- However, it's important to note that nitrile oil seals have limitations. They are not recommended for applications involving exposure to ozone, sunlight, or strong oxidizing agents. Also, their performance can be compromised in extreme temperature conditions, especially below -40°C or above 120°C. For these scenarios, alternative materials like fluoroelastomers or silicone may be more appropriate.
- One of the key advantages of thick rubber gaskets is their ease of installation and replacement. They can be easily cut to size or molded to fit specific dimensions, making them a cost-effective and efficient solution for a variety of sealing applications. Furthermore, rubber gaskets are relatively low maintenance and do not require regular re-tightening or adjustment, saving time and resources in the long run.
Name
Metal O.D. wall
(with a reinforcing inner metal case)




The cover is fixed by nuts or bolts on top, or by screws round the edge. Loosen them all and remove them with their washers. If there are several oil-sealing washers under each fixing, note their order.
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.
Thoroughly clean the sleeve at the back of the pulley, and look for any roughness on it where it touches the seal. If necessary, smooth it with fine wet-and-dry abrasive paper.