4.8 level
GB5783 Blue Zinc Plated Carbon Steel Full Thread Hex Head Bolts predominantly utilize carbon steel as the base material, commonly in grades such as 4.8, 8.8, and 10.9.
Description
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Product Material
GB5783 Blue Zinc Plated Carbon Steel Full Thread Hex Head Bolts predominantly utilize carbon steel as the base material, commonly in grades such as 4.8, 8.8, and 10.9. Lower - grade 4.8 carbon steel offers fundamental strength, making it appropriate for general - purpose fastening tasks where load requirements are relatively moderate, such as light - duty furniture assembly or basic equipment installation. Higher - grade carbon steels, like 8.8 and 10.9, can undergo heat treatment to significantly enhance their tensile strength, hardness, and toughness. This enables them to withstand heavier loads and more arduous mechanical stresses, rendering them suitable for industrial applications, construction projects, and heavy - machinery assembly.
The defining feature of these bolts is the blue zinc plating surface treatment. Zinc plating involves electroplating a layer of zinc onto the carbon steel bolt surface. The addition of specific chemical agents during the plating process imparts a blue hue to the zinc coating. This zinc layer serves as a sacrificial barrier, corroding preferentially to protect the underlying carbon steel, thereby enhancing the bolt's corrosion resistance.
Product Models
The product line of GB5783 Blue Zinc Plated Carbon Steel Full Thread Hex Head Bolts includes various models categorized according to the standard's specifications, along with size, length, and strength grade:
Standard Metric Models: In line with the GB5783 standard, these bolts are available in a wide range of metric sizes. Diameters typically range from M5 to M64, while lengths can vary from 10mm to 500mm. Standard models feature a full - thread design, where the threads extend along the entire length of the bolt shank, ensuring consistent fastening performance throughout. These bolts are suitable for general - purpose applications that comply with the GB5783 standard, providing a reliable and cost - effective fastening solution for a variety of projects.
High - Strength Models: Engineered for heavy - duty applications, high - strength bolts are made from higher - grade carbon steel, often with strength grades like 8.8 and 10.9. These bolts have larger diameters and longer lengths to handle substantial tensile and shear forces. They are essential in industrial settings for securing heavy machinery, large - scale structural components in construction, and equipment operating under high loads and vibrations. High - strength models strictly adhere to the dimensional and performance requirements of the GB5783 standard, ensuring reliable performance in demanding environments.
Special - Length Models: For applications with specific length requirements, special - length models are available. These bolts can have non - standard lengths that fall within the tolerance range specified by the GB5783 standard. They are designed to meet the needs of unique assembly scenarios, such as joining components with specific spacing requirements or working in confined spaces where standard - length bolts are not suitable.
Manufacturing Process
The production of GB5783 Blue Zinc Plated Carbon Steel Full Thread Hex Head Bolts involves multiple precise steps while strictly complying with the GB5783 standard and quality - control measures:
Material Preparation: High - quality carbon steel raw materials, such as steel bars or rods, are carefully sourced. Rigorous inspections are carried out to verify the chemical composition, mechanical properties, and surface quality of the materials, ensuring they meet the requirements for different strength grades and the GB5783 standard. The steel materials are then cut into appropriate lengths according to the specific size requirements of the bolts.
Forming: Metal bolts are typically formed through cold - heading or hot - forging processes. Cold - heading is commonly used for smaller - sized bolts. In this process, the steel is shaped into the characteristic hex head and the bolt shank using dies in multiple stages. This method is efficient for high - volume production and can create accurate thread forms and bolt shapes while maintaining compliance with the GB5783 standard's dimensional tolerances. Hot - forging is applied to larger or higher - strength bolts, where the steel is heated to a malleable state and then shaped under high pressure to achieve the required strength and dimensional accuracy as per the standard.
Threading: After forming, the bolts undergo threading operations. Thread rolling is the preferred method as it creates a stronger thread by cold - working the metal, improving the fatigue resistance of the bolts. Specialized threading dies are used to ensure that the thread pitch, profile, and dimensions precisely match the requirements of the GB5783 standard, guaranteeing compatibility with corresponding nuts and threaded holes.
Heat Treatment (for high - strength bolts): Bolts made from high - strength carbon steel grades like 8.8 and 10.9 often undergo heat - treatment processes, including annealing, quenching, and tempering. These processes optimize the mechanical properties of the bolts, increasing their strength, hardness, and toughness to meet the stringent strength requirements specified in the GB5783 standard for high - strength applications.
Blue Zinc Plating: The bolts are first thoroughly cleaned to remove any contaminants, oil, or rust. Then, they are immersed in an electroplating bath containing zinc salts and specific chemical additives. An electric current is applied, causing zinc ions to deposit on the bolt surface. The addition of chemical agents during plating imparts a blue color to the zinc coating. After plating, the bolts may undergo post - treatment processes, such as passivation, to further enhance the corrosion resistance and durability of the zinc coating.
