Screw

The utility model discloses a screw, including first core and screw pole, first core links to each other with the screw pole through separating the plectane, and the upper portion of first core is provided with disk -type is changeed the board, disk -type changes the board and passes through dish antithetical couplet seat fixed mounting on first core, the outside of first core sets up to hexagonalscrew thread shell, and the inboard of first core sets up to hexagonal screw thread inner shell relatively, the center department of hexagonal screw thread inner shell installs and prevents disconnected groove, prevent being provided with on the central perpendicular line in disconnected groove a word screw, the upper surface of separating the plectane passes through round platform seat dish andlinks to each other with first core, and the lower surface of separating the plectane has rubber backing ring with the continuous outside department cover of screw pole, the bottom of screw pole is provided with the screw thre