This deep groove ball bearing carries radial and light axial loads in a single row of balls, with a bore diameter of 300.0 mm, outside diameter of 420.0 mm and width of 56.0 mm. Net mass is 24.8 kg. The bearing uses a solid brass cage (MA) and features standard bore tolerance Z. Limiting speed is rated at 2600 1/min, with a reference speed of 1890 1/min. Radial internal clearance corresponds to CN (Group N), the standard clearance range, suitable where no special mounting adjustment is required. The solid brass cage gives the design stability at the stated speed values and supports smooth ball guidance under sustained load. As this is an open bearing without an integrated seal, lubrication must be supplied and maintained externally, and mounting alignment should follow the specified bore tolerance class Z.