This linear ball bearing enables low-friction linear motion along a shaft through recirculating ball tracks. The unit KH20-PP is supplied with initial greasing and features seals on both sides, protecting the internal raceway from contamination while retaining lubricant inside the bearing. A relubrication facility is provided, allowing grease to be replenished during service without disassembly. Net mass of the unit is 32.65 g. The double-side sealing makes KH20-PP suitable for applications where the shaft is exposed to dust or particles in the surrounding environment, since the seals limit ingress while the bearing operates. The relubrication facility supports maintenance intervals where fresh grease can be added directly, extending the period between service actions without needing to remove the bearing from the shaft.