Fasteners usually include 13 types of parts

July 20, 2023

Two small knowledge of hardware stainless steel fasteners Home > News Center > Industry News Two small knowledge of hardware stainless steel fasteners Stainless steel is used as material for fasteners. It can be said that it has great advantages in all aspects of manufacture, use or handling. Among the firmware solutions, it is still a relatively economical one.

Stainless steel magnetic problems of fasteners

If stainless steel is used as the main material for fasteners, it is necessary to understand the magnetic properties of stainless steel itself. Stainless steel is generally considered non-magnetic, but in fact austenitic series materials may appear magnetic to a certain extent after a certain processing technology, but it is not correct to think that magnetism is the standard for judging the quality of stainless steel fasteners. precise.
When selecting fasteners, whether the stainless steel material is magnetic or not does not indicate its quality. In fact, some chromium-manganese stainless steels are stainless steels that are not magnetic. Chromium-manganese stainless steel in stainless steel fasteners cannot replace the use of 300 series stainless steel, especially in high-medium corrosive working environments.

The use of nickel in fasteners
In the process of using stainless steel as the material of fasteners, they used to rely more on the use of nickel. However, when the global price of nickel is rising, the price of fasteners has also been greatly affected. In order to alleviate the cost pressure and improve the competitiveness of fasteners, fastener manufacturers have specially searched for alternative materials and produced low-nickel stainless steel fasteners.

It usually includes the following 13 types of parts: 1. Bolt: A type of fastener consisting of a head and a screw (a cylinder with external threads), which needs to be matched with a nut to fasten and connect two parts with through holes. This connection form is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

2. Stud: There is no head, only a type of fastener with external threads at both ends. When connecting, one end of it must be screwed into a part with an internally threaded hole, the other end must pass through a part with a through hole, and then screw on a nut, even if the two parts are tightly connected into one piece. This type of connection is called a stud connection, and it is also a detachable connection. It is mainly used in occasions where one of the parts to be connected has a large thickness and requires a compact structure, or where bolt connection is not suitable due to frequent disassembly.

3. Screws: It is also a type of fastener consisting of two parts, the head and the screw. It can be divided into three categories according to the purpose: machine screws, set screws and special purpose screws. Machine screws are mainly used for a fastened connection between a part with a fixed threaded hole and a part with a through hole, without the need for nut fit (this connection form is called screw connection, which is also a detachable connection; it can also be Cooperate with nuts for fast connection between two parts with through holes.) Set screws are mainly used to fix the relative position between two parts. Special-purpose screws, such as ring screws, are used for lifting parts.

4. Nuts: with internal threaded holes, generally in the shape of a flat hexagonal column, and also in the shape of a flat square column or a flat cylinder, with bolts, studs or machine screws, used to fasten and connect two parts, so that become a whole.

5. Self-tapping screws: Similar to machine screws, but the threads on the screw are special threads for self-tapping screws. It is used to fasten and connect two thin metal components to make them into a whole. A small hole needs to be made on the components. Because of the high hardness of this kind of screw, it can be directly screwed into the hole of the component to make the component Responsive internal thread

6. Wood screw: It is also similar to the machine screw, but the thread on the screw is a special wood screw thread, which can be directly screwed into a wooden component (or part), and is used to put a metal (or non-metal) with a through hole. Parts are fastened together with a wooden member. This connection is also a detachable connection. 

7. Washer: A type of fastener in the shape of an oblate ring. Placed between the supporting surface of the bolt, screw or nut and the surface of the connected part, it plays the role of increasing the contact surface area of the connected part, reducing the pressure per unit area and protecting the surface of the connected part from being damaged; another type of elastic washer, It can also play a role in preventing the nut from loosening. 

8. Retaining ring: It is installed in the shaft groove or hole groove of the machine and equipment, and plays the role of preventing the parts on the shaft or hole from moving left and right. 

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

10. Rivet: A type of fastener consisting of a head and a shank, used to fasten and connect two parts (or components) with through holes to make them a whole. This form of connection is called a rivet connection, or riveted for short. genus with non-detachable connection. Because to separate the two parts connected together, the rivets on the parts must be broken. 

11. Assemblies and connecting pairs: Assemblies refer to a type of fasteners supplied in combination, such as the combination of certain machine screws (or bolts, self-supplied screws) and flat washers (or spring washers, lock washers); connection Auxiliary refers to a type of fastener that is supplied in combination with a special bolt, nut and washer 

12. Welding stud: Due to the heterogeneous fastener composed of light energy and nail head (or no nail head), it is fixedly connected to a part (or component) by welding method, so as to connect with other parts. 13. Wire screw sleeve: The wire screw sleeve is a new type of threaded connection element, which is refined from high-strength, high-precision corrosion-resistant rhombic wire. Shaped like a spring, it is installed in a specific screw hole of the substrate, and its inner surface forms a standard thread. When it is matched with a screw (bolt), it can significantly improve the thread connection strength and wear resistance; especially in low-strength aluminum, magnesium, cast iron, plastics, etc. material. The locking type is to add one or several locking rings on the basis of the ordinary type. Xinxiang Yongda Industrial Co., Ltd. is a professional manufacturer of wire thread inserts. It is recommended that the wire thread inserts be embedded in the threads of low-strength engineering materials such as aluminum, magnesium alloy, cast iron, glass fiber reinforced plastic, plastic, etc., and can form standard M and MJ threads. It has the functions of continuous strength, impact resistance and wear resistance, and can disperse stress to protect the thread of the substrate, greatly extending the service life of the substrate. At the same time, it improves the stress of the thread, forms an elastic connection, eliminates the error of pitch and half-angle between the internal and external threads, makes the load on the thread evenly distributed, protects the base thread from damage, and prolongs the service life.

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