Self-locking spiral thread fastener for preventing bolt and nut from being stuck

The utility model discloses a self-locking spiral thread fastener for preventing a bolt and a nut from being stuck, which comprises a fastener main body, a self-locking rod is arranged in the center of the inside of the fastener main body, a spiral thread layer is arranged on the outer ring of the fastener main body, and the self-locking rod is connected with the spiral thread layer. Notches are formed in the two sides of the one-third position of the upper portion in the spiral thread layer, upper locking openings are formed in the positions, located in the middles of the notches, of the outer wall of the fastener body, two-tooth locking claws are arranged at the positions, located in the upper locking openings, of the outer ring of the self-locking rod, and the number of the two-tooth locking claws is not less than three sets. The notch is formed in the one-third spiral line thread layer of the upper portion, a certain space can be reserved in the spiral line thread layer through the notch, when the nut is