This adapter sleeve provides a mounting interface between a shaft and a bearing with a tapered bore, allowing the bearing to be fitted onto a cylindrical shaft seat. Bore diameter is 35.0 mm and net mass is 0.182 kg, in standard design, complete with mechanical fixing (FP). The tapered outer surface of the sleeve creates an interference fit with the bearing bore when the locking nut is tightened, generating radial internal clearance reduction and secure axial positioning on the shaft. This design allows the bearing to be mounted at any point along a shaft without a shoulder or stepped seat, simplifying installation and dismounting while maintaining concentricity between shaft and bearing bore.