- The dimensions 40x52x7 denote the outer diameter, inner diameter, and thickness of the oil seal respectively. The first number, 40, refers to the outer diameter, which is the measurement from one side of the seal to the other when it's placed on the outer surface of the component it seals. The middle number, 52, signifies the inner diameter, the size of the shaft or housing bore it fits around. Lastly, the 7mm thickness contributes to the seal's durability and ability to withstand pressure.
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.Notes
* JIS: Japanese Industrial Standard
✓: Compatible
✗: Incompatible
―: Not applicable
Failure to install oil seals correctly can lead to failure. Factors such as knocking the seal into place may cause its spring to tilt in the bore or be out of alignment. Consider switching to a solid adhesive and applying it around the surface of the spring to prevent it from loosening.
One way to identify a seal that has not been fitted correctly is to check the rough shear of the rubber. To resolve this issue, align the mounting tool before positioning the seal in place.