Bolt accessories refer to the auxiliary components of the bolt, including pads, nuts and other components.

Bolt is deep into the rock and soil and control the rock and soil deformation of the slender rod body, one end and the engineering structure connection, the other end deep into the formation, the whole anchor is divided into free section and anchor section, free section refers to the bolt head tension transmission to the anchor solid area, its function is to apply prestress to the anchor, so that the bolt can play a certain supporting role when under load