The ball bushing is a mobile element that runs on a shaft. It may be made up of a solid, cast sheet metal or segmental cartridge. The latter allows for slight misalignment between the shaft and the mobile component, as well as between pairs of parallel shafts, still guaranteeing the nominal carrying capacity of the ball-raceway contact. The cartridge contains a cage, in which the balls are distributed and recirculated under the load. Versions with or without dust and internal oil seals are available. Some versions also have holes for periodic lubrication.
The stiffness of the shaft-sleeve system is usually medium to medium-high and is able to withstand loads of medium entity, with medium precision ratings. There are versions made of anti-corrosion material or lined, for applications in the food processing, pharmaceutical, chemical and cosmetic industries. The sleeves may be supplied complete with supports in light alloy (closed, open or adjustable) ready for mounting.