Full definition
Bearing without seals or shields permitting circulating oil or periodic grease relubrication. Designation has no suffix (e.g. 6205). Required in centralized oil lubrication systems, high-temperature applications (>120°C) or where lubricant flushing is needed. Marginally higher speed capability than sealed variants. ISO 15 standard. Brands: SKF, FAG, NSK, NTN, Timken.