori, Nishi-ku, Osaka City, Osaka, 550-0002 Japan 
7th Floor, The First Building
TEL: +81-6-6448-5205 FAX: +81-6-6448-6413

Nagoya Sales Office
3-2-32 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture, 460-0003 Japan 
6th Floor, Nishiki Axis Building
TEL: +81-52-950-7051 FAX: +81-52-950-7050

Sendai Sales Office
5-2-25 Oroshimachihigashi, Wakabayashi-ku, Sendai City, Miyagi Prefecture, 984-0002 Japan
TEL: +81-22-390-0570 FAX: +81-22-390-0571

Kyushu Office
1-9-14 Isouda, Hakata-ku, Fukuoka City, Fukuoka Prefecture, 812-0881 Japan 
2nd Floor, Saita Unso Building
TEL: +81-92-588-2588 FAX: +81-92-588-2590

Kansai Distribution and Processing Center
9-2-31 Nankohigashi, Suminoe-ku, Osaka City, Osaka, 559-0031 Japan
TEL: +81-6-6569-3731 FAX: +81-6-6569-3730
Overseas Locations Vietnam
Daiwa Lance International Co., Ltd.
Tan thuan Export Processing Zone Tan thuan Dong Ward, District 7, Ho Chi Minh City, S.R.Vietnam

Daiwa Anaya Steel Pvt.Ltd
1, Acharya Jagdish Chandra Bose Road, 4th Floor, Kolkata-700 020 India

DSTI Holdings, Inc.
13850 Benson Avenue, Chino, CA 91710 U.S.A


1932 Founder Tomeichi Nakamura established the Nakamura Pipe Manufacturing Factory in Taisho-ku, Osaka.
Started manufacturing and sales of welded steel tubes
1944 The factory was renamed as a corporate organization to Daiwa Steel Tube Industries Co., Ltd.
1970 President Matsuichi Nakamura appointed
1973 “Daiwa Z Process” is the world's first patented continuous hot-dip galvanized steel tube manufacturing method, and the first line was installed at Sakai Plant.
Started selling "Post Zinc"
1977 Headquarters moved to Nakanoshima, Kita-ku, Osaka City The second line of “Daiwa Z Process” was installed at Sakai Plant.
1981 Unity Inc. established
1987 Kanto Plant in Tochigi Prefecture completed as a production base for East Japan
2003 Shinichiro Nakamura appointed as President; Daiwa Steel Tube Industries Co., Ltd. and Unity Inc. acquired ISO9001 certification
2004 Sale of "Perfect Post Zinc" inner and outer surface hot-dip galvanized steel tubes
Super Light 700/STX700/STXR700 registered at the Ministry of Land, Infrastructure, Transport and Tourism’s “New Technology Information System (NETIS)”
2006 Acquired certification to label products with the new JIS mark.
2007 700N-class structural high-tensile carbon steel tubes certified as a building material designated by the Minister of Land, Infrastructure, Transport and Tourism
Headquarters functions consolidated into Tokyo Headquarters
East and West Sales Headquarters established in Tokyo and Osaka
2008 Changed the name of Unity Inc. to DSTI Holdings Ltd.
Perfect Post Zinc acquired the Construction Technology Examination Certification from the Public Works Research Center.
2011 Perfect Post Zinc registered at the Ministry of Land, Infrastructure, Transport and Tourism's “New Technology Information System (NETIS)”
Headquarters relocated to Sakura City, Tochigi Prefecture
Tokyo Sales Office established in Chuo-ku, Tokyo
2013 Daiwa Steel Tube Industries Co., Ltd. merged with DSTI Holdings Ltd.
Started manufacturing and sales of steel conduits
2016 Hazard Simulation Training Center established at the Headquarters Plant
2017 First STX networking event


Head office / Head office plant

4530-1 Washijuku, Sakura City, Tochigi Prefecture, Japan
TEL: +81-28-686-3581 FAX: +81-28-686-3589