Deep groove ball bearing 63001-A-2RSR carries radial and moderate axial loads in a single row of balls running on a steel sheet metal cage of JN design. Bore diameter is 12.0 mm, outside diameter 28.0 mm, width 12.0 mm, and net mass is 0.031 kg. Both sides are fitted with seals, and the limiting speed reaches 15500 1/min. Radial internal clearance falls within the CN (Group N) range, giving a standard fit suitable where no special clearance adjustment is required. The integrated seals on both sides keep grease in and contaminants out, so the bearing runs sealed-for-life without additional relubrication under normal conditions. The steel sheet metal cage keeps the design lightweight while guiding the balls at the stated speed rating, and the compact 12 mm bore and width make it suited to installations with limited radial and axial space.