J: Additional code is added here as an identifier when two or more seals have exactly the same type codes and dimensional numbers.
How to Choose the Right Oil Seal
4. Example of the applications of seals
Oil seals are one of the major contact type sealing devices.
• They prevent leakage of the lubricant or other sealed substance, and
• prevent entry of dust and foreign matter (dirt, water, metal powder, etc.) from outside.