Bolts, cylindrical threaded fasteners with nuts

Bolts: mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (cylinder with external thread), which needs to be matched with a nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

As a holistic engineering structure, the track is laid on the roadbed, which plays a guiding role in the operation of the train, and directly bears the huge pressure of rolling stock and its load. Under the power of train operation, its various components must have sufficient strength and stability to ensure that the train runs safely, smoothly and uninterrupted at the specified maximum speed.