Quality Inspection: Every batch of bolts is subject to rigorous inspection in accordance with the GB5783 standard. Dimensional checks are performed to ensure that the bolt's diameter, length, thread specifications, and head size meet the standard's precise requirements. Mechanical tests, including tensile strength, hardness, and torque tests, are conducted to verify that the bolts can withstand the specified loads and meet the strength and performance criteria. Visual inspections are carried out to check for surface defects, proper blue zinc plating coverage, and any non - compliance with the standard's appearance requirements. Only bolts that pass all quality tests are approved for packaging and distribution.
Surface Treatment Process
The blue zinc plating surface treatment is a key feature that provides both protection and identification for these bolts:
Zinc Plating Process: The zinc plating process begins with a thorough cleaning of the bolt surface through degreasing and pickling to remove any dirt, oil, or oxide layers. This ensures good adhesion of the zinc coating. The bolts are then immersed in an electroplating bath containing zinc - rich electrolyte solutions. When an electric current is passed through the bath, zinc ions are attracted to the bolt surface and deposit as a metallic layer. The thickness of the zinc coating can typically range from 5 - 15 microns, depending on the application requirements and the standard's specifications, providing a primary layer of corrosion protection.
Blue Coating Formation: The distinctive blue color of the zinc coating is achieved by adding specific chemical agents to the electroplating bath. These agents react with the zinc during the plating process to form a thin, colored film on the surface of the zinc layer. This blue coating not only serves as an aesthetic identifier but also provides additional corrosion resistance by enhancing the passivation properties of the zinc surface.
Post - Treatment: After zinc plating, the bolts may undergo post - treatment processes, such as passivation. Passivation involves immersing the bolts in a chemical solution, usually containing chromates or other passivating agents. This process forms a thin, protective oxide layer on the zinc surface, further enhancing its corrosion resistance and durability. The passivation treatment also helps to stabilize the blue color of the coating and improve its resistance to fading and abrasion.
Application Scope
GB5783 Blue Zinc Plated Carbon Steel Full Thread Hex Head Bolts are widely used across multiple industries and applications that adhere to the GB5783 standard:
Construction Industry: In construction projects, these bolts are used for various structural connections, including fastening steel beams, columns, and trusses. Their compliance with the GB5783 standard ensures reliable and standardized fastening, contributing to the overall stability and integrity of buildings and infrastructure. The blue zinc plating provides corrosion resistance, making them suitable for both indoor and outdoor construction applications.
Industrial Machinery Manufacturing: In the manufacturing of industrial machinery, these bolts are essential for assembling components, securing equipment frames, and attaching various parts. High - strength models can withstand the heavy loads and vibrations generated during machinery operation. The full - thread design ensures consistent and secure fastening throughout the length of the bolt, while the blue zinc plating protects the bolts from industrial pollutants and moisture, extending their service life.
Automotive and Transportation Industries: In the automotive and transportation sectors, these bolts are used for vehicle assembly, such as attaching engine components, chassis parts, and body panels. Their standardized design according to the GB5783 standard ensures compatibility and interchangeability, facilitating efficient production and maintenance. The corrosion - resistant blue zinc plating helps the bolts withstand the harsh operating conditions, including exposure to road salts, moisture, and varying weather conditions.
General Equipment Installation and Maintenance: For general equipment installation and maintenance tasks in various industries, these bolts offer a reliable and cost - effective fastening solution. Their availability in a wide range of sizes and strength grades, as per the GB5783 standard, makes them suitable for different types of equipment and applications. The easy - to - identify blue zinc plating also helps in quickly distinguishing them from other bolts during installation and replacement processes.
Product Advantages
Standardized Design: Complying with the GB5783 standard, these bolts offer a standardized design, ensuring compatibility and interchangeability across different projects and industries. This standardization simplifies the procurement, installation, and maintenance processes, reducing the risk of errors and saving time and costs.
Good Corrosion Resistance: The blue zinc plating provides effective corrosion resistance, protecting the carbon steel bolts from rust and degradation. This makes them suitable for use in a variety of environments, including those with moisture, humidity, and mild corrosive substances, extending the service life of the bolts and the components they fasten.
Full - Thread Design: The full - thread design ensures consistent and reliable fastening along the entire length of the bolt shank. This is particularly beneficial in applications where a uniform clamping force is required or when the bolt needs to be tightened through multiple layers of materials, providing enhanced stability and load - bearing capacity.
High Strength Options: Available in different strength grades, including high - strength variants, these bolts can meet the diverse load - bearing requirements of various applications. High - strength bolts made from heat - treated carbon steel can withstand significant tensile and shear forces, making them suitable for heavy - duty and critical - load applications.
Easy Identification: The distinctive blue color of the zinc coating makes these bolts easily identifiable, facilitating quick selection and installation during assembly and maintenance tasks. This visual identification helps prevent mix - ups with other types of bolts, improving work efficiency and reducing the risk of incorrect installations.
Cost - Effective: Offering a balance of performance and cost, GB5783 Blue Zinc Plated Carbon Steel Full Thread Hex Head Bolts provide a cost - effective fastening solution for a wide range of applications. Their standardized production, availability in various sizes and strengths, and good corrosion resistance contribute to overall cost savings in projects by reducing the need for frequent replacements and maintenance.
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