
hard rubber gasket. They can be compressed between two surfaces without losing their sealing properties, ensuring a leak-free connection. This feature is crucial in applications where a consistent and reliable seal is critical for the proper functioning of equipment.
The basic principle of an oil seal is fairly straightforward. It is installed adjacent to the bearing, with the flexible lip against the rotating shaft and the casing pressed into the housing to hold the seal in place. It’s important that the sealing lip is lubricated to prevent it from overheating as a result of any generated friction. It’s also crucial to understand which type of seal is appropriate for your particular machinery. Before selecting your seal, consider the environment, temperature, pressure and shaft speed of your machine, as well as the type of medium the seal will come into contact with during operation. These considerations will all determine the size, colour, and type of lip material or sealing element to choose, and whether it can be sealed in or sealed out.
Nitrile (NBR) Oil Seals
Compared with nitrile rubber, superior in resistance to heat and abrasion
Seals are classified by O.D. wall material, lip type, and whether they have a spring or not.
Major oil seals are specified in ISO 6194-1 and JIS B 2402-1.
Table 2 shows the common types of oil seals, while Table 3 shows the features of each type of oil seal.
Table 4 lists the JTEKT oil seal type codes and corresponding ISO and JIS standards.
Fluoro rubber (FKM)

spark plug 794 055a. A properly functioning spark plug ensures that the air-fuel mixture is burned efficiently, maximizing the power output of the engine. This leads to better fuel economy and lower emissions, contributing to a cleaner and more environmentally friendly driving experience.
insufficient lubrication
Figure 2: Typically shaped oil seal and component nomenclature
For more detailed information, please see the following:
Names and functions of seal components
If the drive gear has slanting teeth, they may cause the rotor arm to turn. If it does, mark its new position to aid refitting