Since its establishment in 1960 (Showa 35), Miharu has been dedicated to refining manufacturing methods for steel products, particularly focusing on welded rings as an alternative to forged products. We have continually honed our techniques for these ring products. Currently, we operate our manufacturing facility in Sakai City, Osaka Prefecture.

In July 2012, we obtained ISO 9001 and ISO 14001 certifications.
Certification scope: Manufacturing of welded rings through cold bending processes.

In 2003, we obtained patents for equipment and processing technology that roll rings into irregular cross-sections and integrally bend L-shaped materials.
Countries where patents were obtained: Japan, South Korea, Hong Kong, the United States, Taiwan, China, India, and six EU countries (United Kingdom, Germany, France, Italy, Belgium, Sweden).

Osaka Manufacturing Excellence Award
In Osaka, there are many companies that possess unique, one-of-a-kind technologies. These companies have overcome numerous economic fluctuations and fierce price competition through tireless efforts to refine their skills and advance their technologies. They also continue to grow with new technologies and products in fields such as environment, energy, and life sciences. Miharu has been selected for the "Osaka Manufacturing Excellence Award" in recognition of such achievements. The "Takumi" (Master Craftsmanship) logo is a testament to this honor.

You can view the list of our business partners through the link below.

Short lead times are possible with our ultra-large bending machine and flash butt welding.
By rolling irregularly shaped flat steel, we achieve maximum material yield.
Quality is stabilized, and we achieve high accuracy in flatness and roundness with our ultra-large expander press.

We manufacture over 10,000 tons of steel and stainless-steel rings annually.
From miniature washers to robust turret bases, as well as massive flanges with diameters of up to 4 meters,
Miharu is your trusted partner for all things ring-related!