Corporate data (as of July 2023)

Trade name DPI Ltd.
Foundation Founded in 1933 as a special steel tool manufacturing company
Establishment Established in 1948 as Tokushu Seiko Co., Ltd. in Nerima-ku, Tokyo
Representative Tomoyuki Nakashima, Representative Director and President
Capital 90 million yen
Shareholders Daido Steel Co., Ltd., Daido Kogyo Co., Ltd.
Number of employees 239 people
Production items High-performance precision automotive parts such as turbochargers
Precision machined parts such as compressors
Design, development, and manufacture of power transmission devices such as couplings and related parts
Certification etc. IATF16949 SRI No.6286-01
ISO 9001 JICQA No.0316
ISO 14001 JICQA No.E772

Corporate history

April 1933 Founded as Tokushu Kougu Seisakusho, a manufacturer of special steel product
June 1937 Became independent as Tokyo Tokushu Kougu Seisakusho
May 1948 Established as Tokushu Seiko Co., Ltd. in Nerima-ku, Tokyo. Capital: 2 million yen
September 1953 Capital increased to 4 million yen
May 1957 Capital increased to 9 million yen
May 1958 Capital increased to 12 million yen
May 1961 Capital increased to 30 million yen
Asaka Plant completed in Asaka, Saitama
March 1962 Capital increased to 60 million yen
June 1963 Technical partnership with Pinch Bamag AG, Germany regarding electro-magnetic clutch
January 1965 Transferred and consolidated Tokyo Plant to Asaka Plant
May 1968 Transferred and consolidated Head Office to Asaka Plant
November 1973 Technical partnership with Formsprag Co., a division of Dana Inc., USA regarding coupling
April 1976 Daido-Sprag Ltd. was established in Asaka, Saitama. Capital: 100 million yen
Investment ratio: Dana Inc. (40%)
        Daido Steel Co., Ltd. (30%)
        Tokushu Seiko Co., Ltd. (20%)
        Daido Kogyo Co., Ltd. (10%)
December 1976 Transferred and consolidated Head Office and sales office of Daido-Sprag Ltd. to Toranomon, Minato-ku.
June 1978 Daido Steel Co., Ltd. has taken a capital stake in Tokushu Seiko Co., Ltd.
Investment ratio (42.4%)
November 1983 Tokushu Seiko Co., Ltd. introduced TQC and JK.
ITS30 activities started.
December 1994 Dana Inc. sold its holdings in Daido-Sprag Ltd. to Daido Steel Co., Ltd.
Dissolved the joint venture relationship with Dana Inc.
September 1995 Established DPI Ltd.
Merged with Daido-Sprag Ltd.
Transferred Head Office to Nishiikebukuro, Toshima-ku, Tokyo.
Capital: 90 million yen
April 1996 Established Ranzan Plant in Ranzan, Saitama.
May 1996 Transferred and consolidated Asaka Plant and Sagami Plant to Ranzan Plant.
April 1998 Acquired ISO 9001 and completed Musashi Dormitory in Ranzan-machi.
January 2004 Acquired ISO 14001
August 2006 Expanded Ranzan Plant
October 2014 Technical partnership with TB Wood’s Inc. (Altra Group) regarding TORSIFLEX® couplings
October 2015 Opened Osaka office
March 2017 Acquired ISO/TS16949 certification
April 2018 Acquired IATF16949 certification
July 2021 Became a 100% subsidiary of Daido Steel Group through share consolidation

From design to manufacturing and quality control,
DPI will use its unique know-how
to meet your requests.

Inquiries TEL
03-5956-9175 (Parts business)/03-5956-9176 (Coupling business)
Business hours: 9:00 a.m. - 5:00 p.m.
(Excluding Saturdays, Sundays, holidays, and our company's holidays)

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