Carries radial loads in a slim single-row configuration with a steel sheet metal cage (JN) guiding the ball complement between raceways of 25.0 mm bore and 37.0 mm outside diameter, in a 7.0 mm width. Net mass is 22.0 g. The bearing reaches a limiting speed of 28000 1/min and a reference speed of 13900 1/min, reflecting the low-friction potential of the narrow 618 series cross-section. Radial internal clearance falls in the CN (Group N) range, suitable for standard fit conditions without added preload. The open design (bore type Z) leaves both sides accessible, so lubrication and sealing must be provided externally by the surrounding assembly. The thin-section geometry keeps radial and axial space requirements low while still supporting the specified speed ratings.