Part Numbers and Designations
What is the difference between ZZ, 2RS, LLB, and LLU seals?
ZZ:The double metal shield provides moderate sealing against
solid contaminants.
2RS:The double rubber seal provides effective sealing against
both solid contaminants and liquids.
LLB:The double lip land riding contact seal provides moderate
sealing against contaminants.
LLU:The double lip contact seal with inner flinger provides
enhanced sealing effectiveness against contaminants and harsh environments.
These designations indicate different types of
seals used in bearings, with varying levels of sealing effectiveness. ZZ and LLB seals provide
moderate sealing against solid contaminants, while 2RS and LLU seals offer more effective
sealing against both solid contaminants and liquids. LLU seals also have an inner flinger that
enhances sealing in harsh environments. The choice of seal type depends on the specific
application and environmental conditions.
