How do Auto Parts Screws ensure long-term stability and anti-loosening performance?

It is very important to ensure the long-term stability and anti-loosening performance of Auto Parts Screws, because the loosening or failure of screws may cause serious safety hazards. The following are several common methods and techniques that can effectively improve the long-term stability and anti-loosening performance of screws:

1. Screw material selection
High-strength materials: Select screw materials with high tensile strength and corrosion resistance, such as stainless steel, titanium alloy, etc. These materials can not only withstand high loads, but also resist erosion from the external environment (such as moisture, salt spray, chemicals, etc.).

High-temperature resistant materials: For parts that need to withstand high temperatures (such as engine parts), screw materials that can withstand high temperatures, such as high-temperature alloy materials, should be selected.

2. Thread design
Improve thread design: The thread design of the screw directly affects its fastening performance. The use of double thread, fine thread and other designs can increase the locking force of the screw and reduce the risk of loosening.

Surface treatment: The use of hardening treatment or coating (such as galvanizing, phosphating, etc.) can increase the friction of the thread and increase the anti-loosening ability.

3. Locking technology
Locking nut (such as nylon locking nut): There is a nylon ring inside the nylon locking nut. When the thread is tightened, the nylon ring will generate friction, increase the locking force and prevent loosening. Suitable for high vibration environment.

Screw self-locking technology: Some screws use built-in self-locking devices, such as locking washers or self-locking nuts, which can effectively prevent the screws from loosening due to vibration or load changes after long-term use.

Double locking system: By adding a combination of locking washers, nuts or spring washers between the two contact surfaces of the screw, the anti-loosening ability is further enhanced.

4. Anti-loosening coating and chemical agents
Thread locking agent (such as thread glue): Applying a special locking agent to the thread can form a strong protective film to prevent the screw from loosening. This method is particularly effective in high vibration or high temperature environments.

Dry film coating: Anti-loosening coating (such as fluoride coating) used on the surface of the screw can reduce friction and prevent loosening due to insufficient friction.

5. Tightening torque control
Precise torque control: Use torque tools (such as electronic wrenches) to accurately control the tightening torque of the screws to ensure that the screws reach the correct tightening state. Excessive torque can cause damage to the thread or breakage of the screws, while too little torque may cause loosening.

Tightening sequence optimization: For parts connected by multiple screws, a reasonable tightening sequence can avoid stress concentration caused by uneven tightening, thereby improving the stability of the screws.

6. Vibration control
Shock absorption design: By designing shock absorption components such as spring washers and rubber washers, the impact of vibration on the screws during vehicle driving can be effectively reduced, reducing the possibility of loosening.

Avoid stress concentration: When designing, avoid stress concentration around the screws, such as designing sufficient support surfaces and avoiding over-tightening.

7. Regular inspection and maintenance
Regular inspection and preventive maintenance: For parts that are susceptible to vibration and thermal deformation, it is necessary to regularly check the tightening state of the screws. By promptly detecting loose screws and re-tightening them, their service life can be effectively extended.

Use smart sensors: Some high-end cars have begun to use smart sensors to monitor the status of screws in real time and detect whether they are loose or damaged.

8. Reasonable installation location and environment
Optimize the installation location: Ensure that the installation location of the screws will not be subject to excessive external forces to reduce unnecessary vibration and stress.

Use high-temperature resistant and corrosion-resistant screw materials: For screws exposed to extreme environments (such as engine parts), using more high-temperature resistant and corrosion-resistant materials can improve their stability and resistance to loosening.

Through the combination of the above methods, it is possible to effectively ensure that the screws of automotive parts remain stable during long-term use and reduce the risk of loosening, thereby improving the safety and durability of the car.