Fastening sleeve convenient to lock

The utility model discloses an adapter sleeve convenient to lock, and particularly relates to the technical field of adapter sleeves, the adapter sleeve comprises a lock ring, a neck bush and a lock plate, the outside of the neck bush is sleeved with the lock plate and the lock ring, the outer surface of the neck bush is provided with external threads, the inner surface of the lock ring is provided with internal threads, the lock ring and the neck bush are in spiral connection, and the lock ring and the neck bush are in spiral connection. A strip-shaped through hole is formed in the outer wall of the neck bush, the opening position of one end of the neck bush is fixedly connected with a guide ring B, and the opening position of the other end of the neck bush is fixedly connected with a guide ring A; the bearing has the beneficial effects that when the neck bush is inserted into the bearing, the guide ring B of the neck bush has an auxiliary guide effect, so that the neck bush is convenient to insert; when the