Premium tooth bar screw grade 8.8, 10.9, 12.9 Material: 45 # 40Cr, 35CrMoA, 42CrMo B7、 Double headed, fully fastened, various lathe precision machined special-shaped parts. Surface treatment: black, electroplated zinc, blue white, silver white, hot-dip galvanized, Dacromet, etc. Screw, also known as thread bar or fully threaded bolt, is mainly used for connecting, transmitting, and supporting in mechanical equipment Has the following characteristics: Connection function: Screw teeth usually do not have a head, and both ends have chamfers. It is a type of fastener with full thread on a threaded column. It can be used as a connecting element between thicker components, for example, when two thicker plates or parts need to be connected together, using screw teeth and nuts for fastening can provide reliable connections and ensure stable relative positions between components. Transmission function: capable of converting rotational motion into linear motion, or converting linear motion into rotational motion. When the screw thread is matched with a nut with corresponding threads, the rotation of the screw thread can cause the nut to move in a straight line along the axis direction of the screw thread, achieving precise displacement transmission. On the contrary, when the nut moves in a straight line, it can also drive the screw teeth to rotate. This transmission method is widely used in many mechanical equipment, such as the feed system of machine tools and the conveying device of automated production lines, which can achieve precise position control and motion transmission. Support function: Due to the strength and rigidity of the screw teeth, they can also serve as support in some structures. For example, in certain frame structures or cantilever structures, screw teeth can serve as support members to withstand certain axial loads and lateral forces, helping to maintain the stability and integrity of the structure. Multiple thread types: There are different thread types for screw threads, such as triangular thread, trapezoidal thread, rectangular thread, serrated thread, etc. Each thread type has its specific profile and purpose. For example, trapezoidal tooth thread processing is relatively simple, and the tightness of the nut and screw can be adjusted according to the depth of the teeth. The internal and external threads are tightly adhered to the conical surface and are not easy to loosen. The process is good, the root strength is high, and the alignment is good. It is commonly used for transmission threads; The serrated tooth thread has an unequal trapezoidal tooth shape, with a small tooth flank angle on the working surface and a large tooth flank angle on the non working surface. The external thread root has a large rounded corner, which can reduce stress concentration. It also has the characteristics of high efficiency in rectangular thread transmission and high strength of trapezoidal thread root, and is suitable for one-way force transmission threads. Wide application fields: Screw teeth are widely used in many fields such as electromechanical seismic resistance, aerospace industry, mechanical and chemical industry, building decoration, furniture manufacturing, etc. due to their functions and characteristics. In the field of construction, it can be used for ceiling installation on construction sites, etc; In the field of furniture, it is commonly used to connect various components of furniture; In the field of mechanical manufacturing, it plays an important role in various machine tools, automation equipment, and transmission devices. Mon M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 M42 p 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5 2.5 3 3 3.5 3.5 4 4 4.5

Function -Efficient connection: Through riveting technology, nuts can be quickly and firmly connected to thin plates and other materials without welding or tapping, improving assembly efficiency. In electronic product assembly, the nut can be quickly pressed and riveted onto the thin plate of the circuit board to achieve connection with other components. -Provide reliable threaded connections: Provide standard internal threaded connections for bolts and other components to ensure stability and reliability of the connection, withstand certain torque and tension, and ensure that the connection between components is tight and not loose. -Enhance the strength of thin plate connections: For thinner plates, rivet nuts can increase the strength and load-bearing capacity of the connection points, disperse pressure, and avoid deformation or damage of the plate due to excessive local pressure. For example, riveting nuts on thin sheets of car bodies can improve the overall strength of the body structure. -Convenient disassembly and maintenance: The threaded connection method of the rivet nut makes the disassembly and maintenance of components convenient. The bolts can be easily unscrewed for component replacement or maintenance without damaging the board. Purpose -Electronic and electrical industry: widely used for connecting components such as casings and circuit boards of electronic products such as computers, mobile phones, and televisions, such as fixing batteries inside mobile phones and connecting circuit boards. -Automotive manufacturing industry: used for connecting parts such as car bodies, interior parts, engines, etc., such as installing car seats and fixing instrument panels, which can meet the requirements of efficient assembly and high-strength connection in automotive production. -Aerospace field: It plays a role in the connection of aircraft interiors, structural components, etc., and can meet the strict requirements of lightweight and reliability in the aerospace field while ensuring connection strength. -Hardware products industry: Used for connecting and fixing components in various metal furniture, doors and windows, kitchen and bathroom equipment, such as installing hinges on furniture and fixing handles on doors and windows. product grade -Grade A: High precision, strict dimensional tolerance control, good surface quality, suitable for applications with high requirements for connection accuracy and reliability, such as aerospace, high-end electronic equipment manufacturing, and other fields. -B-class: slightly inferior in accuracy and quality compared to A-class, capable of meeting the connection requirements in general industrial production, commonly used in industries such as general machinery manufacturing and automotive parts production. Material performance grade -Carbon steel material: commonly available in grades 4.8 and 8.8. 4.8 grade carbon steel rivet nut, with a nominal tensile strength of 400MPa and a yield strength ratio of 0.8, suitable for connection applications with general strength requirements; 8.8 grade carbon steel rivet nut, with a nominal tensile strength of 800MPa and a yield ratio of 0.8, is commonly used in mechanical connections with high requirements for strength and reliability. -Stainless steel material: commonly labeled as A2-70, A4-80, etc. The “A2” in A2-70 represents the second group A2 material of austenitic steel, and “70” represents the performance grade of the product, with a nominal tensile strength of 700MPa; The tensile strength of A4-80 is 800MPa, which has better corrosion resistance and is suitable for harsh corrosive environments.

