style="font-size:16px;">Importance of Anti-Loosening for Imported screws
Imported screws are widely used in scenarios with extremely high requirements for precision and reliability. Take aircraft engines as an example: a large number of imported high-strength screws are used to fix key components inside. If these screws loosen under the severe vibration generated by the engine's high-speed operation, flight safety will be directly threatened. In semiconductor manufacturing equipment, loosening of imported screws may cause displacement of precision components, affecting product processing accuracy and resulting in significant economic losses. Effective anti-loosening measures can ensure that imported screws remain tightly fastened under complex working conditions, maintain the normal operation and stable performance of equipment, and reduce maintenance costs and safety risks caused by screw loosening.
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Spring Washers: Spring washers are a common and economical anti-loosening method. They utilize the elastic deformation of the washer to generate continuous axial pressure on the nut and the connected component after the screw is tightened, increasing friction between the thread pairs to prevent nut loosening. Some imported spring washers are manufactured using special materials and processes, such as stainless steel with high-precision stamping technology, which ensures elasticity while enhancing corrosion resistance and fatigue life.
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Nylon Insert Nuts: Nylon insert nuts achieve anti-loosening by embedding a nylon ring in the nut body. When the nut is tightened, the nylon ring is squeezed and deformed, tightly wrapping the bolt to generate radial pressure and increase friction between threads. Nylon insert nuts from some imported brands use high-temperature-resistant and wear-resistant special nylon materials, allowing them to maintain good anti-loosening effects in high-temperature and high-vibration environments.
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Cotter Pins with Slotted Nuts: After tightening the slotted nut on the bolt, a hole is drilled at the end of the bolt, and a cotter pin is inserted and its tail is bent to form a mechanical lock between the nut and the bolt. This method is often used in occasions with extremely high anti-loosening requirements, such as connections for key components of imported heavy machinery and ships. Imported cotter pins and slotted nuts have advantages in material quality and manufacturing precision—for example, they are made of high-strength alloy steel to ensure they do not break or fail under harsh working conditions.
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lock washers: lock washers fix nuts or bolts to connected components through specific structural designs. Common types include single-ear lock washers and double-ear lock washers. During installation, the ears of the washer are bent to fit the edges of the nut or connected component, restricting the rotation of the nut. Imported lock washers excel in material strength and anti-fatigue performance, enabling them to adapt to long-term, high-frequency vibration environments.
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Welding: For some imported screw connections that no longer require disassembly, welding can be used for permanent anti-loosening. Welding the nut and bolt together to form an integrated unit completely eliminates the possibility of loosening. In certain specific parts of imported equipment, such as the fixed base of industrial robots, this method is adopted to ensure absolute connection stability.
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Thread Locking Adhesive: Applying thread locking adhesive to the thread surface, after curing, can firmly bond the thread pairs together. Imported thread locking adhesives are superior in performance, featuring high strength, chemical resistance, and resistance to high and low temperatures. They can achieve reliable anti-loosening effects in various complex environments and are available in detachable and non-detachable types to meet different usage needs.
In the field of anti-loosening for imported screws, there are a series of strict international technical standards and certification systems. For example, the German Industrial Standard (DIN) specifies detailed requirements for the anti-loosening performance and material requirements of screws; the American Society of Mechanical Engineers (ASME) has also formulated relevant standards to ensure the anti-loosening reliability of screws under various working conditions. In addition, certifications such as ISO 9001 Quality Management System and ISO 14001 Environmental Management System indirectly reflect the capabilities and levels of imported screw manufacturers in anti-loosening technology research and development, production process control, etc. Imported screws that comply with these standards and obtain relevant certifications are more guaranteed in terms of anti-loosening performance and quality.
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JIALI FASTENER