Founded Tsukami Manufacturing Co., Ltd. in Ebara District, Tokyo Prefecture, to supply domestic precision measuring instruments and machine tools previously dependent on foreign sources.
Founding
Domestic production of block gauges.
Relocated headquarters and factory to Shimamaruko-cho, Kamata-ku, Tokyo Prefecture.
Changed company name to Toyo Seiki Co., Ltd.
Became one of the first six companies licensed to manufacture machine tools in Japan and started production of the country's first zigging center (Type 4).
Merged with Mitsui Work Machine Co., Ltd., changed company name to Mitsui Precision Machinery Co., Ltd., and established Okegawa Manufacturing Plant.
Relocated headquarters to Nihonbashi-Muramachi, Chuo-ku, Tokyo.
Commenced production of the auto tricycle 'Orient'.
Changed company name to Toyo Seiki Co., Ltd. (establishment of the current company).
Establishment
Changed company name to Mitsui Precision Machinery Co., Ltd.
Started production of the Type 3 zigging center and received the 1st Akashi Memorial Award from the Society of Precision Engineering (now the Precision Engineering Society).
Commenced production of rotary-type air compressors.
Participated in the establishment of Sansei Industrial Co., Ltd. (now Sansei Co., Ltd., a consolidated subsidiary).
Signed a memorandum of understanding with Hino Motors Manufacturing Co., Ltd. (at the time) regarding the manufacture of four‑wheel trucks, and began production of the small four‑wheel truck "BriSka".
Commenced contract production of the medium four‑wheel truck "Ranger" for Hino Motors Manufacturing Co., Ltd. (at the time).
Started production of our first machining centers, JidicH5B and JidicH6B.
Commenced production of Z‑screw type air compressors.
Moved the Oke‑gawa factory to Kawashima Town, Hikawa District, Saitama Prefecture, and renamed it Kawashima Factory.
Established a joint venture, MITSUI SEIKI (U.S.A.), INC. (now a consolidated subsidiary), with Mitsui & Co., Ltd. in the United States.
Started production of the industry’s first water‑lubricated oil‑free compressor ZU series.
The vertical machining center VR3A won the 13th Machinery Industry Design Award Minister of Trade and Industry Award (Grand Prize).
Commenced production of the scroll‑type compressor ZS series.
Moved corporate functions from Nihonbashi Muromachi, Chuo‑ku, Tokyo, to the Tokyo factory.
Obtained ISO 9001 certification for the precision machinery division.
Obtained ISO 9001 certification for the industrial machinery division.
Established SanTech Co., Ltd. (now a consolidated subsidiary).
Following the consolidation of business offices, transferred the Tokyo factory division to Kawashima Factory and renamed it the Head Office Factory; the sales headquarters function and Tokyo sales office moved to Shinagawa‑ku, Tokyo (Tennōzu Isle) and were renamed Tokyo Headquarters.
Obtained ISO 14001 certification for the Head Office Factory.
The water‑lubricated oil‑free inverter compressor i-14000/ZU series received the 2005 (Heisei 17) Excellence Award for Energy Equipment and the Chairman’s Award from the Japan Machinery Industry Federation.
The 5‑axis vertical machining center Vertex550-5X won the 36th Machinery Industry Design Award "Nippon Power (Nippon Brand) Award".
Established Mitsui Seiki (Shanghai) Equipment Maintenance Service Co., Ltd. in the People’s Republic of China.
Established Mitsui Seiki (Thailand) Co., Ltd. in Thailand.
Consolidate the Sales Headquarters functions (Tokyo HQ) into the head office factory.
Hold a 90th anniversary celebration event.
In response to the addition of a new compressor lineup, we will hold MTF2026. The Omiya venue will be held on November 17-18, 2026; the Osaka venue on December 8-9; and the Nagoya venue on February 9-10, 2027. The venues are respectively Omiya Sonic City, OMM A Hall, and Port Messe Nagoya Convention Hall A.
Mitsui Seiki Kogyo Co., Ltd. has added a new compressor to its lineup and will hold SMTF 2026 at seven locations nationwide: Mt. Fuji on August 27, Himeji on September 9, Chiba on September 11, Utsunomiya on September 15, Kariya on October 13, Hiroshima on November 11, and Oita on December 16. The company looks forward to welcoming visitors.
Mitsui Seiki will add new compressor models to its lineup and hold Smart MTF 2026 at seven locations across Japan. Events will run from August 27 to December 16, from 10:00 a.m. to 4:00 p.m. We look forward to welcoming you.
We will exhibit at JIMTOF 2026, held at Tokyo Big Sight from October 26 to 31. Exhibits include the HPX63-5X five-axis horizontal machining center, designed for greater rigidity and dynamic accuracy; the J370G jig grinder, engineered for high roundness and cylindricity; the ZV15AX4-R oil-cooled inverter compressor; and the quiet, low-vibration, high-efficiency DS-085A-R. We would be pleased if you could visit.
We will exhibit at JIMTOF 2026, held at Tokyo Big Sight from October 26 to 31. Exhibits will include the HPX63-5X five-axis horizontal machining center, designed for greater rigidity and dynamic accuracy; the J370G jig grinder, engineered for roundness and cylindricity; the ZV15AX4-R oil-lubricated inverter compressor; and the quiet, low-vibration, high-efficiency DS-085A-R. Visit us at booth E3029 in East Hall 3. Hours are 10:00 a.m.–5:00 p.m., with closing at 4:00 p.m. on the final day.
Mitsui Seiki Kogyo extends its heartfelt sympathies to everyone affected by the 2024 Noto Peninsula earthquake and their families, and wishes the affected areas safety and recovery. The company has its support systems for machine tools and compressors fully prepared. For assistance, contact the Seiki Service Section at 049-297-5551 or the Industrial Machinery Service Section at 049-297-4711.
Mitsui Seiki extends its heartfelt sympathies to everyone affected by the 2024 Noto Peninsula Earthquake and their families, and wishes them safety and a swift recovery. We have put in place full support to help restore affected areas and resume production. For inquiries, please contact the Machine Tool Service Section for machine tools or the Industrial Machinery Service Section for compressors.
Mitsui Seiki Kogyo Co., Ltd. announces the relocation of its office in the Tokyo metropolitan area.
Mitsui Seiki Kogyo Co., Ltd. announced the relocation of its Tokyo metropolitan area office on June 29, 2023. See the official website for details.
On May 12, 2023, Mitsui Seiki Kogyo Co., Ltd. announced its efforts to comply with the Osaka Prefecture living environment conservation ordinance. Details are described in Osaka Prefecture's guide flyer and separate materials.