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About Us

For more than half century KONISHI SEISAKUSHO CO., LTD. has been recognised as a leader in the manufacturing of precision ball bearings. Since 1934 our brand name MRK,continues to provide the world industry with high quality components.We are always endeavoring to modernize equipment, renew machines ,and introduce new technologies, and as a result have seen steady growth in production and the expansion of new markets.

Our pioneer spilit is represented in our motto "User's demands are the guide of progress" Thus we are able to provide precision engineered products to meet the needs of growing markets,such as electric machines and equipment manufacturing, automobile industry,industry of air compresser, and other areas of industry and agriculture.

This Home Page will introduce you to a selection of our products. We are ready to assist if you have questions, request, or would like to place an order.

Ryosuke Konishi

Company Outline

Name of the company


Head Office



President : Ryosuke Konishi


¥ 30,000,000

Authorized Capital

¥ 92,000,000


24th JUNE ,1957

Business Line

Thrust Bearings
Clutch Release Bearings
Belt Tensioner/Idler Bearings
air compressor parts
other areas of industry parts.



October, 1934

A private company,Konishi Iron Works Company established by Mr.Ichizo Konishi at No.2, Higashi, 2-cho, ichino-cho, Sakai-city, Osaka, and started the production of various radial & thrust ball bearing. (the company appointed as war plant later on)

June, 1956

The land(594㎡)purchased, the plant and the buildings (total677㎡)newly built. Also, Head Office moved to this plant.

June, 1957

The name of the company renamed to Konishi Seisakusho Co.,Ltd.
And the capital increased to \600,000.

February, 1957

The land(140㎡)purchased at No.19-3, Nishi-Kyukencho, Sakai-city, Osaka.

October, 1964

The capital increased to \ 2,000,000.

June, 1966

The capital increased to \ 6,000,000.

October, 1969

The capital increased to \ 13,500,000.

August, 1978

The land(2,100㎡)purchased at No.470, Nakamura-cho, Sakai-city, Osaka and a new plant(total 1,300㎡)built.

June, 1981

The capital increased to \ 23,000,000.

November, 1992

The capital increased to \ 30,000,000.
Head Office moved to the new plant and the same time, a lot of new and powerful machinery and equipment installed for further expansion.

December, 1997

The land(5.396㎡)purchased at 122, 2cho, Hamadera-Funao-cho, Higashi, Sakai-city, Osaka.
And a new plant(total6,792㎡)built.

August, 1998

The head office is moved to this place and it is operating now.

January, 2000

ISO9002 certified

January, 2003

ISO9001 certified

March, 2005

ISO14001 certified

November, 2005

We acquire an inbestment license in Vietnam.

October, 2006

We establish “KONISHI VIETNAM CO.,LTD”in Hanoi neighboring “Phnoi A Industrial Park” and establishment of a business.