This adapter sleeve provides a mechanical fit between a shaft of 30.0 mm nominal diameter and a bearing with a tapered bore, allowing the bearing to be mounted on a plain cylindrical shaft seat. The sleeve is of standard design, complete and ready for mechanical fitting, with a net mass of 152.67 g. Using an adapter sleeve simplifies mounting and dismounting compared to a directly tapered shaft, since the bearing can be positioned axially along the sleeve before locking. This design suits applications where a bearing with a tapered bore needs to be installed on a straight shaft section, giving a secure interference fit once tightened to the correct position.