This deep groove ball bearing carries a thin-section design with a 40.0 mm bore, 52.0 mm outside diameter and 7.0 mm width, giving a net mass of 0.032 kg. It is a single row construction fitted with metal shields on both sides and a steel sheet metal cage (JN). Radial internal clearance falls within the CN (Group N) range. Limiting speed is rated at 16200 1/min, with a reference speed of 8400 1/min. The shielded design protects the raceway and balls from dust ingress while retaining grease within the bearing, so it suits applications where re-lubrication access is limited. Standard CN clearance combined with the steel sheet metal cage supports smooth operation at the stated speed range without added axial guidance features. The thin cross-section (7.0 mm width relative to a 40.0 mm bore) makes it suitable for compact housing designs where radial space is restricted. Dimensionally and constructionally equivalent references include SKF 61808-2Z, NSK 61808ZZ and NTN 61808ZZ.