Material: 304/316/201 stainless steel

Regarding the sizes: I uploaded an infographic of all the sizes, selecting the corresponding size will jump to the corresponding size information .

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Practical application:

Automobile Manufacturing: In automobiles, tricycles, electric vehicles and other vehicles, cap nuts are used for fixing tyres and front and rear axles to ensure the safety and reliability of the vehicles.
Machinery Manufacturing: In the assembly and maintenance of machines and equipment, cap nuts help to ensure the normal operation of the equipment.
Construction: In the construction industry, cap nuts are used for the fastening of various structural components, providing a solid connection.
Electronics: In the manufacture and assembly of electronic equipment, cap nuts protect electronic components by preventing the ingress of moisture and other corrosive substances.
Aerospace: In the aerospace industry, cap nuts are also widely used due to the high sealing and reliability requirements of fasteners.
Pros:

Sealing: Cap nuts are designed to provide a better seal to prevent debris from entering the connection area, which is critical to protecting internal components and extending the life of the connection.
Self-locking: Some cap nut designs are self-locking, meaning they can remain tight without additional locking devices, which is especially useful in vibrating environments.
Ease of installation: The design of cap nuts makes them easy to install and quick to fasten, even when space is at a premium.
Rust protection: thanks to their special construction, cap nuts prevent moisture and other corrosive substances from entering the threaded holes, thus increasing the corrosion resistance of both themselves and their connections.