Generally the fasteners include the following parts：
what is a fastener---Bolt: a type of fastener, consisting of two parts of the head and the screw (with an external screw cylinder), is required to fit the nut, and the two parts are connected with the hole. This type of connection is called bolt connection. If the nut is screwed on the bolt, the two parts can be separated, so the bolt connection is a detachable connection.
what is a fastener---Stud: it has no head, it is a kind of fastener only at both ends with outer thread. One end of the connection must be screwed into a part with the inner screw hole, the other end is threaded through the bore of the hole, and then screw on the nut, even if the two parts are fastened to a saw. This connection form is called a stud connection, which is also a detachable connection. Mainly used to be connected parts of one of the larger thickness, the requirements of the structure is compact, or due to the frequent removal of the occasion, not the use of bolt connection.
what is a fastener---Screws: a type of fastener that is made up of two parts of the head and screw. The screw can be divided into three categories: machine screws, screws and special purpose screws. The machine screw is mainly used for a screw hole of a screw hole, and a fastening connection between a spare part of the hole is not required to be connected with the nut. The screw is mainly used for fixing the relative position between the two parts. Special purpose screws such as screw ring for hoisting parts.
what is a fastener---Nut: it with an internal thread hole, its shape were generally significantly flat hexagonal prism shaped and a flat square column shape or a flat cylindrical, with its bolts, studs, or machine screws, is used for fastening and connecting two parts, to become a whole.
what is a fastener---Self tapping screws: it is similar with the screw thread on the screw machine, but for the special self tapping screws thread. For fastening the two thin metal elements, making it into a whole, the need to make a hole in advance, because this screw has a high hardness, can be directly screw into the hole, so that the formation of the response of the internal thread. This type of connection is also a detachable connection.