Drop in Expansion Anchor Bolts

The expansion screw consists of a screw and an expansion Guandeng part. The tail of the screw is conical. The large diameter of the cone is larger than the inner diameter of the expansion tube. When the nut is tightened, the screw moves outward and moves the cone part through the axial direction of the thread. Move, In addition, a large positive pressure is formed on the outer side of the expansion pipe, and the angle of the cone is very small, so that the friction and self-locking between the wall and the expanding Guanji can be formed, and the fixed effect can be achieved.