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Our Company title

Corporate Summary

  1. Mission
  2. Description
  3. Corporate History



Grinding! Polishing! To continuously strive to create newer, better products borne from long-standing technology and dedication and to create an environment that both fully meets our customers' needs and satisfies ourselves.



NameNihon Grinding Wheel Co.Ltd.
Main Office 1-3-12, Honcho, Nakano-ku, Tokyo, 164-0012
TEL: 03-3372-8471    (+81)3-3372-8471
FAX: 03-3375-9115    (+81)3-3375-9115
Factory and Sales Office Factory Office
936, Hanyu-machi, Joso-shi, Ibaraki-ken, 300-2513
TEL: 0297-24-2182    (+81)297-24-2182
FAX: 0297-24-5041    (+81)297-24-5041

Our factory is located 20 minutes by car from the Yawara Interchange on the Jobando Highway. By JR train, take the Joso Line bound for Mitsukaido (transfer at Joban Line Toride station or Tsukuba Express line Moriya-station). Disembark at Mitsukaido Station, then take a 15-minute taxi ride to our factory. If you notify us in advance, we will gladly provide transportation from the Mitsukaido station.
PresidentShuji Mizoguchi
Board MembersDirectors: 3
Auditor: 1
Number of Employees23
IncorporatedMay, 1981
Established: January, 1921
Capital40 million yen (installment in full)
Areas of Business Manufacturing
  1. Manufacture and sale of PVA elastic grinding and polishing stones
  2. Manufacture and sale of resinoid grinding and polishing stones
  3. Manufacture and sale of vitrified grinding and polishing stones
  1. Magnetic Heads
  2. Gravure Rolls (copper cylinders for gravure printing)
  3. High-precision Finishes
  4. Diamond Dressers
  5. Filters
  6. Honing
  7. Soft-metal Polishing
  8. Non-metal Polishing
  9. General Grinding
  10. Rough Grinding
All business related to abovementioned items
Production Capacity200 tons/year
Factory Area14,500 square meters
Factory Building2,686 square meters
Bank Bank of Tokyo-Mitsubishi UFJ, Nakano Branch
Mizuho Bank, Shinjuku Nishiguchi Branch
Mitsui Sumitomo Bank, Shinjuku Nishiguchi Branch
Major Customers TDK Corporation- SAE MAGNETICS
Tokyo Diamond Tools Mfg. Co., Ltd.
Mitsui Grinding Wheel Co.,Ltd.
Nidec Sankyo Corporation
IHI Corporation
NSK Ltd.
Mitsumi Electric Co.Ltd.
Namiki Precision Jewel Co.Ltd.

(in no particular order)
Major Suppliers Fujimi Incorporated
Nanko Abrasives Industory Co., Ltd.
Sumitomo Bakelite Co.Ltd.
Mitsui Grinding Wheel Co.,Ltd.
Meiwa Plastic Industries,Ltd.
Shoei Shokai Co.,Ltd


3.Corporate History

The company began in 1918 in Nakano, Tokyo, as Sakurayama Kogyojo, a manufacturer of alundum, but in January, 1921, it became the Nihon Grinding Wheel Co.Ltd. In 1935, the company became a partnership firm, but all of the factory buildings were lost in an air raid in May, 1945. After the war, the Tokyo factory was rebuilt and production was partially re-started. In April, 1949, the company was incorporated, and in 1955, it was designated as a JIS factory. In February, 1971, in an effort to achieve further equipment rationalization, the factory was moved to Mitsukaido City (now Joso City) in Ibaraki Prefecture.
We have been manufacturing a variety of grinding stones for more than 90 years. We are proud of our products made using our unique technology and we have garnered positive reviews from our customers to date.