NOK Corporation

Company Profile



1-12-15, Shibadaimon, Minato-ku, Tokyo 105-8585 Japan

Business Overview

-An independent manufacturer of oil seals.

-It operates in three business areas: the Seal Business, Electronic-parts Business, and Others.

‐It has a 70% share of the oil-seal market in Japan and a 50% share worldwide, according to the Company’s press release. It formed a partnership with Freudenberg in 1960, a major European oil-seal manufacturer based in Germany. This enabled the Company to create a worldwide supply chain that covers Japan, the Americas, Europe and Asia. In recent years, it has started developing products in response the trend in electrification and autonomous driving.


-From April 2022, moved to the Prime Market of the Tokyo Stock Exchange. (As of Mar. 31, 2023)
Name or Company Name Investment Ratio (%)
Freudenberg SA 25.11
The Master Trust Bank of Japan, Ltd. (Trust Account) 6.43
Custody Bank of Japan, Ltd.(Trust Account) 6.03
Showa Estate Co., Ltd. 5.07
Dai-ichi Life Insurance Company, Ltd. 4.62
Toyota Motor Corp. 3.93
Sumitomo Mitsui Banking Corporation 2.47
NOK employees stockholding 2.06
Total 61.25


-Oil seals
‐Soft metals
-Seal washers
-Mechanical seals
-Lip seals
-Static metallic gaskets
-Dust covers
-Industrial rubber products
-Phenolic resin molding materials
-Vibration isolator and sound isolating products
-High damping rubber (HDR)
-Solenoid valves
-Carbon bearings
-Compressor valves
-Special lubricants
-Flexible circuits
Products for Electric Vehicles
-Thermally conductive rubber
-Biomass material
-Anti-corrosive seal & grease for aluminum parts
-Oil seal for high-speed rotation motor shaft
-Low friction technology
-Surface textured mechanical seal for E-motor cooling system
-Crescent shape seal ring
-PTFE gas seal (high temperature & pressure seal)
-FPC for Automotive
-FPC for high-speed transmission
-Rubber electrode for biomedical signals
-Cushion rubber
-Space-saving gasket


Dec.1939 Established Edogawa Seiki in Katsushika, Tokyo.
Oct. 1948 Renamed as Tokyo Oil Seal Kogyo.
Dec. 1951 Merged with Nippon Yushi Kogyo, and changed Company name to Nippon Oil Seal Kogyo.
June 1954 Head office and plant moved to Ota, Tokyo.
Mar. 1960 Formed a business tie-up with the German company Freudenberg.
Aug. 1960 Built Fujisawa Works (Current Shonan Development Center) in Fujisawa, Kanagawa.
Sept. 1961 Listed on the Nagoya Stock Exchange.
Oct. 1961 Listed on the Tokyo Stock Exchange.
Oct.1961 Transferred headquarters to Chuo-ku, Tokyo.
June 1963 Established Saga Plant (currently Saga business facility) in Nakahara-cho, Saga Pref.
Oct. 1964 Established a subsidiary NIHON SEAL ALL Inc. (currently Eagle Industry Co., Ltd., an
affiliated company).
Jan. 1966 Head office moved to the current location.
Aug. 1967 Established Shizuoka Plant (currently Shizuoka business facility) in Makinohara-shi, Shizuoka Pref.
Apr. 1968 Established a subsidiary, NOK-USA., Inc., currently NOK Inc., in the United States.
April 1968 Established Fukushima Plant (currently Fukushima business facility) in Fukushima, Fukushima Pref.
April 1970 Established Kumamoto Plant (currently Kumamoto business facility) in Asa, Kumamoto.
Dec. 1974 Established Tokai Plant (currently Tokai business facility) in Kikukawa-shi Shizuoka Pref.
Dec. 1976 Established NOK Cluver, a subsidiary.
Dec. 1978 Established NOK Megrastic, a subsidiary.
Jan. 1982 Eagle Industry Co., Ltd., an affiliated company was listed on the Tokyo Stock Exchange.
July 1985 Changed name from Nippon Oil Seal Kogyo to NOK Corporation.
Aug. 1987 Established Nihonmatsushi business facility in Nihonmatushi, Fukushima Pref.
Oct. 1988 Established a subsidiary in Thailand, Thai N.O.K. Co., Ltd.
Mar. 1989 Established NOK EG&G Optelectronics (currently NEOPT Corp.), a subsidiary.
July 1989 Its U.S. subsidiary, NOK Inc., established Freudenberg NOK GP with the U.S. subsidiary of Freudenberg.
Aug. 1989 Established Tsukuba Technology Research Center in Tsukuba, Ibaraki Pref.
Jun. 1995 Established a subsidiary in China, Wuxi NOK-Freudenburg Co., Ltd.
July,1996 Established a subsidiary, NOK Asia Co., Pte. Ltd., in Singapore.
Mar,2000 Started negotiations with Freudenberg GmbH with regard to the O-ring business, focusing on marketing in response to global shared ordering.
Apr,2001 Invested 1 billion yen to establish a wholly-owned subsidiary and plant in Thailand to produce HDD components. Will shift production from Japanese plants and concentrate it in this new plant, which currently produces 30% of total sales. Projected increase to 40%.
July 2001 Concentrated the main oil seal business at Fukushima business facility. Transferred and integrated the Fujisawa business facility's machine tool oil seal R&D functions to the Fukushima facility.
Apr. 2002 Span off a subsidiary UNIMATEC from another subsidiary Nippon Mektron, Ltd.
Jan. 2004 Newly established its Tottori plant in Nambucho, Tottori Prefecture.
Mar. 2004 Acquired all the shares in Hokushin Corporation and made it its subsidiary.
Oct. 2004 Delisted from the Nagoya Stock Exchange.
Mar. 2005 Acquired all the shares in Nitto Kogyo Corporation and made it its subsidiary.
Apr. 2005 Established Shonan Development Center in Fujisawa City, Kanagawa Pref.
Apr. 2007 Consolidated its subsidiaries, Hokushin Corporation and Nitto Kogyo Corporation, renaming them as a new company, Synztec Co., Ltd.
Apr. 2010 Established Kitaibaraki plant in Ibaraki Pref., Japan.
Oct. 2013 Split off Synztec Co., Ltd. (a subsidiary), establishing Synztec Co., Ltd. as the split-off surviving company.
Dec. 2018 Newly established Tsukuba plant in Tsukuba, Ibaraki Pref., Japan.
Apr. 2022 Moved from the First Section of the Tokyo Stock Exchange to the Prime Market in line with TSE’s reorganization in April 2022.

Supplemental Information 1