Tooth-shaped self-locking screw sleeve

The utility model discloses a tooth-shaped self-locking screw sleeve which comprises a screw sleeve body. An external-thread part is arranged outside the screw sleeve body, an internal-thread part is arranged inside the screw sleeve body, a tooth-shaped part is arranged at one end of the external-thread part, a closing part is arranged at the other end of the external-thread part and located on the external-thread part, the tooth-shaped part and the external-thread part form an external structure of the screw sleeve, and a groove is formed in one end, close to the closing part, of the screw sleeve part. According to the tooth-shaped self-locking screw sleeve, due to the fact that a tooth-shaped structure is additionally arranged at one end outside a common self-locking screw sleeve, the screw sleeve can be matched with a base body and prevent the base body from rotating in the installation process, and besides, the screw sleeve is more stable in part installation performance and simple in structure, has installation locking torque, achieves a locating function, guarantees reliability of installation positions, avoids installation base body damage caused by rotation of the screw sleeve in the installation process, does not need a special installation tool, greatly improves installation efficiency, and can be widely popularized and applied in engine structural parts.