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Stud 、spiral 、bolts and screw different details?

Update:23 Oct 2017
Summary:

    Screws, in fact, screws are known, and screws, scre […]

    Screws, in fact, screws are known, and screws, screw rods are different from each other. Screw is generally called wood screws; is the tip of the kind of tip, pitch larger, generally used to tighten wood parts, plastic parts. Screw is a screw (mechanical screw), is the kind of front-end flat head, pitch is small, uniform, generally used to fasten the metal, machine parts.
    A type of fastener with no head, only the ends of which are threaded. When connected, it must be screwed into the part with internal screw hole, the other end through the through hole with the parts, and then screw the nut, so that the two parts fastened into a whole. This type of connection is called a stud connection and is a detachable connection. Mainly used for one of the connected parts of a larger thickness, requiring a compact structure, or because of frequent demolition, should not be bolted to the occasion.
   Spiral (spelling: luógǎn, English: spiral): the outer surface of the spiral groove of the cylinder or cut cone with a spiral groove cone. The screw has a different head, like the picture called the hexagonal screw. There are other, such as large flat screws, hexagon screws and so on.
   Bolts: Mechanical parts, threaded threaded fasteners with nuts. A type of fastener consisting of a head and a screw (with an external thread) is required to fit the nut for fastening the connection of two parts with through holes. This type of connection is bolted. If the nut is unscrewed from the bolt and the two parts can be separated, the bolt connection is a detachable connection.

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