Standard parts
it usually includes the following 12 categories of parts: 1
. Bolts: the head and screw (with the external thread of the cylinder) composed of two parts of a class of fasteners, to be in conjunction with the nut for fastening to connect the two with a through-hole parts. This connection forms of said bolts. If the nut unscrewed from the bolt, you can make these two parts separately, it is bolted connections are detachable connection.
2. Stud: no head, only both ends takeaway thread fasteners. Connection, one end must be screwed with the internal thread hole parts, through the other end with a through-hole parts, and then screw on the nut, even if the fastening of the two parts connected into one overall. This form of connection known as stud connection, is also a detachable connection. Mainly used in Part one of the thickness of the connection, requiring a compact, or due to frequent demolition should not be bolted occasions.
3. Screws: a class is also composed of two parts of the head and the screw fasteners, by end-use can be divided into three categories: machine screws, set screws, and special purpose screw. Machine screws used for the main parts of a tight set of threaded holes, fastening connection with a through-hole parts, no nut with (this form of connection is called the screw connection, are also removable connection; can also be in conjunction with the nut used to tighten the connection between the two parts with a through-hole.) set screws mainly used for the relative position between the fixed two parts. Special purpose screws, such as rings screw for lifting parts with. The
4. Nut: with threaded holes, the general shape was as flat hexagonal column, there Chengbian square cylindrical or flat cylindrical, with the bolts, studs or machine screws for fastening connecting the two parts, making it an overall.
5 self-tapping screws: machine screws, but the screw threads on the special self-tapping screws with thread. Used to tighten the connection of two thin metal structures into an overall need to advance the system components on a small hole because of this screw has a high hardness can be directly screwed into the hole in the component, so that the components the formation of the response of the internal thread. The form of this connection is also a detachable connection.
6 wood screws: and machine screw, similar to, but the threads on the screw rib, dedicated wood screws can be directly screwed into the wood component (or components) for a band-pass hole metal ( or non-metallic) parts and the components of a wooden fastening together. This connection is also a detachable connection.
7. Washer: the shape of a class of oblate ring fastener. Placed between the bearing surface of bolts, screws or nuts and connecting parts of the surface plays an increasing other elastic washer is connected parts contact with the surface area world pie network information , reducing the pressure per unit area and protection is to connect parts of the surface is not damaged; also plays to stop the pine nut back.
8. Retaining ring: for installed machinery, equipment, shaft groove or slot hole, and plays to stop moving around the parts on the shaft or hole.
9. Sales: for parts positioning world pie network information , and some are also available for parts to connect fixed parts, transmission of power or lock the use of other fasteners.
10. Rivets: composed of two parts by the head and shank-type fasteners for fastening to connect the two with through-hole parts (or components), making an overall This form of connection known as the rivet connection, referred to as riveting. The case is not removable connection. Separate the two parts together to make the connection, you must destroy the parts of rivets.
11. Assembly and connecting: assembly refers to the combined supply of a class of fasteners, such as a machine screws (or bolts, Self-screw) and flat washers (or spring washers, lock washers) combination of supply ; Vice connection refers to some kind of special bolts, nut and washer combination of the supply of a class of fasteners, such as the steel of high strength large hexagon head bolts connecting.
12. Stud welding: light and nail head (with or without nailhead) constitute a heterogeneous fasteners, welding methods he fixed connected to a parts (or components) above, in order to connect with other parts.
standard, the market is also known as fasteners. Is a kind of mechanical parts for fastening connection with the wide range of applications. Fasteners Features :: varieties many specifications, the performance of different purposes, and a high degree of standardization, serialization, universal. Therefore, have a national (industry) standard fasteners as standard fasteners, referred to as the standard.
Due to the specific requirements of each specific fastener product specifications, dimensions, tolerances, weight, performance, surface conditions, labeling methods, and acceptance inspection, marking and packaging are provisions in several countries (industry) standards, such as English, German-made and the U.S. system.
Fasteners is the most widely used mechanical basic parts. With China's accession to the WTO in 2001 and entered the ranks of the international trading power. Our fastener products are exported to the world, the world's fastener products continue to flood the Chinese market. Fasteners as China's import and export a large amount of one of the products, with international standards, the promotion of China's fastener business to the world to promote the fastener enterprises to participate fully in international cooperation and competition, all with an important show and strategic significance.
Fastener is two or more parts (or components) to tighten the connection to be one of a kind of mechanical parts used in the overall general market, also known as the standard.