Stop nut

The utility model discloses a stop nut, including the cylindricality bolt, the last fixed surface of cylindricality bolt installs the connection stripe, the outer fixed surface of cylindricality bolt installs the pentagon nut, the outer fixed surface of pentagon nut installs the packing layer, and has an annular iron plate at the lower extreme fixed mounting of pentagon nut, annular iron plate's lower extreme still fixed mounting has lock nut, lock nut fixed mounting is at hydraulic nut's internal surface, hydraulic nut's upper surface still fixed mounting have a piston, the upper surface of piston still fixed mounting has a nut cylinder body, and the right -hand member of nut cylinder body still fixed mounting have hydraulic pressure gas pocket layer, strengthened the fastening nature of whole nut for the use of double -screw bolt is favorable to consolidating the work piece more, and whole device simple structure, and the practicality is strong. 本实用新型公开了种防松螺母，包括柱形螺栓，所述柱形螺栓的上表面固定安装有连接条纹，所述柱形螺栓的外表面固定安装有五角形螺母，