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                        What do fasteners include?

                        2019-06-04

                        What kinds of fasteners include? According to Yu Wenlong, a consultant of fasteners, fasteners usually include the following 12 types of parts:

                        1. Bolts: A class of fasteners consisting of a head and a screw (a cylinder with external threads) that need to be matched with nuts to fasten and connect two parts with through holes. Yu Wenlong, a fastener consultant, believes that this form of connection is called bolt connection. If the nut is screwed off from the bolt, the two parts can be separated, so the bolt connection belongs to the removable connection.

                        2. Screw: No head, only a kind of fastener with threads at both ends. When connecting, one end must be screwed into a part with an internal thread hole, the other end must pass through the part with a through hole, and then the nut is screwed up, even if the two parts are tightly connected into a whole. According to Yu Wenlong, a fastener consultant, this type of connection is called stud connection and is also a removable connection. It is mainly used in situations where one of the connected parts is thicker, requires compact structure, or is not suitable for bolted connection because of frequent disassembly.

                        3. Screw: It is also a kind of fastener consisting of head and screw. It can be divided into three categories according to its use: machine screw, fastening screw and special purpose screw. Yu Wenlong, a fastener consultant, believes that machine screw is mainly used for fastening parts with fixed threaded holes and does not need to be matched with a nut (this form of connection is called screw connection, which also belongs to removable connection; it can also be matched with a nut for fastening connection between two parts with through holes). Fixing screw is mainly used to fix the relative position between two parts. Special purpose screw such as ring screw for lifting parts.

                        4. Nuts: with internal threaded holes, the shape is generally flat hexagonal cylinder, but also flat square cylinder or flat cylinder, with bolts, studs or machine screw, used to fasten the connection of two parts, making it a whole.

                        Special categories of nuts

                        High strength self-locking nut

                        As a classification of self-locking nuts, it has high strength and reliability. The main premise is to introduce European technology for road construction machinery, mining machinery, vibration machinery and other equipment. At present, there are few domestic manufacturers of such products.

                        Nylon self-locking nut

                        Nylon self-locking nut is a new type of high anti-vibration and anti-loosening fastening parts, which can be used in various mechanical and electrical products at temperatures ranging from - 50 100 C. At present, the demand of nylon self-locking nuts for aerospace, aviation, tanks, mining machinery, automobile transport machinery, agricultural machinery, textile machinery, electrical products and various machinery has increased dramatically, because its anti-vibration and anti-loosening performance is much higher than other anti-loosening devices, and its vibration life is several times or even tens of times higher. Yu Wenlong, a fastener consultant, believes that more than 80% of the current mechanical equipment accidents are caused by the loosening of fasteners, especially in mining machinery. The use of nylon self-locking nuts can eliminate the major accidents caused by the loosening of fasteners.

                        5. Self-tapping screw: similar to machine screw, but the thread on the screw is special thread for self-tapping screw. It is used to fasten two thin metal components and make them a whole. Small holes need to be made in advance. Because of the high hardness of the screw, it can be directly screwed into the holes of the components to form internal threads in response. This form of connection is also a removable connection.

                        6. Wood screw: It is similar to machine screw, but the thread on the screw is a special thread for wood screw. It can be directly screwed into wooden components (or parts) to fasten a metal (or non-metal) part with a through hole to a wooden component. The connection is also removable.

                        7. Gasket: A kind of fastener with flat circular shape. Placing between the support surface of bolts, bolts or nuts and the surface of connecting parts plays a role in increasing the contact surface area of connecting parts, reducing unit area pressure and protecting the surface of connecting parts from being damaged. Another kind of elastic washer can also play a role in preventing the loosening of nuts.

                        8. Baffle ring: It is used in the axle groove or hole groove of machine and equipment to prevent the parts on the axle or hole from moving left and right.

                        9. Pin: Mainly for parts positioning, and some can also be used for parts connecting, fixing parts, transmitting power or locking other fasteners.

                        10. Rivet: A type of fastener consisting of a head and a nail rod. It is used to fasten two parts (or components) with through holes and make them a whole. This form of connection is called rivet connection, referred to as riveting. It belongs to non-removable connection. Because in order to separate the two parts connected together, the rivets on the parts must be destroyed.

                        11. Components and connection pairs: Components refer to a kind of fasteners supplied by combination, such as the combination of a machine screw (or bolt, self-supply screw) and a flat washer (or spring washer, locking washer); the connection pair refers to a kind of fasteners supplied by a combination of special bolts, nuts and washers, such as high-strength hexagonal head bolt connection pairs for steel structures.

                        12. Welding nails: Because of the different fasteners consisting of light energy and nail head (or no nail head), they are fixed and connected to one part (or component) by welding method so as to connect with other parts.


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