Bolt

Bolts: mechanical parts, with nuts cylindrical fasteners with threads. A class of fasteners consisting of two parts: the head and the screw (cylinder with external thread), which need to be fitted with a nut for fastening the connection of two parts with through holes. This form of connection is called bolt connection. If the nut is screwed off the bolt, and the two parts can be separated, so the bolt connection is a removable connection.