Stainless steel external hexagon bolts
DIN933 Ms hex nut bolts are crafted from diverse materials, with carbon steel being a prevalent choice, available in multiple strength grades such as 4.6, 5.8, 8.8, and 12.9.
Description
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Product Material
DIN933 Ms hex nut bolts are crafted from diverse materials, with carbon steel being a prevalent choice, available in multiple strength grades such as 4.6, 5.8, 8.8, and 12.9. Lower - grade 4.6 carbon steel offers basic strength, making it suitable for general - purpose applications where load requirements are relatively low, like simple household item assembly. The 5.8 - grade steel provides slightly enhanced strength and is often used in common mechanical equipment with moderate load demands.
Higher - grade carbon steels, including 8.8 and 12.9, contain alloying elements such as manganese, silicon, and in the case of 12.9 - grade, more stringent control of impurities and precise heat treatment. The 8.8 - grade bolts, after heat treatment, exhibit good tensile strength and are applicable for industrial machinery and general construction projects. The 12.9 - grade bolts, being of high - strength, are heat - treated to achieve excellent mechanical properties, capable of withstanding heavy loads, high stress, and vibrations, and are thus ideal for critical structural connections in automotive engines, heavy - duty machinery, and large - scale construction.
For applications that demand enhanced corrosion resistance, stainless steel is also utilized, commonly in grades 304 and 316. 304 stainless steel offers good general - purpose corrosion protection, suitable for indoor and many outdoor applications with moderate environmental exposure. 316 stainless steel, with its higher molybdenum content, provides superior resistance to harsh chemicals, saltwater, and extreme conditions, making it suitable for marine, chemical, and food - processing industries.
Product Models
The product line of DIN933 Ms hex nut bolts, featuring heavy hex - headed tap bolts in sizes M4, M5, M6, M8, M10, and M12, is categorized based on size, strength grade, and application requirements:
Standard Metric Size Models: Available in metric sizes M4, M5, M6, M8, M10, and M12, these bolts cover a wide range of diameters to meet different fastening needs. Smaller sizes like M4 and M5 are often used in electronics, precision instruments, and light - duty mechanical assemblies where space is limited and smaller fasteners are sufficient. Larger sizes, such as M10 and M12, are suitable for heavy - duty applications, including construction, large - scale machinery, and automotive chassis assembly, where greater load - bearing capacity is required.
Strength - Graded Models: The bolts come in strength grades 4.6, 5.8, 8.8, and 12.9. 4.6 - grade bolts are basic - strength models, used for non - critical connections where minimal load is applied. 5.8 - grade bolts offer a step - up in strength and are used in general - purpose mechanical and light - construction projects. 8.8 - grade bolts are medium - strength models, commonly employed in industrial equipment, furniture manufacturing, and general construction where more reliable fastening is needed. 12.9 - grade bolts are high - strength models, specifically designed for heavy - duty applications where high stress, vibration, and heavy loads are involved, such as in the aerospace and automotive industries for engine and suspension system assembly.
Special - Application Models: For specific application scenarios, there are special - application models. In some cases, bolts with extended thread lengths or custom - made lengths are available to meet unique assembly requirements. Additionally, bolts with special surface treatments for specific environmental conditions, such as anti - galling coatings for applications where bolts are frequently tightened and loosened, or coatings for enhanced lubricity in high - friction environments, can be provided to cater to specialized needs.
Manufacturing Process
The production of DIN933 Ms hex nut bolts involves multiple precise steps and strict adherence to DIN933 standards:
Material Preparation: High - quality raw materials, whether carbon steel or stainless steel, are carefully sourced. Rigorous inspections are carried out on the chemical composition, mechanical properties, and surface quality of the materials to ensure compliance with relevant standards and grade requirements. The metal materials are then cut into appropriate lengths according to the specified bolt sizes.
Forming: For carbon steel bolts, cold - heading or hot - forging processes are commonly used. Cold - heading is efficient for mass - producing smaller - sized bolts. In this process, the metal is shaped into the characteristic hex head and bolt shank using dies in multiple stages, maintaining high production efficiency and dimensional accuracy. Hot - forging is applied to larger - diameter or high - strength bolts (such as 12.9 - grade). The metal is heated to a malleable state and then shaped under high pressure to achieve the required strength and precise dimensions. For stainless steel bolts, similar forming methods are employed, with adjustments made according to the material's properties.
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, enhancing 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 DIN933 standard, guaranteeing compatibility with corresponding nuts and threaded holes.
Heat Treatment (for high - strength grades): Bolts of strength grades 8.8 and 12.9, especially those made of carbon steel, undergo heat - treatment processes including annealing, quenching, and tempering. Annealing softens the steel and eliminates internal stress; quenching increases the hardness and strength; and tempering adjusts the hardness and toughness to the optimal level, ensuring that the bolts achieve the required mechanical properties for their respective strength grades.
Nut Manufacturing: Nuts are manufactured through processes such as cold - forming or machining. Cold - forming is used for mass - producing standard nuts, where the metal is shaped into the hex nut form using dies. Machining is employed for nuts with special requirements or for small - batch production, allowing for more precise control of dimensions. The nut threads are also carefully processed to ensure proper engagement with the bolts and compliance with the DIN933 standard.
Quality Inspection: Every batch of bolts and nuts is subject to rigorous inspection in accordance with DIN933 standards. Dimensional checks are performed to ensure that the diameter, length, thread specifications, and head size of the bolts and nuts meet the standard's precise requirements. Mechanical tests, including tensile strength, hardness, and torque tests, are carried out to verify the load - bearing capacity and performance of the bolts and nuts. Visual inspections are conducted to check for surface defects, cracks, or improper thread formations. Only products that pass all quality tests are approved for packaging and distribution.
