adapterlager

Adapterlager, or adapter bearing, is a bearing assembly that uses an adapter sleeve to adapt the bore of a standard bearing to a specific shaft diameter or to convert between inch and metric sizes. This allows mounting standard bearings on shafts that do not match the bearing bore directly, without machining the bearing itself.

Construction and variants: The core component is an adapter sleeve, which is a cylindrical insert pressed or slipped into the inner bore of the bearing. The sleeve can be solid or split (two-piece) to aid mounting. Its bore matches the shaft diameter, while the outer surface interfaces with the bearing’s inner race. Some designs include threading or features for a locking collar or set screws to fix the sleeve and bearing in place. Adapter sleeves are typically made from steel or hardened steel and are finished to resist wear.

Function and applications: Adapterlager enable flexibility and interchangeability in mechanical systems. They are used to fit conventional bearings to non-standard shafts, to convert metric to imperial dimensions, or to retrofit equipment without replacing the entire bearing. Common applications include machine tools, conveyors, pumps, gearboxes, and other drives where bearings must be mounted on various shaft sizes.

Installation and maintenance: The sleeve is installed by pressing into the bearing bore or onto the shaft, depending on the design, and the bearing is mounted on the sleeve and secured with locking screws or a locknut. Regular maintenance focuses on proper fit, lubrication, and avoiding excessive loads, which can cause wear or slippage between the sleeve and the bearing inner race.