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.


Among the most common causes of oil seal failure are:
However, it’s plagued with a few drawbacks, such as poor resistance to ozone, sunlight, and weather. It also has limited resistance to high temperatures and flames.
Wheel hub oil seals are essential components in automotive systems, serving to maintain the integrity of the wheel hub assembly. These seals are designed to prevent the leakage of lubricating oil and the entry of contaminants, safeguarding the wheel bearings and other internal components. By creating a barrier against moisture, dirt, and debris, wheel hub oil seals contribute to the smooth operation and longevity of the wheel assembly, ensuring optimal performance and safety on the road.
One of the key benefits of using a square rubber gasket is its flexibility and compressibility, allowing it to conform to irregular surfaces and provide a secure seal. This flexibility also makes it easy to install and remove, making maintenance and repairs more efficient.
No matter the PTFE machining techniques and other processes used in making mechanical parts, they tend to fail due to some reasons. The same thing applies to oil seals. When they are exposed to some factors, they fail. The factors are stated below alongside the solutions.
In addition to these standardised types, the following special types are also available:
A: with minor lip