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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.