Used as a support for rotating components. The bearing has a radial guard that is produced in the form of a cylinder and from a special material and material and the bearing is also produced in different dimensions and is used in industry and is determined according to the location and method of bearing different bearings یاتاقان. In the industrial classification, they are divided into two categories (standard bearings) and (special bearings), the special cases of which include special industrial uses and railways.