This linear ball bearing carries balls in a recirculating arrangement inside an outer sleeve, allowing continuous linear motion along a shaft rather than rotation only. It is sealed on both sides and supplied with initial greasing, with a net mass of 20.355 g. The design includes a relubrication facility, so grease can be replenished during service without dismantling the unit. The double-side sealing keeps the ball tracks protected from dirt and moisture ingress while retaining the initial grease fill inside the bearing. Because relubrication is possible through the built-in facility, the bearing suits applications where periodic maintenance is preferred over full replacement. Its construction is intended for linear guiding tasks requiring smooth axial travel with contamination protection at both ends.