Deep groove ball bearing with a single row of balls, built in Generation C design with a steel sheet metal cage (JN) and a metal shield (Z) fitted to one side, leaving the opposite side open. Bore diameter is 55.0 mm, outside diameter 100.0 mm, width 21.0 mm, and net mass 0.575 kg. Limiting speed reaches 10400 1/min, reference speed 8300 1/min, and radial internal clearance is CN (normal, group N). The shield on one side keeps contamination out from that face while the open side permits relubrication or oil to pass through the bearing interior. Normal internal clearance CN matches standard shaft and housing tolerances without need for a special clearance selection, and the steel sheet metal cage maintains ball spacing and stability across the stated speed ratings.