Capping nut

The utility model discloses a sealing cover nut, and aims to provide a sealing cover nut which is convenient to integrally machine and form. Comprising a top cover and a main body, the top cover and the main body are integrally formed, a plurality of first forming grooves are formed in the top cover, the top cover comprises a protruding part and a step part, the step part is matched with the main body, the main body is in a cylinder shape, a first blind hole is formed in the main body, and threads are arranged in the first blind hole. The protruding part is in the shape of a circular truncated cone, and a plurality of first forming grooves are formed in the protruding part. The first forming groove is an annular groove, and the first forming groove is formed in the top cover in the circumferential direction. The main body is in a hexagonal prism shape, a plurality of first chamfers are arranged on the surface of one end, close to the step portion, of the main body, a plurality of second chamfers are arranged