Release time：2020-01-16 18:44 Browse：
### 1. Material Properties - **Composition and Corrosion Resistance** - 304 stainless steel, also known as 18/8 stainless, is composed of approximately 18% chromium and 8% nickel. Chromium forms a thin, invisible passive oxide layer on the surface, which provides excellent corrosion resistance against rust, oxidation, and common environmental factors such as moisture, mild acids, and alkalis. This makes the screws and bolts suitable for both indoor and outdoor applications, including in marine - adjacent areas, food processing facilities, and chemical plants where exposure to corrosive substances is possible. - The nickel content in 304 stainless steel contributes to its enhanced toughness and ductility, allowing the components to withstand mechanical stress without easily fracturing. It also improves the material's resistance to chloride - induced pitting corrosion, a common issue in environments with high salt concentrations. - **Strength and Durability** - 304 stainless steel offers a good balance of strength and formability. It has a minimum yield strength of around 205 MPa (29730 psi) and a tensile strength of 515 - 795 MPa (74700 - 115300 psi), depending on the manufacturing process and heat treatment. This strength makes the screws and bolts capable of withstanding heavy loads and mechanical stresses in various fastening applications. - The material's durability ensures a long service life. Its resistance to wear and fatigue means that it can endure repeated tightening and loosening cycles without significant degradation, making it a reliable choice for components that require frequent maintenance or adjustment. ### 2. Screw Design Details - **Cross Flange Structure** - The cross - head design of the screws, also known as Phillips head, provides several advantages during installation. It allows for easy engagement with a screwdriver or a power - driven bit, reducing the likelihood of the tool slipping off the head during tightening. This self - centering feature enables more efficient and precise torque application, ensuring a consistent and secure fastening. - The flange on the screw is a widened, flat area beneath the head. This design increases the contact area with the mating surface, distributing the clamping force more evenly. As a result, it reduces the risk of damage to the surface of the fastened material, such as indentation or cracking, especially when dealing with softer materials like wood, plastic, or thin - gauge metal sheets. - **Toothed Anti - Loosening Mechanism** - The toothed pattern on the flange surface of the screws is a critical anti - loosening feature. When the screw is tightened, the teeth bite into the surface of the material, creating a mechanical interlock that resists rotational forces. This is particularly important in applications subject to vibrations, such as in automotive engines, industrial machinery, or equipment mounted on moving vehicles. The toothed design helps prevent the screw from loosening over time, ensuring the long - term integrity of the assembly. - The precise spacing and depth of the teeth are carefully engineered to provide maximum grip while minimizing damage to the surface of the fastened material. Different tooth profiles can be used depending on the specific requirements of the application, with some designed for softer materials and others for harder, more robust surfaces. ### 3. Bolt Design Features - **External Hexagonal Shape** - The external hexagonal shape of the bolts is a standard and widely recognized design. It allows for the use of various tools, including open - end wrenches, socket wrenches, and torque wrenches, providing flexibility in installation and removal. The hexagonal geometry ensures a firm grip on the bolt head, enabling high - torque application when tightening, which is essential for creating strong, secure connections. - The flat sides of the hexagon also make it easier to position and align the bolt during assembly, reducing the risk of misalignment and potential damage to the threads or the fastened components. This simplicity and versatility in tool compatibility make the external hexagonal bolts a popular choice in a wide range of industries and applications. - **Concave Flange Surface** - The concave shape of the flange surface on the bolts serves multiple purposes. It helps to center the bolt more accurately on the mating surface, ensuring a more even distribution of the clamping force. This is especially important in applications where precise alignment is crucial for the proper functioning of the assembly, such as in the installation of engine components or in structural connections. - The concave design also provides additional space for the gasket, allowing it to fit snugly and effectively seal the connection. It helps to prevent the gasket from being squeezed out or displaced during tightening, ensuring a reliable seal against the ingress of fluids, gases, or contaminants. ### 4. Gasket Functionality - **Sealing and Protection** - The gaskets included with the bolts act as a sealant, preventing the leakage of fluids (such as water, oil, or chemicals) and gases. They create a tight barrier between the mating surfaces, ensuring the integrity of the system in which the bolts and screws