Metal self-sealing screwed joint structure of expansion sleeve

The utility model discloses an expansion sleeve metal self-sealing screwed joint structure which comprises an internal thread end and an external thread end, and the internal thread end is sequentially provided with an internal thread end face, a first secondary sealing face, an internal thread, a main sealing face, an anti-torque shoulder, a boring cylindrical face and a boring conical face fromoutside to inside in the axis direction. The external thread end is sequentially provided with a position control table shoulder, a second secondary sealing face, an external thread, a main sealing arc face, an auxiliary sealing conical face, an anti-torque end face, an inner flat cylindrical face and an inner flat conical face from inside to outside in the axis direction. After the internal thread end and the external thread end are in threaded connection, the main sealing surface is in metal interference contact with the main sealing arc surface and the auxiliary sealing conical surface, thefirst secondary sealing s