Chemical bolt shaped anchor bolt expansion anchor bolt

Expansion bolt is a special threaded connector used to fix the pipe support/hanging/bracket or equipment on the wall, floor and column.  The grades of carbon steel bolts are divided into more than 10 grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc.  

The fixing principle of expansion screw: the fixing of expansion screw is to use the sharp slope to promote the expansion to produce friction gripping force, so as to achieve the fixing effect.  A screw has a thread at one end and a degree at the other.  Coated steel sheet, iron sheet drum half number of incision, put them together into a good hole in the wall, then lock nut and the screw nut to pull, pull vertebral degrees into the steel cylinder and steel cylinder is rolling out, then firmly fixed on the wall, commonly used in fence, rain loose, air conditioning and other fastening on material such as cement, brick.  However, its fixation is not very reliable. If the load has a large vibration, it may loose, so it is not recommended for installing ceiling fans.  The principle of an expansion bolt is that after the expansion bolt is hit into a hole on the ground or wall, tighten the nut on the expansion bolt with a wrench. The bolt moves outward, but the metal sleeve does not move. Therefore, the big head under the bolt expands the metal sleeve to fill the whole hole.