6004ZZ (I.D.=20mm, O.D.=42mm, Thickness=12mm); 6004ZZ bearing are shielded on BOTH SIDES to keep lubricant in; Chromium Steel long-life bearings, smooth and low noise.
6004-2RS (I.D.=20mm, O.D.=42mm, Thickness=12mm); 6004-2RS bearing are shielded on BOTH SIDES to keep lubricant in; Chromium Steel long-life bearings, smooth and low noise.