1, bolt: head and screw (with a screw thread) two parts of a fastener, need to cooperate with nuts, used to tighten the connection of two parts with holes. The connection form is called bolt connection. If the nut is screwed down from the bolt, the two parts can be separated, so the bolt connection belongs to the detachable connection
2. Screw: it is also a kind of fastener made up of two parts of head and screw. They can be divided into three kinds according to their usage - machine screw, fixed screw and special purpose screw. The machine is mainly used for a screw with internal thread hole parts connected with a fastening with a through hole parts, do not need to match the nut (this connection is called screw connection, is detachably connected; can also be used for fastening with a through hole between the two parts together with the nut. The fastening screw is mainly used to fix the relative position between the two parts. Special purpose screws have ring screws for lifting parts
Bolt and screw use place is different, the bolt on the accuracy requirements is not high, unless there is the requirement of cooperation, the general bolt disassembly convenience, processing precision is low, not limited by the coupling material, widely used, requiring the bolt, can bear the transverse load. Screws are compact in structure, but they can not be removed frequently and can not withstand large forces.
Structure: the bolt has a variety of styles "head"; "no stud head"; screws are also a variety of patterns of "head", but the "head" structure is different, screw the "head" of the general with a fastening groove and the inner six angle, tighten the screws by hand can be pattern roll in the "head". This makes the screw smaller in size. Application: bolts and nuts are generally used in pairs, used for through holes, easy to change after damage; studs are generally used with nuts; used for blind holes, and the connectors need to be often removed; screws are also used for blind holes, when the connectors are disassembled.
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