The functions and roles of expansion screws mainly include the following: -Connection and fixation: It can firmly connect or fix objects to various substrates, such as fixing metal components, wooden furniture, electrical equipment, etc. to walls, ceilings, or floors, ensuring that they will not easily loosen or fall off during use. -Provide strong tensile and shear forces: The expansion screw is designed with a special structure. When tightening the nut, the screw will drive the expansion tube to expand, making it tightly fit with the substrate, thereby generating a large frictional and biting force. It can withstand large tensile and shear forces and meet the load-bearing needs in different scenarios. -Adapt to different substrate materials: Whether on hard substrates such as concrete, brick walls, or stone, or on relatively soft substrates such as wood and plastic, as long as the appropriate expansion screw model and specifications are selected, reliable fixation can be achieved. -Easy to install and disassemble: During installation, simply drill a hole in the base, insert the expansion screw into the hole, and tighten the nut to complete the installation. If disassembly is required, unscrew the nut and the expansion screw can be removed from the base, and the damage to the base is relatively small, making it easy for subsequent maintenance or component replacement.

Function 1. Tightening function: By cooperating with bolts, it plays a role in connecting and fastening two or more components.2. Pressure dispersion: The four claws can distribute pressure over a larger area, reducing local pressure on the connecting components and preventing damage.3. Increase friction: Compared to ordinary nuts, four jaw nuts have a larger contact area with the connected components, providing greater friction and making the connection more stable. Purpose 1. Mechanical manufacturing: Used in the assembly of various mechanical equipment to connect different parts and ensure the structural stability of the equipment.2. In the field of architecture: it can be used to connect components in building structures, such as steel beams, steel columns, etc.3. Automotive manufacturing: plays an important role in the assembly of parts such as the engine and chassis of a car.4. Furniture manufacturing: used to connect various components of furniture to make it more sturdy and durable. Mon M4 M5 M6 M8 M10 P 0.7 0.8 1 1.25 1.5 ds 5.6 6.5 7.7 10 12 h 6.95 9.15 10.3 12.75 14.5 dk 15 17 19 22 25.5 k 0.95 1.15 1.3 1.75 1.5

Function -Connection fastening: By cooperating with nuts and utilizing the mechanical principle of threads, two or more components can be tightly connected and fixed together, capable of withstanding various loads such as tension and pressure, ensuring the stability and reliability of the connection structure. -Corrosion prevention: The hot-dip galvanized layer can form a protective film of zinc iron alloy on the surface of the bolt, which has good chemical stability and can effectively prevent the corrosion of the bolt substrate by substances such as oxygen, moisture, acid and alkali salts in the atmosphere, extending the service life of the bolt. -Wear resistance: The hot-dip galvanized layer increases the surface hardness of the bolt, reducing the wear caused by contact with other components during assembly and use, ensuring the dimensional accuracy and performance of the bolt, and enabling it to be reused multiple times. Purpose -In the field of architecture: used for connecting steel structures in building structures, such as the connection nodes between steel beams and steel columns; It is also used for fixing embedded parts in concrete structures, installing building curtain walls, and installing glass curtain walls in large commercial buildings. -Power engineering: used for the connection and fixation of various components of transmission towers in the construction of transmission lines; In the substation, it is used for the installation and fixation of electrical equipment, such as transformers, switchgear, etc. -Mechanical manufacturing: The manufacturing and assembly of various types of mechanical equipment cannot do without hot-dip galvanized bolts, such as in machine tools, industrial robots, agricultural machinery and other equipment, used to connect various mechanical components and ensure the normal operation of the equipment. -Automobile manufacturing: The assembly of the engine, chassis, body and other parts of the car requires the use of hot-dip galvanized bolts, such as the assembly of the engine cylinder block, the connection of the chassis suspension system, and the fixation of the body shell. -Bridge engineering: Whether it is highway bridges or railway bridges, hot-dip galvanized bolts are used for connecting bridge steel structures, fixing bridge supports, and installing bridge ancillary facilities, ensuring the structural safety and stability of bridges.