are used. For example, in plumbing applications, gaskets prevent water from seeping out of joints, while in industrial pipelines, they maintain the pressure and prevent the escape of hazardous substances. - Gaskets also protect the fastened components from environmental damage. By preventing the entry of moisture, dust, and other contaminants, they help to extend the lifespan of the components and maintain their performance. In electrical applications, gaskets can prevent the ingress of moisture, which could cause short circuits or corrosion of electrical connections. - **Load Distribution and Vibration Damping** - Gaskets play a crucial role in distributing the load evenly across the mating surfaces. They act as a cushion, reducing stress concentrations that could otherwise lead to damage or failure of the fastened materials. This is particularly important when dealing with materials of different hardness or thicknesses, as the gasket helps to equalize the pressure and prevent localized deformation. - Additionally, gaskets can dampen vibrations, reducing the transmission of mechanical energy through the assembly. This is beneficial in applications where vibrations are common, such as in machinery or automotive components, as it helps to minimize noise, wear, and the potential for loosening of the bolts and screws over time. ### 5. Manufacturing and Quality Control - **Precision Machining** - Both the screws and bolts are manufactured using precision machining techniques. The threads are cut with high accuracy to ensure proper engagement and consistent clamping force. Advanced CNC (Computer Numerical Control) machines are often used to achieve tight tolerances in the dimensions of the components, including the diameter of the shank, the height of the head, and the pitch of the threads. - The toothed patterns on the screws and the concave shape of the bolt flanges are also precisely formed during the manufacturing process. Specialized tooling and processes are employed to ensure that the tooth profiles and the concave geometry meet the required specifications for optimal performance. - **Quality Assurance** - Rigorous quality control measures are implemented throughout the manufacturing process. Each component is inspected for dimensional accuracy, surface finish, and material integrity. Non - destructive testing methods, such as ultrasonic testing and magnetic particle inspection, may be used to detect any internal defects or flaws in the stainless steel. - Samples of the screws and bolts are also subjected to mechanical testing, including tensile strength tests, torque tests, and fatigue tests, to ensure that they meet the required performance standards. Only components that pass all quality control checks are approved for shipment and use in various applications. ### 6. Application Scenarios - **Industrial Applications** - In the industrial sector, these 304 stainless steel components are widely used in machinery assembly. For example, in the manufacturing of pumps, compressors, and conveyor systems, the cross flange toothed screws and external hexagonal gasket bolts provide secure and reliable fastening. Their corrosion resistance and strength make them suitable for withstanding the harsh operating conditions, including exposure to lubricants, coolants, and other industrial fluids. - They are also used in the construction of industrial pipelines and storage tanks. The gaskets ensure leak - free connections, while the 304 stainless steel material resists corrosion from the transported substances, such as chemicals, petroleum products, or food - grade liquids. - **Automotive and Transportation** - In the automotive industry, these components are used in various applications, from engine compartment assemblies to body - on - frame connections. The toothed screws prevent loosening due to engine vibrations, while the gasket - equipped bolts ensure a tight seal in critical areas, such as fuel lines, coolant hoses, and exhaust systems. Their durability and corrosion resistance are essential for withstanding the rigors of daily use and exposure to road salts, moisture, and other environmental factors. - In the transportation sector, including rail, aerospace, and marine applications, the 304 stainless steel screws and bolts offer reliable fastening solutions. In aircraft and ships, where weight and corrosion resistance are critical, these components provide the necessary strength and durability without adding excessive weight. - **Architectural and Construction** - In architectural and construction projects, these components are used for both structural and non - structural applications. For example, in the installation of metal facades, curtain walls, and handrails, the 304 stainless steel screws and bolts provide a secure and aesthetically pleasing fastening solution. Their corrosion resistance ensures long - term durability, even in outdoor environments exposed to rain, snow, and UV radiation. - They are also used in the construction of indoor fixtures, such as kitchen cabinets, bathroom vanities, and furniture, where a combination of strength, durability, and corrosion resistance is required. The toothed screws and gasket - equipped bolts ensure a stable and secure assembly that can withstand normal use and handling.
