This linear ball bearing enables straight-line motion along a shaft, carrying rolling elements that recirculate within the unit to permit continuous linear travel. It is sealed on both sides, which keeps grease inside the bearing and prevents contaminants from entering the rolling elements. The bearing comes with initial greasing and includes a relubrication facility, so grease can be replenished without dismantling the unit. Net mass is 0.19 kg. The double-side sealing combined with the relubrication facility makes this bearing suitable where extended service intervals are required, since fresh grease can be added directly through the provided opening rather than requiring a full strip-down. The initial factory greasing means the bearing is ready to run on installation, and the sealed construction maintains consistent lubrication conditions along the shaft during linear travel.