Adapter sleeves are the most commonly used components for locating bearings with a tapered bore onto a cylindrical seat. Applied for fastening the tapered bearing to the shafts with support (“backrest”), where here the shaft should be threaded so that the nuts can push the sleeve against the bearing.They are sold independently and accessories (nut and washer) must be ordered separately.With the same dimensions of the standard sleeves, they are recommended for shafts or large assemblies, because channels of oil injection are provided, facilitating assembly and disassembly mainly.