Surface Treatment Process
Surface treatments for DIN933 Ms hex nut bolts are carried out to enhance their performance and lifespan:
Zinc Plating: For carbon steel bolts, zinc plating is a common treatment. The bolts are first cleaned to remove contaminants, then electroplated with a layer of zinc. This zinc layer acts as a sacrificial barrier, corroding preferentially to protect the underlying steel. Zinc plating provides basic corrosion protection and is suitable for indoor and less - corrosive outdoor applications. It also gives the bolts a bright, metallic appearance.
Hot - Dip Galvanizing: In more demanding environments, hot - dip galvanizing is applied. The bolts are degreased, pickled to remove rust and scale, fluxed, and then immersed in a molten zinc bath at around 450 - 460°C. The zinc reacts with the iron in the steel to form a series of zinc - iron alloy layers, followed by a pure zinc outer layer. The resulting thick and durable galvanized coating offers excellent corrosion resistance, making the bolts suitable for long - term outdoor use and harsh environments, such as industrial areas or coastal regions.
Black Oxide Coating: Black oxide coating is a chemical process that forms a thin, black, corrosion - resistant layer on the surface of carbon steel bolts. This coating not only provides some level of corrosion protection but also gives the bolts a uniform, matte black appearance, which is often preferred in applications where aesthetics and moderate corrosion resistance are required. The black oxide layer is relatively thin and may require additional topcoats for enhanced corrosion protection in more severe environments.
Stainless Steel Passivation: For stainless steel bolts, passivation treatment is carried out. This involves immersing the bolts in an acid solution to remove surface contaminants, iron particles, and to enhance the natural passive oxide layer on the stainless - steel surface. Passivation improves the corrosion resistance of stainless steel, especially in environments where chloride ions or other corrosive substances may be present, ensuring the long - term reliability of the bolts.
Specialized Coatings: In some cases, bolts and nuts may receive specialized coatings. Anti - seize coatings prevent the bolts from seizing up due to oxidation or high - temperature exposure, which is particularly important in applications where the bolts may need to be removed and reinstalled frequently. Teflon coatings can be applied to reduce friction during installation and use, making it easier to tighten and loosen the bolts and nuts.
Application Scope
DIN933 Ms hex nut bolts are widely applied across multiple industries:
Mechanical Equipment Manufacturing: In mechanical equipment manufacturing, these bolts are used for assembling various components. Different strength grades are selected according to the load requirements of the equipment. For example, 4.6 and 5.8 - grade bolts are used for light - duty components, while 8.8 and 12.9 - grade bolts are essential for heavy - duty parts such as engine blocks, gearboxes, and heavy - machinery frames, ensuring the stability and reliable operation of the equipment.
Building and Construction: In the construction industry, they are used for connecting structural elements. Medium - strength 8.8 - grade bolts are commonly used for general construction tasks, such as joining steel beams and columns in buildings. High - strength 12.9 - grade bolts are used in critical structural connections of large - scale buildings, bridges, and infrastructure projects, where they need to withstand heavy loads and environmental stresses, contributing to the overall stability and safety of the structures.
Automotive and Aerospace Industries: In the automotive industry, DIN933 bolts are used in engine assembly, chassis construction, and suspension systems. The high - strength 12.9 - grade bolts are crucial for securing engine components and ensuring the vehicle's performance and safety under various driving conditions. In the aerospace industry, where strict quality and performance standards are required, these bolts are used for assembling aircraft components. Their precise manufacturing and reliable performance are essential for the safety and functionality of aircraft.
Electronics and Electrical Equipment: In the electronics and electrical industries, smaller - sized bolts like M4 and M5 are used for securing circuit boards, enclosures, and other components. The fine - thread options available for some sizes allow for precise fastening without damaging delicate electronic components. The corrosion - resistant properties of stainless - steel bolts in this series are also beneficial for electrical equipment used in humid or corrosive environments.
Furniture and Woodworking: In furniture making and woodworking, these bolts are used for joining wooden, metal, or composite components. The hex - nut - bolt combination provides a strong and reliable connection, and the variety of sizes and strength grades can meet different furniture design and structural requirements, ensuring the stability and durability of the furniture pieces.
Product Advantages
Standardized Design and Compatibility: Complying with the DIN933 standard, these bolts and nuts offer a standardized design, ensuring excellent compatibility across different projects and industries. The standardized dimensions and thread specifications allow for easy replacement and interchangeability, simplifying the procurement, installation, and maintenance processes, and reducing the risk of errors in assembly.
Diverse Strength Options: With strength grades ranging from 4.6 to 12.9, these bolts can meet a wide variety of load - bearing requirements. This diversity enables users to select the most appropriate bolts for different applications, from light - duty tasks to heavy - duty, high - stress connections, providing a flexible and reliable fastening solution.
Corrosion Resistance: Through various surface treatments such as zinc plating, hot - dip galvanizing, and stainless - steel passivation, these bolts offer good to excellent corrosion resistance. This makes them suitable for use in different environments, including outdoor, marine, and corrosive industrial settings, extending their service life and reducing maintenance costs.
Reliable Fastening: The hex - nut - bolt combination provides a secure and reliable fastening method. The hexagonal shape of the head and nut allows for easy tightening and loosening with wrenches, and the precise thread design ensures a tight fit, capable of withstanding different types of mechanical loads, including tension, shear, and vibration, ensuring the stability of the connected components.
Cost - Effective: Due to their standardized production and wide availability, DIN933 Ms hex nut bolts offer a cost - effective solution for fastening needs. The ability to choose the appropriate strength grade and size according to the specific application requirements also helps optimize costs, as users do not need to over - specify high - strength bolts for low - load applications.
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