Carbon Steel Flat Washer

　　Fasteners, also known as "meters of industry", are widely used mechanical parts for fastening and connection. During the past "13th five year plan" period, the fastener industry conscientiously implemented innovation, coordination, green, sharing and openness

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Fastener is the general name of a kind of mechanical parts used to fasten and connect two or more parts (or components) into a whole. Also known as standard parts on the market. It usually includes the following 12 types of parts: 1 Bolt: a kind of fastener composed of head and screw (cylinder with external thread), which needs to be matched with nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a removable connection. 2. Stud: it is a kind of fastener without head and with external threads on both ends. When connecting, one end of it must be screwed into the part with internal thread hole, and the other end must pass through the part with through hole, and then screw on the nut, even if the two parts are firmly connected as a whole. This connection form is called stud connection, which is also a detachable connection. It is mainly used when one of the connected parts is thick, requires compact structure, or is not suitable for bolt connection due to frequent disassembly. 3. Screw: it is also a kind of fastener composed of head and screw. It can be divided into three categories according to purpose: machine screw, set screw and special purpose screw. Machine screws are mainly used for the fastening connection between a part with a fixed threaded hole and a part with a through hole, without nut matching (this connection form is called screw connection, which also belongs to removable connection; it can also be matched with nuts, which is used for the fastening connection between two parts with a through hole.) The set screw is mainly used to fix the relative position between two parts. Special purpose screws, such as eyebolt, are used for hoisting parts. 4. Nut: with internal thread hole, the shape is generally flat hexagonal column, or flat square column or flat cylindrical. It is used to fasten and connect two parts into a whole with bolts, studs or machine