Adapter sleeves are the most commonly used components for locating bearings with a tapered bore onto a cylindrical seat as they can be used on plain shafts or stepped shafts. They require no additional shaft position and are simple to install. When applied to plain shafts, the bearing can be positioned anywhere along the shaft. Bearing mounting and dismounting are made easier when the bearing is precisely positioned axially on stepped shafts in conjunction with an L-shaped spacer ring.