The internal expansion nut is a special threaded connector used to fix the pipe support/lift/bracket or equipment on the wall, floor or column.
The fixing principle of the internal expansion nut: The fixing of the expansion screw is to use the Angle to promote the expansion to produce friction gripping force to achieve the fixed effect. One end of the screw is a thread, and one end has a vertebral degree. The outer bread is a steel sheet, half of the tin cylinder has a number of cuts, put them together into the hole in the wall, and then lock the nut, the nut pulls the screw outward, pulls the vertebrae into the steel cylinder, the steel cylinder is opened, and is tightly fixed on the wall, generally used for guardrail, awning, air conditioning and other materials in cement, brick and other fastening. However, its fixing is not very reliable, if the load has a large vibration, it may loose, so it is not recommended for the installation of ceiling fans. The principle of the internal expansion nut is to hit the expansion bolt into the hole on the ground or the wall, tighten the nut on the expansion bolt with a wrench, the bolt goes out, and the metal sleeve on the outside does not move, so the big head under the bolt opens the metal sleeve, so that it fills the whole hole, at this time, the expansion bolt can not be pulled out.
