Expansion bolt

The utility model provides an expansion bolt, it includes expand tube, bolt, nut and packing ring, expand tube, packing ring and nut are followed in proper order the last pot head of bolt is located the outside of bolt, the expand tube includes open bulge of atress and hollow cylindrical connecting portion, connecting portion with bulge fixed connection, connecting portion cup joint the outside ofbolt, connecting portion are equipped with the internal thread, be equipped with on the bolt with internal thread assorted external screw thread, connecting portion with bolt threaded connection, just be equipped with first bump a plurality of and the wall body fastening on the outer wall of bulge. The utility model discloses an expansion bolt mainly can dismantle with the bolt through the internal thread that is equipped with in the expand tube and be connected, can directly revolve nut, gasket and bolt in proper order to twist to remove and recycle material saving, moreover this expansion bolt still is equipped wit