**Sealed vs Unsealed Bearing Comparison** When it comes to choosing between sealed and unsealed bearings, the 634ZZ bearings offer a clear advantage. The double-sided metal sealing not only protects the bearings from dust and debris but also prevents lubricant leakage, ensuring a longer lifespan...
bearing inner space (6), sealed by the seal ring and into an unsealed outside space (17). The recess includes a membrane (3) or membrane composite (8) that is provided with the membrane. The membrane is made of PTFE. The portion is formed as a rolling bearing inner space. The ...