In 1928, the company manufactured measuring instruments,
including block gauges and micrometers. Mitsui Seiki's
quest for "precision" had begun.
In 1935, the company developed our first medium sized
“#4” Jig Boring machine to Japan’s delight. For many
years the country wanted their own jig boring technology
rather than importing it. They referred to it as Japan’s
first “mother” machine because it was primarily used by
other machine tool builders to make their critical
precision components. It helped spark a fledgling
machine tool industry in Japan. Since then, jig boring
machines have become synonymous with the label “mother
Currently, Mitsui Seiki offers a lineup of machines
extending from jig boring machines, jig grinders,
horizontal and vertical machining centers, to 5-axis
machining centers and screw grinders that support the
world’s leading industries.
A Mitsui Seiki machine is created with a combination of
highly advanced design, engineering, processing,
assembling and measuring skills. In addition, an optimal
factory environment that takes into consideration
factors such as temperature is essential. Our dexterous
skills handed down over the last 70 years, and our
factory environment, allow Mitsui Seiki to create these
Mitsui Seiki's Machine Tools Division moved from Tokyo's
Ota Ward to Kawajima Town in Saitama Prefecture in
In the history of Mitsui Seiki, from its inception until
today, “the ultimate in precision” has continued to be
our central focus, our reason for existence. That will
remain at our core for years to come.
Here is a brief timeline of our hallmarks in
Founded as the first Japanese company to
manufacture precision machine tools
Merged with Mitsui Kosaku Kikai K.K. and
Mitsui Seiki Kogyo was established.
Consolidated the Okegawa Factory into the
Kawajima-Machi, Saitama Pref., expanding the
new Kawajima Factory
The office headquarters were moved to
Shimomaruko, Ota-Ku, Tokyo
The Tokyo Factory and the Kawajima Factory
were ISO9001 certified
New, larger capacity, environmentally
controlled machine tool factory opens in
Kawajima. The Tokyo factory consolidated into
the Kawajima factory to establish a new
state of the art, world-class manufacturing
The headquarters were ISO14001 certified.
Factory Expansion of Environment Controlled Assembly area for increased manufacturing capacity opens.