Expansion bolts consist of countersunk head bolts, expansion tubes, flat washers, spring washers, and hexagon nuts. Expansion bolts are special threaded connectors used for fixing pipe supports/hangers/brackets or equipment to walls, floors, or columns.

When using, must first use the impact drill in the fixed body drilled the corresponding size of the hole, and then the bolt, the expansion tube into the hole, tighten the nut can make the bolt, the expansion tube, the mounting parts, and the fixed body between the expansion of the body as a whole. After tightening, the bolt will be expanded, there is a big head at the end of the bolt, the bolt outside the set of a slightly larger than the diameter of the bolt round tube, the end of that part of a few openings, when the bolt is tightened, the end of the big head is brought to the openings of the tube inside the tube, the tube is enlarged, to achieve the purpose of expansion, and then fix the bolt to the ground or wall, to achieve the purpose of rooting.