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"ZZ" means two metal shields; "2RS" means two rubber seals.

Use sealed (2RS) or shielded (ZZ) bearings to keep contaminants out. Wet/Corrosive: Opt for stainless steel or plastic bearings. buy ball bearings online

The bore size (Inner Diameter). For digits above 03, multiply by 5 to get the size in mm (e.g., "05" = 25mm). "ZZ" means two metal shields; "2RS" means two rubber seals

If the code is unreadable, use a vernier caliper to measure the Inner Diameter (ID) , Outer Diameter (OD) , and Width (W) in millimeters. 3. Choose Reputable Online Suppliers Bearing Selection Guide | How to Choose a Bearing "ZZ" means two metal shields