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Commitment to Quality

Basic Philosophy

Contribute to the world at large by providing a stable supply of products of superior quality

Quality Policy

  1. Plan to realize products responding to customer needs and expectations, and stably provide them

  2. Comply with relevant laws, regulations, and applicable requirements.

  3. Quality targets will be set to achieve these goals, and all employees will work together to achieve them.

  4. Continuously improve the quality management system.

    Quality Management System (QMS)
    The Asahi Diamond Group has established a QMS (Quality Management System) at all of its domestic plants, as well as at its overseas subsidiaries, Asahi Diamond Europe, Asahi Diamond Indonesia, Taiwan Asahi Diamond Industrial, Shanghai Asahi Diamond Industrial, and New Ltd. have established QMS (Quality Management System) and obtained ISO9001 certification.

ISO9001 certification acquisition

Chiba tsurumai plant obtained  ISO9002:1994 certifivation from JQA.
May 1995

Chiba Tsurumai Plant obtained
ISO9002:1994 certification from JQA.

December 1995

Mie Plant and Tamagawa Plant acquired
ISO9002:1994 certification from JCQA.

June 1997


ISO9002:1994 certified by JCQA at Yamanashi Asahi Diamond

January 2003

Mie Plant, Tamagawa Plant, and Chiba Tsurumai Plant integrated
Transition to ISO9001:2000 version Registration No. JCQA-0096

January 2004

Integration of Yamanashi Asahi Dia.

November 2009

Transition to ISO9001:2008

December 2016

Transitioned to ISO 9001:2015 and integrated Koremura Co.

Our group has built a production system with six bases in Japan to provide high-quality products.
Domestic and overseas production bases cooperate proactively to exchange human resources and technology to secure high quality for all products.
While customers' requirements have grown tougher year by year, we have retained the attitude of providing products exceeding customers' expectations with our production capabilities backed by advanced technology and unshakable production setup we have nurtured over a long time.
In the future, all production bases will be united to provide comprehensive services.

As diamond tools are used for manufacturing, particularly to process expensive industrial materials, in a wide range of industries, it is very important to stabilize their quality and supply.
We must develop arrangements to realize stable production and guarantee the quality of products, while exploring potential improvements.

Thorough efforts to stabilize supply

Every process is required to secure a stable supply.
Backing up our products' high quality is a system to secure a stable supply in all purchasing, production, inspection, and delivery processes.
For purchasing materials, we have developed a system to procure strictly selected materials for guaranteeing a stable supply via reliable routes.
WAs for manufacturing systems, we record dates for routine maintenance checkups. Furthermore, we secure thorough management at each manufacturing front to maintain high accuracy.

Thorough efforts to stabilize supply

Seeking to exceed customers' expectations with valuable products

About 90% of our products are produced on order from customers.
Since producing the most valuable products for customers is the most important, we see our production processes as covering our delivery of products to customers to gain customer satisfaction.
We ship products meeting customers' different requirements in their respective best states and send engineers to customers as necessary to hear their requests.
We believe that this practice can add value to our products.

Seeking to exceed customers' expectations with valuable products

If you have any questions or concerns, please feel free to contact us at