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small circular washer GB848
- Product description：small circular washer GB848
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Product name
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stainless steel 316 small flat wssher plain washer
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Material
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stainless steel 316
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Color
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plain
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Specifications
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M1.6-M100
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Feature
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anticorrosive,antirust
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Though seemingly an unremarkable auxiliary component, the Small Flat Washer GB848 has become an indispensable "buffering messenger" in bolt and nut connections, thanks to its strict national standard specifications and precise functional positioning. As a flat washer category clearly defined in China's national standard GB/T 848, it boasts the characteristic of "small yet refined" and silently addresses pressure damage and loosening risks during the fastening process in fields such as machinery manufacturing, electronic equipment, and the automotive industry, safeguarding the stability and durability of connected structures.
From the perspective of standard definition, the Small Flat Washer GB848 has clear dimensional and performance specifications. According to GB/T 848-2002 Small Washers, Grade A, strict tolerance requirements apply to its outer diameter, inner diameter, and thickness. For example, for a Small Flat Washer of nominal size M3, the inner diameter tolerance must be controlled within ±0.1mm, the outer diameter tolerance within ±0.2mm, and the thickness tolerance within ±0.05mm. This standardized design ensures that Small Flat Washers GB848 produced by different manufacturers can perfectly match bolts and nuts of the same specification, avoiding assembly jams caused by dimensional deviations. Especially in automated production lines, standardized dimensions can significantly improve assembly efficiency and reduce supply chain management costs.
Compared with ordinary flat washers, the core difference of the Small Flat Washer GB848 lies in its "small size". Under the same nominal specification, its outer diameter is 15%-20% smaller than that of ordinary flat washers, and its thickness is thinner (usually 0.5-2mm). This compact design allows it to adapt to fastening scenarios with limited space, such as the connection of precision components inside electronic equipment and the fixing of end caps of small motors, without interfering with surrounding components.
Despite its simple structural design, it hides "great functions". The core function of the Small Flat Washer GB848 is to "disperse pressure and protect surfaces". When a bolt is tightened, concentrated pressure is generated between the nut and the connected part. Direct contact may cause indentations, deformation, or even cracking on the surface of parts made of relatively soft materials (such as aluminum alloy casings and plastic components). However, the Small Flat Washer GB848 can evenly disperse the concentrated pressure to a larger contact area through its flat contact. For instance, when connecting the plastic bracket of an automobile instrument panel, after matching an M5-sized bolt with the Small Flat Washer GB848, the pressure dispersion area can be expanded to 2-3 times the original size, effectively protecting the surface of the plastic bracket from damage. At the same time, it can fill in small unevenness on the surface of the connected part, reducing poor contact caused by surface roughness, ensuring the uniform transmission of bolt preload, and avoiding connection loosening caused by excessive local stress.
Material selection is the "foundation" of the Small Flat Washer GB848's performance and needs to be accurately matched according to the environmental characteristics and load requirements of the application scenario. The most common material is low-carbon steel, which has low cost and good toughness, making it suitable for dry, non-corrosive indoor scenarios, such as the assembly of household appliance casings and the fixing of office furniture screws. For humid or slightly corrosive environments (such as kitchen equipment and bathroom hardware), galvanized low-carbon steel is mostly used. Through hot-dip galvanizing or electro-galvanizing treatment, a dense zinc layer is formed on the washer surface, isolating air and moisture, slowing down the rusting rate, and ensuring the long-term stable operation of the washer.
In scenarios requiring higher corrosion resistance (such as marine equipment and chemical pipelines), the Small Flat Washer GB848 made of stainless steel (such as 304 and 316) is the first choice. The chromium and nickel elements it contains can form an oxide protective film on the surface, which can resist corrosion even in salt spray, acid, and alkali environments, ensuring the safety of the connected structure. In addition, in electronic equipment, the Small Flat Washer GB848 made of copper is also used. Utilizing the conductivity of copper, it realizes the dual functions of fastening and conduction, such as the grounding connection between the circuit board and the metal casing.
Surface treatment processes further expand the adaptability of the Small Flat Washer GB848. In addition to the common galvanizing treatment, there are various process options for different needs: Nickel plating combines rust resistance and aesthetics, with a uniform silver-white surface, making it suitable for scenarios with appearance requirements, such as the connection of medical device casings and visible components of high-end electronic equipment. Phosphating treatment can improve the friction between the washer and the connected part; when used with bolts, it can enhance the anti-loosening effect. Especially in environments with frequent vibrations (such as automobile chassis and motor casings), the phosphated Small Flat Washer GB848 can effectively prevent bolts from loosening due to vibration. For scenarios requiring insulation, an insulating coating (such as epoxy resin) is sprayed on the washer surface to avoid the risk of circuit short circuits caused by the conductivity of metal washers, which is suitable for the connection of high-voltage components inside electronic equipment.
In practical applications, the Small Flat Washer GB848 can be found in various industries. In the machinery manufacturing field, it is often used with hexagon socket bolts to fix the sliders of machine tool guide rails. The guide rail sliders are mostly made of cast iron and have high surface precision requirements. The Small Flat Washer GB848 can disperse bolt pressure, avoid indentations on the guide rail surface, and ensure the smooth sliding of the sliders. In the electronic equipment field, the connection between the middle frame and screen components of smartphones, and the fixing of keyboard brackets of laptops, all rely on the assistance of the Small Flat Washer GB848. Its small-size design can adapt to the compact space inside the equipment while protecting fragile plastic and glass components. In the automotive industry, the fixing of sensors in the engine compartment and the assembly of door trim panels also depend on the Small Flat Washer GB848 to disperse pressure and prevent components from being damaged due to long-term vibration.
Although the Small Flat Washer GB848 is small in size and simple in structure, it has become an indispensable part of the industrial fastening system, with GB standards as the "scale" and precise functions as the "core". It uses "buffering" power to resolve potential risks during the fastening process and ensures the efficient operation of the supply chain with standardized quality. As manufacturing industries continue to raise requirements for product precision and reliability, the Small Flat Washer GB848 will play a role in more segmented scenarios, supporting the stable operation of the "large industry" with the power of a "small component".
