Bolt, machine parts, fasteners cylindrical nut matched with screw thread. Bolt: from the head and screw (cylinder with external thread) is composed of two parts of a class of fasteners, and a nut is used for fastening and connecting, two with a through hole parts. This form of connection that bolt connection. As the nut from the bolt rotation, and can make the two parts separately, so the bolt connection is detachable connection.
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