The name ATOM reflects its philosophy.
In science, an atom represents the smallest structural unit of matter.
In tooling, ATOM represents the pursuit of the smallest possible diameter—without compromise.

Since 1934, Saito Seisakusho Co., Ltd. has specialized in the development of high-performance small-diameter cutting tools under the brand name ATOM.

With decades of focused expertise in drills, end mills, and special cutters, ATOM has consistently operated at the forefront of micro-tool technology—long before small-diameter tooling became a global benchmark.

From carbide drills starting at an exceptional diameter of just 0.02 mm, ATOM has built a reputation for technical mastery in applications where scale demands absolute control and engineering discipline.

Today, ATOM is widely recognized as a leader in small-diameter tooling, supporting industries where accuracy, reliability, and process stability are critical.