Fastener is a kind of mechanical parts for fastening connection with the wide range of applications. Fastener characteristics: many different specifications, the performance of different purposes, and standardization, high degree of series, 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, were provisions in several countries (industry) standard, For example, English, German-made and the U.S. system.
Fasteners is the most widely used mechanical basic parts. With the country'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.
The fasteners are two or more parts (or components) to tighten the connection to become a general term to see a kind of mechanical parts used in the overall. The market is also known as standard parts.
It usually includes the following 12 categories of parts:
Bolt: the head and the screw (with the external thread of the cylinder) composed of two parts of a class of fasteners required 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.
Stud: no head, only on both ends of the thread take-out 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.
Screws: fasteners by the head and screw the two parts of a class, 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.
4 nuts: with threaded holes, the general shape was as flat hexagonal cylindrical, and there are Chengbian square cylindrical or flat cylindrical, with the bolts, studs or machine screws for fastening connecting the two parts, so that become one as a whole.
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: is similar to the machine screws, but the threads on the screw rib, dedicated wood screws can be directly screwed into the wood component (or components) for a metal with a through-hole (or non-metallic ) parts with a wooden components fastening together. This connection is also a detachable connection.
Washer: The shape of an oval ring type fasteners. 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, 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.
Retaining ring: for the installed machinery, equipment, shaft groove or slot hole, and plays to stop moving around the parts on the shaft or hole.
Marketing: for parts positioning, and some are also available for parts to connect the fixed parts, transmission of power or lock the use of other fasteners.
10 Rivet: composed of two parts by the head and shank-type fasteners for fastening to connect the two with a 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 a combination of supply of fasteners, such as a machine screws (or bolts, Self-screw) and flat washers (or spring washers, lock washers) combination of supply; connections made refers to some sort of special bolts, nuts and washers combination of supply of a class of fasteners, such as steel connections made with high strength large hexagon head bolts.
12 stud welding: the light energy and the nailhead (or no nail head) constitute heterogeneous fasteners, welding methods he fixed connection in a parts (or components) above, so that the other parts connect.
Each fastener products must involve some of the standards of several aspects:
1) The dimensions of the standard fastener products: the basic dimensions of the specified product content; threaded products, including the basic dimensions of the thread, the thread ending, from the shoulder, undercuts and the end of the size of the chamfer, external threaded parts and other aspects.
2) fastener product technical aspects of standards. Specific criteria for the content of the following aspects:
a) the standard of the fastener product tolerance: the specified product size tolerance and geometric tolerance aspects of the content.
b) fastener product standards of the mechanical properties: the mark of the specified mechanical performance levels, and mechanical properties of the project and the requirements of the content; changed some of fastener products will be the content or performance of the product materials. contents.
c) the standards of the fastener surface defects: the specified product types of surface defects and the specific requirements of the content.
d) fastener products, surface treatment standards: the contents of the specified product type of surface treatment and the specific requirements.
e) fastener product testing standards: specific provisions of the various performance requirements of the aspects of the trial.
3) Fasteners product acceptance inspection, marking and packaging standards: specified products factory acceptance test examination of the project acceptable quality level and sampling programs, and product logos and packaging aspects.
4) fastener product labeling methods standards: content of the complete labeling method of the specified products and simplify the labeling method.
5) fasteners other aspects of the standards: such as the standard terminology of fasteners, fastener product weight standards.
All knowledge of the above, I think we must fasteners have more understanding, but also a certain amount of help you open up the career path. Saying: Know thyself, be victorious! Related products are not familiar with, but also critical success?


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