A anti -loose screw for gas pipeline flange joint

The utility model discloses an anti -loose screw for gas pipeline flange joint, including bolt, first nut, second nut and metallic gasket, the bolt is including thick portion and detail, be equipped with the right -handed thread in the thick portion, be equipped with left -handed screw in the detail, be equipped with the right -handed thread on the first nut, be equipped with left -handed screw onthe second nut, the aperture of first nut is greater than the aperture of second nut, first nut with thick portion cooperatees, the second nut with the detail cooperatees, it is fluted on the metallic gasket. Compared with the prior art, the utility model relates to an anti -loose screw for gas pipeline flange joint's beneficial effect does: integral production is simple, and is easy to assemble,can avoid taking place because of the gaseous vibrations in the gas pipeline cause the not hard up problem of nut to prevent the drop -in because of the not hard up gas leakage of nut. 本实用新型公开了种用于燃气管道法兰连接的防松螺丝，包括螺栓、第螺母、第二螺母及金