- ZHUHAI JIALI HARDWARE CO.,LTD.
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Hexagon socket three combination screw DIN912 with cylindrical head
- Product description：A hexagon screw is equipped with a spring pad and a flat pad, and three fasteners are combined to form a new component.
In fields such as mechanical manufacturing, electronic equipment, and furniture assembly, fasteners are the "invisible heroes" that connect components and ensure structural stability. Among them, the cylindrical-head hexagon socket triple-combo screw has become a preferred solution for numerous scenarios due to its unique structural design and user-friendly experience. It is not a single part, but an integrated component precisely composed of one cylindrical-head hexagon socket screw, one elastic washer (referred to as "spring washer" for short), and one flat washer (referred to as "flat washer" for short). These three parts work in synergy, which not only simplifies the assembly process but also significantly enhances fastening reliability, making it worthy of being called the "golden partner" in the field of fasteners.
From the perspective of structural composition, each part of the cylindrical-head hexagon socket triple-combo screw has an irreplaceable function. As the core component, the cylindrical-head hexagon socket screw features a cylindrical head with a hexagon socket groove on the top. Compared with traditional external hexagon screws, the hexagon socket design not only offers better aesthetics but also enables more stable torque transmission in limited spaces. It is particularly suitable for scenarios requiring concealed installation or frequent disassembly — operation can be easily completed with a hexagon socket wrench, avoiding the issue that external hexagon wrenches cannot exert force due to space constraints. The shank of the screw is equipped with precision threads, which can accurately engage with the threaded holes of the connected components, providing basic tension for the entire connection structure.
The matching flat washer may seem simple, but it is actually a "protective shield" for the connected components. Usually made of metal, it has a ring-shaped thin sheet structure and is sleeved between the screw shank and the connected component. Its core function is to increase the contact area between the screw and the connected component: on one hand, it prevents the screw head from directly pressing the surface of the connected component, avoiding indentations, deformation, or even cracking of connected components made of soft materials such as plastic and wood; on the other hand, it can disperse the pressure during fastening, allowing the force to be transmitted more evenly to the connected component, reducing local stress concentration and prolonging the service life of the component.
The addition of the spring washer adds a "loosening-prevention insurance" to the fastening structure. Generally made of spring steel, the spring washer has excellent elasticity and toughness, with a wavy or serrated structure. When the screw is tightened, the spring washer is squeezed and undergoes elastic deformation. This deformation continuously exerts a reverse elastic force on the screw, offsetting the tendency of the screw to loosen caused by factors such as vibration and temperature changes. In equipment that operates in vibrating environments for a long time, such as motors, water pumps, and automobile parts, the loosening-prevention effect of the spring washer is particularly crucial. It can effectively avoid equipment failures or even safety hazards caused by loose screws.
Compared with the traditional method of purchasing screws, spring washers, and flat washers separately and assembling them one by one, the advantages of the cylindrical-head hexagon socket triple-combo screw are obvious. Firstly, it improves assembly efficiency. The traditional method requires workers to pick and place three types of parts separately and adjust their positions to ensure alignment, which wastes a lot of time, especially in mass production. However, the triple-combo screw is pre-assembled into an integrated unit before leaving the factory. Workers only need to pick it up once and tighten it once to complete the assembly. Statistics show that this can increase assembly efficiency by more than 30%, significantly reducing the labor costs of enterprises. Secondly, it ensures assembly quality. During separate assembly, if workers operate improperly (such as missing the spring washer or misaligning the flat washer), the fastening effect will be greatly reduced. The standardized assembly of the triple-combo screw ensures that each component meets the specifications, avoiding quality problems caused by human errors. In addition, it also reduces inventory management pressure — enterprises do not need to stock three types of parts separately; instead, they only need to purchase the combo screws according to demand, reducing the risk of inventory overstock and warehousing costs.
In terms of application scenarios, the cylindrical-head hexagon socket triple-combo screw has strong versatility. In the field of electronic equipment, it is often used to fix the casings of products such as computer hosts and routers. The hexagon socket design prevents the screw head from protruding and affecting the appearance of the equipment, while the flat washer and spring washer can protect the precision circuit board from extrusion. In furniture manufacturing, this type of screw is commonly used as a connector for solid wood wardrobes and desks. The loosening-prevention property of the spring washer can prevent the furniture from loosening and making abnormal noises after long-term use. In the field of mechanical manufacturing, it is indispensable for fixing the end covers of small motors and water pumps, as it can maintain structural stability in vibrating environments.
However, to give full play to the performance of the cylindrical-head hexagon socket triple-combo screw, attention should be paid to the details of selection and installation. During selection, it is necessary to choose the appropriate specifications and materials based on the material of the connected components and force requirements — for example, stainless steel is suitable for humid environments, while carbon steel is applicable to scenarios with large force loads. At the same time, check the integrity of the combo unit to ensure that the spring washer and flat washer are not deformed and the screw threads are not damaged. During installation, a hexagon socket wrench of matching specifications must be used to avoid slipping of the screw head due to mismatched wrench size. When tightening, the torque should be properly controlled: excessive tightening may cause the spring washer to lose elasticity, which instead affects the loosening-prevention effect; insufficient torque cannot guarantee fastening reliability.
From separate parts to an integrated combo unit, the design innovation of the cylindrical-head hexagon socket triple-combo screw not only meets the demand for efficient assembly in modern manufacturing but also takes into account the stability and safety of the fastening structure. In today's pursuit of refined and efficient production, it is not just a type of fastener, but also a vivid embodiment of the concept that "details determine quality" in industrial production, continuously safeguarding the product quality in various fields.