How to consider the thread rotation direction in the design of automobile wheel and spindle hub disk?

In this case, the consideration of thread rotation direction includes: the definition of rotation direction, compactness and safety.

1. Definition of rotation direction: there are left-handed and right-handed threads. Left-handed thread refers to fastening when rotating counterclockwise, and right-handed thread refers to fastening when rotating clockwise. When designing, it is necessary to specify the required rotation direction to ensure that the threads of all connecting parts rotate in the same direction.

2. Tightness: The tightness can be increased by using proper rotation direction in the connecting part. Left-handed thread and right-handed thread have different fastening effects. For example, when using left-handed threaded connection, counterclockwise rotation will become tighter and tighter, providing better fastening effect.

3. Safety: In some applications, a specific rotation direction may be safer. For example, in some potentially dangerous places, such as coal mines or chemical industries, using left-handed threads for connection can prevent accidental loosening.