Bolts are manufactured according to GB897-GB901 standards and are made from materials such as Q235, 45#, 40Cr, 35CrMoA, and Q345D. Available sizes range from M3mm to M100mm, with lengths customizable to meet customer needs.

In actual operation, factors such as vibration, fluctuation, and high-temperature creep of materials can reduce friction, causing the normal pressure in the thread pair to disappear momentarily, resulting in zero friction. This can lead to loosening of the threaded connections, and with repeated action, the connections can become loose and fail. Therefore, anti-loosening measures must be implemented to prevent this, as it can affect normal operation and cause accidents.