This linear ball bearing enables low-friction linear motion along a shaft, using recirculating ball tracks machined into the bearing body. Bore diameter is 25.0 mm and outside diameter is 40.0 mm, with a net mass of 157.74 g. The bearing is sealed on all sides, protecting the ball tracks from contamination during operation. The design includes a relubrication facility, allowing grease to be replenished without dismantling the unit from the shaft. Sealing on all sides supports use in environments where dust or particles could otherwise enter the ball tracks, while the machined construction gives a defined running clearance suited for precise linear guidance. A corrosion-resistant version of this design is available.