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Bolts: Mechanical parts, fasteners with screw threads with nuts. A type of fastener consisting of two parts of the head and screw (with a cylindrical body with an outer thread), which shall be matched with the nut for fastening the two parts with a pass hole. This type of connection is called Bolt connection. If the nut from the bolt spinning down, and can make the two parts separated, so the bolt connection is a detachable connection.
By the force of the connection: divided into ordinary and reaming holes. According to the head shape: have six angular head, round head, square head, sink head and so on. The hexagonal head is the most commonly used. The general sink head is used where the connection is required.
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