NOK began producing oil seals， 0-rings, and rubber packings in the 1940s. Since then, we have been constantly leading the industry with new technologies by taking the following steps: considering a lubricant mechanism; understanding the sealing phenomenon; presuming a sealing mechanism; implementing robust design; and building visualization technologies.

In materials technology, we are mixing materials， developing adhesives, and making physical and chemical analyses independently while always fostering technological development in cooperation with customers in a forward-looking manner.

NOK CORPORATION (NOK) 's history of oil seals virtually represents Japan's history of oil seals. When the company was established, oil seals were generally made of leather. The oil seals of that time were therefore not stable in terms of sealing performance, and the smell of oil leaking from engines was notice- able in automobile garages. To solve this problem， NOK began producing rubber oil seals and launched a production line for the seals at its then head office factory in Haneda in 1954. At the same time, we also began conducting independent research into oil seals and announced a lubricant principle regarding the friction and sealing of oil seals in 1959. Through these efforts， we built the foundation for NOK as it is today.

NOK, in its long history of technological development, has been persistently presuming and verifying various phenomena. NOK's visualization technology, which represents one of its core technologies,is used to check the status of an oil membrane that is created when an oil seal is used on a rotating Shaft. NOK succeeded in visualizing the oil flow for the first time in the world and has dramatically improved the accuracy of verifying differences between theory and reality. With this technology, the behaviors of parts inside metal cells can be visualized. And the behaviors and vibrations of materials in metal molds are also analyzable. NOK is also endeavoring to develop unique technologies and evaluation equipment's introduce more advanced technologies, improve the reliability of its product functions, and supply even safer products.